imagestringup

imagesettile

Last updated: Fri, 19 Jun 2009

imagestring

(PHP 4, PHP 5)

imagestring — Dibujar una cadena horizontalmente

Descripción

bool imagestring ( resource $imagen , int $fuente , int $x , int $y , string $cadena , int $color )

Dibuja una cadena en las coordenadas dadas.

Lista de parámetros

image: An image resource, returned by one of the image creation functions, such as imagecreatetruecolor().
font: Can be 1, 2, 3, 4, 5 for built-in fonts in latin2 encoding (where higher numbers corresponding to larger fonts) or any of your own font identifiers registered with imageloadfont().
x: coordenada x de la esquina superior izquierda
y: coordenada y de la esquina superior izquierda
cadena: La cadena a escribir
color: Un identificador de color creado con imagecolorallocate()

Valores retornados

Devuelve TRUE si todo se llevó a cabo correctamente, FALSE en caso de fallo.

Ejemplos

Example #1 Ejemplo de imagestring()


<?php
// crear una imagen 100*30
$im = imagecreate(100, 30);

// fondo blanco y texto azul
$fondo = imagecolorallocate($im, 255, 255, 255);
$color_texto = imagecolorallocate($im, 0, 0, 255);

// escribir la cadena arriba a la izquierda
imagestring($im, 5, 0, 0, "¡Hola mundo!", $color_texto);

// producir la salida de la imagen
header("Content-type: image/png");
imagepng($im);
?>

El resultado del ejemplo seria algo similar a:

Ver también

imageloadfont() - Cargar una fuente nueva
imagettftext() - Escribir un texto sobre la imagen usando fuentes TrueType

imagestringup

imagesettile

Last updated: Fri, 19 Jun 2009

add a note User Contributed Notes
imagestring

user24
26-May-2009 01:01


ImageStringRight code:

<?php



function ImageStringRight($image, $font, $y, $str, $col,$r_padding=1, $ImageString = 'ImageString') {

    // http://www.puremango.co.uk/2009/04/php-imagestringright-center-italic/



    $font_width = ImageFontWidth($font);

    $str_width = strlen($str)*$font_width;

    if(!function_exists($ImageString) || $ImageString==__FUNCTION__) {

        // don't allow recursion

        $ImageString = 'ImageString';

    }

    $ImageString($image, $font, ImageSX($image)-$str_width-$r_padding, $y, $str, $col);

}



?>



ImageStringUnderlined code:

<?php

function ImageStringUnderlined($image, $font, $x, $y, $str, $col, $ImageString = 'ImageString') {

    // http://www.puremango.co.uk/2009/04/php-imagestringright-center-italic/

    

    $font_width = ImageFontWidth($font);

    $font_height = ImageFontHeight($font);

    $str_width = strlen($str)*$font_width;

    if(!function_exists($ImageString) || $ImageString==__FUNCTION__) {

        // don't allow recursion

        $ImageString = 'ImageString';

    }

    $ImageString($image, $font, $x, $y, $str, $col);

    ImageLine($image, $x, $y+$font_height, $x+$str_width, $y+$font_height, $col);

}

?>



ImageStringItalic and a dropshadow version along with usage, demo and other imageString functions at http://www.puremango.co.uk/2009/04/php-imagestringright-center-italic/

eric dot brison at anakeen dot com
24-Apr-2009 07:51


Same function as above but it can display multi-line strings.

<?php

function sendimagetext($text) {

  // Set font size

  $font_size = 4;



  $ts=explode("\n",$text);

  $width=0;

  foreach ($ts as $k=>$string) { //compute width

    $width=max($width,strlen($string));

  }



  // Create image width dependant on width of the string

  $width  = imagefontwidth($font_size)*$width;

  // Set height to that of the font

  $height = imagefontheight($font_size)*count($ts);

  $el=imagefontheight($font_size);

  $em=imagefontwidth($font_size);

  // Create the image pallette

  $img = imagecreatetruecolor($width,$height);

  // Dark red background

  $bg = imagecolorallocate($img, 0xAA, 0x00, 0x00);

  imagefilledrectangle($img, 0, 0,$width ,$height , $bg);

