substr_replace
Drop extensions of a file (even from a file location string)
<?php
$filename = "c:/some dir/abc defg. hi.jklmn";
echo substr($filename, 0, (strlen ($filename)) - (strlen (strrchr($filename,'.'))));
?>
output: c:/some dir/abc defg. hi
Hope it may help somebody like me.. (^_^)
substr
(PHP 4, PHP 5)
substr — Devuelve parte de una cadena
Descripción
string substr
( string $cadena
, int $comienzo
[, int $longitud
] )
substr() devuelve la porción de cadena especificada por los parámetros comienzo y longitud .
Si comienzo es positivo o 0, la cadena devuelta comenzará en dicho carácter de cadena (los caracteres empiezan a contarse en cero). Por ejemplo, en la cadena 'abcdef', el carácter en la posición 0 es 'a', el carácter en la posición 2 es 'c', y así sucesivamente.
Example #1 Ejemplo básico de substr()
<?php
echo substr('abcdef', 1); // bcdef
echo substr('abcdef', 1, 3); // bcd
echo substr('abcdef', 0, 4); // abcd
echo substr('abcdef', 0, 8); // abcdef
echo substr('abcdef', -1, 1); // f
// El acceso a los caracteres dentro de una cadena se puede
// realizar directamente mediante las llaves
$string = 'abcdef';
echo $string{0}; // a
echo $string{3}; // d
echo $string{strlen($string)-1}; // f
?>
Si comienzo es negativo, la cadena devuelta comenzará en dicha posición contando desde el final de cadena .
Example #2 Ejemplo de valores negativos de comienzo
<?php
$rest = substr("abcdef", -1); // devuelve "f"
$rest = substr("abcdef", -2); // devuelve "ef"
$rest = substr("abcdef", -3, 1); // devuelve "d"
?>
Si se especifica longitud y es positiva, la cadena devuelta terminará como máximo longitud caracteres tras el comienzo . Si la longitud de la cadena es inferior o igual al valor del comienzo, la función devuelve FALSE.
Si se especifica longitud y es negativa, se omitirán longitud caracteres desde el final de la cadena (después de que la posición de comienzo se haya determinado cuando el comienzo es negativo). Si comienzo indica una posición mas allá de estos límites, se devuelve una cadean vacía.
Example #3 Ejemplo de uso de una longitud negativa
<?php
$rest = substr("abcdef", 0