  // White font color

  $color = imagecolorallocate($img, 255, 255, 255);



  foreach ($ts as $k=>$string) {

    // Length of the string

    $len = strlen($string);

    // Y-coordinate of character, X changes, Y is static

    $ypos = 0;

    // Loop through the string

    for($i=0;$i<$len;$i++){

      // Position of the character horizontally

      $xpos = $i * $em;

      $ypos = $k * $el;

      // Draw character

      imagechar($img, $font_size, $xpos, $ypos, $string, $color);

      // Remove character from string

      $string = substr($string, 1);      

    }

  }

  // Return the image

  header("Content-Type: image/png");

  imagepng($img);

  // Remove image

  imagedestroy($img);

}

?>

mike at mike-griffiths dot co dot uk
19-Dec-2008 08:07


I created an alternative using the function imagechar to create a string of an image.  The below function below was used to create an image the same height and width of the text string.  It is used on my website (http://www.beatspot.co.uk) to mask users email addresses.



<?PHP



// Set your string somehow

$string = 'your@email.com';



// Set font size

$font_size = 4;



// Create image width dependant on width of the string

$width  = imagefontwidth($font_size)*strlen($string);

// Set height to that of the font

$height = imagefontheight($font_size);

// Create the image pallette

$img = imagecreate($width,$height);

// Grey background

$bg    = imagecolorallocate($img, 25, 25, 25);

// White font color

$color = imagecolorallocate($img, 255, 255, 255);

// Length of the string

$len = strlen($string);

// Y-coordinate of character, X changes, Y is static

$ypos = 0;

// Loop through the string

for($i=0;$i<$len;$i++){

    // Position of the character horizontally

    $xpos = $i * imagefontwidth($font_size);

    // Draw character

    imagechar($img, $font_size, $xpos, $ypos, $string, $color);

    // Remove character from string

    $string = substr($string, 1);    

    

}

// Return the image

header("Content-Type: image/gif");

imagegif($img);

// Remove image 

imagedestroy($img);



?>

keksnicoh at googlemail dot com
02-Nov-2008 06:42


Some fun with imagestring:



This function is a product of too much time..

It opens an image and create a new image with one letter instead of a pixel.



<?php

error_reporting(E_ALL);

/**

 * generates a image with chars instead of pixels

 *

 * @param string $url Filepath or url

 * @param string $chars The chars which should replace the pixels

 * @param int $shrpns Sharpness (2 = every second pixel, 1 = every pixel ... )

 * @param int $size 

 * @param int $weight font-weight/size

 * @return sesource

 * @author Nicolas 'KeksNicoh' Heimann <www.salamipla.net>

 * @date 02nov08

 */

function pixelfuck($url, $chars='ewk34543§G§$§$Tg34g4g', $shrpns=1, $size=4,$weight=2)

{

    list($w, $h, $type) = getimagesize($url);

    $resource = imagecreatefromstring(file_get_contents($url));

    $img = imagecreatetruecolor($w*$size,$h*$size);



    $cc = strlen($chars);

    for($y=0;$y <$h;$y+=$shrpns) 

        for($x=0;$x <$w;$x+=$shrpns)

            imagestring($img,$weight,$x*$size,$y*$size, $chars{@++$p%$cc}, imagecolorat($resource, $x, $y));

    return $img;

}



$url = 'http://upload.wikimedia.org/wikipedia/commons/b/be/Manga_Icon.png';

$text = 'I-dont-like-manga-...-Why-do-they-have-such-big-eyes? Strange-...-WHAT-WANT-YOU-DO?';



Header('Content-Type: image/png');

imagepng(pixelfuck($url, $text, 1, 6));

?>



Have fun  :)

Abubaker dot shamlan at gmail dot com
19-Aug-2008 10:02


this is a function that is based on imagestring but it produces text in the center of an image i hope it helps :D





<?php


function ImageStringCenter($image_resource, $font_size, $line_number, $total_lines, $text, $color ) {





    $center_x = ceil( ( imagesx($image_resource) - ( ImageFontWidth($font_size) * strlen($text) ) ) / 2 );





    $center_y = ceil( ( ( imagesy($image_resource) - ( ImageFontHeight($font_size) * $total_lines ) ) / 2)  + ( ($line_number-1) * ImageFontHeight($font_size) ) );





ImageString($image_resource, $font_size, $center_x, $center_y, $text, $color );





}


?>

mustafa at hafunny dot info
14-Aug-2008 09:42


If you have any problem with CentralEurope's words, for example : ľščťžýáíéúäňôď, I am try this problem by iconv() function.



<?php

// create example image

$im = imagecreate(200, 20);

$bg = imagecolorallocate($im, 255, 255, 255);

$textcolor = imagecolorallocate($im, 0, 0, 255);

$text = "ľščťžýáíéúäňôď...";



//simple convert string

$string = iconv("Windows-1250", "Latin2", $text);



// write converted string at the top left

imagestring($im, 4, 0, 0, $string, $textcolor);



// output the image

header("Content-type: image/png");

imagepng($im);

?>

sk89q
14-Mar-2008 10:10


Creates a box of text. Has horizontal and vertical alignment, box arguments, and custom leading. I submitted this to the manual in 2003 actually, but it disappeared after a year or so (not sure why). Here it is again.



<?php

define("ALIGN_LEFT", "left");

define("ALIGN_CENTER", "center");

define("ALIGN_RIGHT", "right");

define("VALIGN_TOP", "top");

define("VALIGN_MIDDLE", "middle");

define("VALIGN_BOTTOM", "bottom");



function imagestringbox(&$image, $font, $left, $top, $right, $bottom, $align, $valign, $leading, $text, $color)

{

   // Get size of box

   $height = $bottom - $top;

   $width = $right - $left;

  

   // Break the text into lines, and into an array

   $lines = wordwrap($text, floor($width / imagefontwidth($font)), "\n", true);

   $lines = explode("\n", $lines);

  

   // Other important numbers

   $line_height = imagefontheight($font) + $leading;

   $line_count = floor($height / $line_height);

   $line_count = ($line_count > count($lines)) ? (count($lines)) : ($line_count);

  

   // Loop through lines

   for ($i = 0; $i < $line_count; $i++)

   {

       // Vertical Align

       switch($valign)

       {

           case VALIGN_TOP: // Top

               $y = $top + ($i * $line_height);

               break;

           case VALIGN_MIDDLE: // Middle

               $y = $top + (($height - ($line_count * $line_height)) / 2) + ($i * $line_height);

               break;

           case VALIGN_BOTTOM: // Bottom

               $y = ($top + $height) - ($line_count * $line_height) + ($i * $line_height);

               break;

           default:

               return false;

       }

      

       // Horizontal Align

       $line_width = strlen($lines[$i]) * imagefontwidth($font);

       switch($align)

       {

           case ALIGN_LEFT: // Left

               $x = $left;

               break;

           case ALIGN_CENTER: // Center

               $x = $left + (($width - $line_width) / 2);

               break;

           case ALIGN_RIGHT: // Right

               $x = $left + ($width - $line_width);

               break;

           default:

               return false;

       }

      

       // Draw

       imagestring($image, $font, $x, $y, $lines[$i], $color);

   }

  

   return true;

}

?>

Anonymous
30-Jan-2008 05:31


<?php



header("Content-type: image/png");

$string = $_GET['text'];

$im     = imagecreatefrompng("button1.png");

$color = imagecolorallocate($im, 0, 0, 0);

$px     = (imagesx($im) - 7.5 * strlen($string)) / 2;

imagestring($im, 3, $px, 9, $string, $color);

imagepng($im);

imagedestroy($im);



?> 



this code you can write the string within the url by a $_get function

Tobias
17-Jan-2008 09:40


I've taken the code of Epidemiah and improved the code so that the function now can handle generic position commands (as e.g. left / bottom) or int-values as left/top position of the text to write (with positive values used as left/top position and negative from right/bottom).



So e.g. imageWriteString($img, $font, $text, $color, -10,-10); writes the text so that there is 10 px space to right and bottom border of image.



Hope this is useful. Could be optimized and checked in detail, but works fine for me.



Tobias



<?php



/**

 * write text at a specified position of the image

 * @source: http://de.php.net/manual/en/function.imagestring.php#80186

 *

 * @param &$img; reference to image

 * @param $font font to use

 * @param $text text to write

 * @param $color color to use

 * @param $position_x var if numeric: write starting at position x (if x >= 0), otherwise from right border; possible string values: left(5px from left border), right(5px from right border), center(default)

 * @param $position_y var if numeric: write starting at position y (if y >= 0), otherwise from bottom; possible string values: top(5px from top border), bottom(5px from bottom border), center(default)

 * @return void

 */

function imageWriteString(&$img, $font, $text, $color, $position_x = 'center', $position_y = 'center') {

    // initialize internal variables

    $x = null;

    $y = null;



    if($font < 0 || $font > 5){ $font = 0; }

    $num = array(array(4.6, 6),

                 array(4.6, 6),

                 array(5.6, 12),

                 array(6.5, 12),

                 array(7.6, 16),

                 array(8.5, 16));



    $width = ceil(strlen($text) * $num[$font][0]);

    $height = $num[$font][1] + 2;



    // handle position x

    if (is_string($position_x)) {

        switch($position_x) {

            case 'left':

                $position_x = 5;

                break;

            case 'right':

                $position_x = -5;

                break;

            default:

            case 'center':

                $x     = (imagesx($img) - $width - 8) / 2;

                break;

        }

    }

    if (!isset($x)) {

        if(is_numeric($position_x)) {

            if ($position_x >= 0) {

                $x = $position_x; // left

            } else {

                $x = imagesx($img) - $width + $position_x - 8; // right

            }

        } else {

            $x     = (imagesx($img) - $width - 8) / 2; // default / error value: center

        }

    }



    // handle position y

    if (is_string($position_y)) {

        switch($position_y) {

            case 'top':

                $position_y = 5;

                break;

            case 'bottom':

                $position_y = -5;

                break;

            default:

            case 'center':

                $y     = (Imagesy($img) - ($num[$font][1] + 2))/2;

                break;

        }

    }

    if (!isset($y)) {

        if (is_numeric($position_y)) {

            if ($position_y >= 0) {

                $y = $position_y; // top

            } else {

                $y = Imagesy($img) - $height + $position_y; // bottom

            }

        } else {

            $y     = (Imagesy($img) - ($num[$font][1] + 2))/2; // default / error value: center

        }

    }

    imagestring($img, $font, $x, $y, $text, $color);

}

?>

eviloverlord+php at gmail dot com
03-Jan-2008 11:28


Simple script to convert a string (such as an email addresses) to a transparent image.



Usage: 

<img src="stringtoimg.php?string=<?= urlencode(base64_encode($email)) ?>">



From a spambot's point of view, they see:

<img src="stringtoimg.php?string=ZpbXZG92ZXJsb3JkQGdtYWlsLmNvbQ%3D%3D">



Optional parameters:

    font_size: 1 to 5, with the default at 3

    R/G/B: the font color, in hex.



Usage:

<img src="stringtoimg.php?string=<?= urlencode(base64_encode($email)) ?>&font_size=4&R=FF&G=FF&B=00">



<?php

/*

Filename: stringtoimg.php



Parameters:

        string: the string to print

        font_size (optional): the size of the font from 1-5

        R/G/B (optional): the RGB colors of the font in hex       

*/



header ("Content-type: image/png");



//Get string info

$font_size = isset($_GET['font_size']) ? $_GET['font_size'] : 3;

$string = urldecode(base64_decode($_GET['string']));



//Get the size of the string

$width = imagefontwidth($font_size) * strlen($string);

$height = imagefontheight($font_size);



//Create the image

$img = @imagecreatetruecolor($width, $height)

      or die("Cannot Initialize new GD image stream");



//Make it transparent

imagesavealpha($img, true);

$trans_colour = imagecolorallocatealpha($img, 0, 0, 0, 127);

imagefill($img, 0, 0, $trans_colour);



//Get the text color

$text_color = isset($_GET['R'], $_GET['G'], $_GET['B']) ?

        imagecolorallocate($img, hexdec($_GET['R']), hexdec($_GET['G']), hexdec($_GET['B'])) :

        imagecolorallocate($img, 0, 0, 0);



//Draw the string

imagestring($img, $font_size, 0, 0,  $string, $text_color);



//Output the image

imagepng($img);

imagedestroy($img);

?>

Epidemiah
03-Jan-2008 01:06


Its just an easy function to write an string in the middle of a picture.



<?php



function imageCenterString(&$img, $font, $text, $color)

{

    if($font < 0 || $font > 5){ $font = 0; }

    $num = array(array(4.6, 6),

                 array(4.6, 6),

                 array(5.6, 12),

                 array(6.5, 12),

                 array(7.6, 16),

                 array(8.5, 16));

    $width = ceil(strlen($text) * $num[$font][0]);

    $x     = imagesx($img) - $width - 8;

    $y     = Imagesy($img) - ($num[$font][1] + 2);

    imagestring($img, $font, $x/2, $y/2, $text, $color);

}



?>

jlamer
19-Feb-2007 02:00


//  Example of use...



//  This is a simple function to output text to an image

//  which is centered (as much as I want to do by eye)

//  and wrapped

//    Just remember that all the sizes are guessed

// doesn't cut on the space (only on number of characters)

//  or change color of text, but this isn't for that...

function imageCenterString( $imgw, $imgh,

   $image_text = '', $text_size=5 )

{

   $im = imagecreate( $imgw, $imgh );

    

   // white background and blue text

   $bg = imagecolorallocate($im, 255, 255, 255);

   $textcolor = imagecolorallocate($im, 0, 0, 0);

    

   $t_h = $t_w = $t_x = $t_y = 0;

   $base_w =9; $base_h = 16;

   $m = 0.88;

   switch ( $text_size )

   {

      case 1: $t_w = $base_w*pow(($m*.98),4);

         $t_h = $base_h*pow(($m*.98),4);

         break;

      case 2: $t_w = $base_w*pow($m,3);

         $t_h = $base_h*pow($m,3);

         break;

      case 3: $t_w = $base_w*pow($m,2);

         $t_h = $base_h*pow($m,2);

         break;

      case 4: $t_w = $base_w*$m;

         $t_h = $base_h*$m;

         break;

      case 5: $t_w = $base_w;

         $t_h = $base_h;

         break;

      default:

         if ( $text_size >= 5 ) // set to 5

         {   $t_w = $base_w; $t_h = $base_h; }

         if ( $text_size < 5 ) // set to 1

         {

            $t_w = $base_w*pow(($m*.98),4);

            $t_h = $base_h*pow(($m*.98),4);

         }

         break;

   }

    

   $text_array = array();

    

   $max = floor($imgw/$t_w);

    

   for( $i=0; strlen($image_text) > 0; $i += $max)

   {

      array_push($text_array, substr($image_text,0,$max));

      if ( strlen($image_text) >= $max )

      {   $image_text = substr($image_text,$max); }

      else

      {   $image_text = ''; }

   }

    

   $t_y = ($imgh/2) - ($t_h*count($text_array)/2);



   foreach ( $text_array as $text )

   {

      $t_x = ($imgw/2)-($t_w*strlen($text)/2);

      imagestring($im, $text_size, $t_x, $t_y,

         $text, $textcolor);

      $t_y += $t_h;

   }



   // output the image

   header("Content-type: image/gpeg");

   imagejpeg($im);

}

gannon (at) portablesofdoom (dot) org
28-Dec-2006 02:53


I like this better than "tjpoe at cableaz dot com"'s function for wrapping text to fit width (auto-adjusts height as needed) since it doesn't only do 1 word per line.



function make_wrapped_txt($txt, $color=000000, $space=4, $font=4, $w=300) {

  if (strlen($color) != 6) $color = 000000;

  $int = hexdec($color);

  $h = imagefontheight($font);

  $fw = imagefontwidth($font);

  $txt = explode("\n", wordwrap($txt, ($w / $fw), "\n"));

  $lines = count($txt);

  $im = imagecreate($w, (($h * $lines) + ($lines * $space)));

  $bg = imagecolorallocate($im, 255, 255, 255);

  $color = imagecolorallocate($im, 0xFF & ($int >> 0x10), 0xFF & ($int >> 0x8), 0xFF & $int);

  $y = 0;

  foreach ($txt as $text) {

    $x = (($w - ($fw * strlen($text))) / 2);

    imagestring($im, $font, $x, $y, $text, $color);

    $y += ($h + $space);

  }

  header('Content-type: image/jpeg');

  die(imagejpeg($im));

}

iibm at free dot fr
14-Dec-2006 10:21


I've made a little modification of the (quite usefull) imagestringcutted function (when align=center, it doesn't work well for me if x1!=0) so juste replace the last line with :



<?php

   [...]

   else imagestring($img,$font,$x1+($x2-$x1)/ 2 - strlen($text) * $fontwidth / 2,$y,$text,$color);

}

?>

Piotr dot Sulecki at traxelektronik dot pl
09-Nov-2006 11:18


The built-in fonts used to be in latin-2 (iso8859-2) encoding. For some time, they are in latin-1 (iso8859-1) encoding. There is no way to change the encoding at all. If you need to use any other encoding, you have to use TrueType fonts.

god at in-heaven dot org
18-Oct-2006 09:47


Here's a simple function for creating an aligned string which is cutted to match the space between $x1 and $x2

<?php

function imagestringcutted($img,$font,$y,$x1,$x2,$text,$color,$align="center") {

    $fontwidth = imagefontwidth($font);

    $fullwidth = strlen($text) * $fontwidth;

    $maxwidth = $x2-$x1;

    $targetwidth = $fullwidth-(4*$fontwidth);

    if($fullwidth > $maxwidth) {

        for($i = 0; $i < strlen($text) AND ((strlen($text)-($i-4))*$fontwidth) > $targetwidth ;$i++) { }

        $text = substr($text,0,(strlen($text)-$i)-4)."...";

    }

    if($align == "left") imagestring($img,$font,$x1,$y,$text,$color);

    elseif($align == "right") imagestring($img,$font,$x2 - ((strlen($text) * $fontwidth)),$y,$text,$color);

    else imagestring($img,$font,($x2-$x1)/ 2 - strlen($text) * $fontwidth / 2,$y,$text,$color);

}

?>

Usage:

<?php

imagestringcutted($img,$font,$y,$x1,$x2,$text,$color,$align);

?>

Will create a string $text, which is cutted if it's too long to match between  $x1 and $2, on $img with font $font and color $color at height $y and with align to $align.

Hope it will help some people.

Sorry for my bad English.

rush at 507magazine dot com
28-Feb-2006 07:54


hello, I noticed that if you put a rand(3,5) it will put random sizes of font to each character put on the image. this is very useful when programming captchas for anti-spam form verification.

julien / at / theoconcept.com
01-Feb-2006 11:21


If you are looking for a way to generate a "CAPTCHA" image for a form verification (to verify it is not a robot), have a look at this : http://blog.theoconcept.com/static/distortion/



It gives an animated image with the parameter string, with distortion, here is an example :

http://blog.theoconcept.com/static/distortion/distortion.php



(*)  You'll need GD + Freetype support

(**) You'll need ImageMagick on the machine

m dot onderwater at esperantoxl dot nl
05-Dec-2005 06:55


There is a small error in the function for horizontal and vertical centering by "jurgen dot vanoosterwijck at pandora dot be"



the line 



 $cy = (imagesy($img)/2) - (imagefontwidth($font)/2);



should be



 $cy = (imagesy($img)/2) - (imagefontheight($font)/2);

aly at slo-igre dot net
11-Jun-2005 08:12


There is an error in "tjpoe at cableaz dot com" 's function ImageStringWrap. Instead of 



    else

           $string = $text;



there should be



     else

           $string = array($text);



for function to work for strings with only one word. Otherwise it works like a charm, thanks.

tjpoe at cableaz dot com
28-May-2005 02:48


i modified the centering functions and created this which centers each word on it's own line. You can adjust the spacing with the $valign var. currently no implimentation if text is too large for image. strings are tokenized by space, but can obviously be changed. 



function ImageStringWrap($image, $font, $text, $color)

{

  $fontwidth = ImageFontWidth($font);

  $fontheight = ImageFontHeight($font);

  $words= str_word_count($text);

  if ($words > 1){

    $string=array(strtok($text,' '));

    for ($i = 1 ; $i <= $words ; $i++){

      $string=array_merge($string,array($i=>strtok(' ')));

    }

  }

  else

    $string=$text;

  $vspace=4;

  $y=((imagesy($image)-($fontheight*$words)-($words*$vspace))/2);

  foreach($string as $st){

    $x=((imagesx($image)-($fontwidth * strlen($st)))/2);

    ImageString($image,$font,$x,$y,$st,$color);

    $y+=($fontheight+$vspace);

  }

}

hope this is helpful

bpgordon at gmail dot com
23-May-2005 11:04


This code produces a png image of the text within the query. It autofits to the length of the string. 

Usage: http://yoursite.com/text.php?abcdefg+hijk



Use + to produce a space in the image. The + can be excaped with a carat (^). Most other symbols work fine in the query string, like the ?.



<?php

header ("Content-type: image/png");

$string = $_ENV["QUERY_STRING"];

$md5 = md5($string); //just so we don't convert valid text into a +

$string = str_replace("^+", $md5, $string); //replaces ^+ with long, unnatural string

$string = str_replace("+", " ", $string); //replaces + with space

$string = str_replace($md5, "+", $string); //replaces the long, unnatural string with +

$width  = imagefontwidth($font) * strlen($string);

$height = imagefontheight($font);

$image = @imagecreate($width+2, $height+2);

$black = imagecolorallocate($image, 0, 0, 0); //background

$white = imagecolorallocate($image, 255, 255, 255);

imagestring($image, 2, 1, 1,  $string, $white);

imagepng($image);

imagedestroy($image);

?>

jurgen dot vanoosterwijck at pandora dot be
12-May-2005 05:52


Based on the previous example, here's how to center a string both horizontally and vertically...



<?php

function imagestringcentered ($img,$font,$text,$color) {

 while (strlen($text) * imagefontwidth($font) > imagesx($img)) {

  if ($font > 1) { $font--; }

  else { break; }

 } 

 $cy = (imagesy($img)/2) - (imagefontwidth($font)/2);

 imagestring($img,$font,imagesx($img) / 2 - strlen($text) * imagefontwidth($font) / 2,$cy,$text,$color);

}

?>

shadikka at gmail dot com
26-Mar-2005 07:49


My version of the centered string, it decreases the font number (since I've noticed smaller numbers are smaller fonts) until 1 if the string won't fit. Then it will give up.



<?php

function imagestringcentered ($img,$font,$cy,$text,$color) {

 while (strlen($text) * imagefontwidth($font) > imagesx($img)) {

  if ($font > 1) { $font--; }

  else { break; }

 }  

 imagestring($img,$font,imagesx($img) / 2 - strlen($text) * imagefontwidth($font) / 2,$cy,$text,$color);

}

?>

webmaster at acdrifter dot com
01-Mar-2005 04:08


If you are looking to center the text, use the following function; I'm not promising perfection...



function imagecenteredstring ( &$img, $font, $xMin, $xMax, $y, $str, $col ) {

    $textWidth = imagefontwidth( $font ) * strlen( $str );

    $xLoc = ( $xMax - $xMin - $textWidth ) / 2 + $xMin + $font;

    imagestring( $img, $font, $xLoc, $y, $str, $col );

}

cesargus at yahoo dot com
17-Nov-2004 06:27


//simple hello world



<?

header ("Content-type: image/png");



$img_handle = ImageCreate (200, 20) or die ("Cannot Create image");

$back_color = ImageColorAllocate ($img_handle, 0, 10, 10);

$txt_color = ImageColorAllocate ($img_handle, 235, 235, 51);

ImageString ($img_handle, 10, 25, 5,  "Hello world!", $txt_color);

ImagePng ($img_handle); 

?>

brooks dot boyd at gmail dot com
13-Oct-2004 07:35


Drawing a string as an image is a handy way to disguise an eMail address so spam sniffers can't get it as easily. The only catch to creating a dynamic image with your eMail in it is the eMail to be displayed must be passed via the query string to enable static HTML to use it. So, the eMail must be encrypted slightly in order to not defeat the purpose of not typing your eMail address outright. I wrote the following script to do so:



Save the following as email.php

<?php

    if ($_GET['addr'] != "") {

        $msg = $_GET['addr'];

        $msg = preg_replace("/\[dot]/",".",$msg);

        $msg = preg_replace("/\[at]/","@",$msg);

        $final = "";

        for ($i=0; $i<=strlen($msg); $i++) {

            $final .= substr($msg, strlen($msg)-$i, 1);

        }

        $msg = $final;



        $char_width = 8;

        $char_height = 17;

        $padding = 3;

        $width = $padding*2+strlen($msg)*$char_width;

        $height = +$padding*2+$char_height;

        $im = imagecreatetruecolor($width,$height);

        imagealphablending($im, FALSE);

        imagesavealpha($im, TRUE);

        $bg = imagecolorallocatealpha($im, 255, 255, 0, 100);

        $text = imagecolorallocatealpha($im, 0, 0, 0, 0);

        imagefilledrectangle ($im, 0, 0, $width, $height, $bg); # Make transparent

        imagestring($im, 4, $padding, $padding, $msg, $text);

    } else {

        $im = imagecreatetruecolor(1,1);

        imagealphablending($im, FALSE);

        imagesavealpha($im, TRUE);

        $bg = imagecolorallocatealpha($im, 255, 0, 0, 125);

        imagefilledrectangle ($im, 0, 0, 1, 1, $bg); # Make transparent

    }

    header('Content-type: image/jpg');

    imagepng($im);

    imagedestroy($im);



?>



If the script is called without an eMail address, it outputs a 2x2 transparent image.



To call the script to generate the eMail "user@home.com", the HTML tag would be:



<img src="email.php?addr=moc[dot]emoh[at]resu">



To 'encrypt' the eMail address to pass to the script, write the address backwards and replace "." with "[dot]" and "@" with "[at]". It's not the most ironclad protection, but it thwarts most casual eMail sniffers.

php dot net at mvoncken dot nl
14-Feb-2003 10:18


A simple example:

To make one line of text fit in the image.



<?php

header ("Content-type: image/png");

$string = "spam@mvoncken.nl";                                              

$font   = 4;

$width  = ImageFontWidth($font) * strlen($string);

$height = ImageFontHeight($font);



$im = @imagecreate ($width,$height);

$background_color = imagecolorallocate ($im, 255, 255, 255); //white background

$text_color = imagecolorallocate ($im, 0, 0,0);//black text

imagestring ($im, $font, 0, 0,  $string, $text_color);

imagepng ($im);

?>



I use something like this for spamprotection of my visitors (pass userid as an url-parameter for this php)

aholmes84 at hotmail dot com
08-Nov-2002 07:25


When setting the font, any integer less than 1 defaults to 1, and any integer greater than 5 defaults to 5.

deejay_world at yahoo dot com
11-Jun-2002 02:25


Width ImageString, the strings you draw are not automatically wrapped width the edge of the image. You may use this function to automatically wrap them:



function ImageStringWrap($image, $font, $x, $y, $text, $color, $maxwidth)

{

    $fontwidth = ImageFontWidth($font);

    $fontheight = ImageFontHeight($font);



    if ($maxwidth != NULL) {

        $maxcharsperline = floor($maxwidth / $fontwidth);

        $text = wordwrap($text, $maxcharsperline, "\n", 1);

      }



    $lines = explode("\n", $text);

    while (list($numl, $line) = each($lines)) {

        ImageString($image, $font, $x, $y, $line, $color);

        $y += $fontheight;

      }

}



So, in particular, if you want to wrap a text with the edge of the Image, you may do:

ImageStringWrap($img, $font, 0, $y, $text, $color, ImageSX($img) );

bob dot brown at opus dot co dot nz
02-Apr-2002 11:59


If you find that you are getting two characters on the end of your imageString that look like a Y and an upside down L then they're probably representations of CR/LF.  Try trim()ing the string before outputting it.  (I was sooo sure this was a bug <g>)

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Last updated: Fri, 19 Jun 2009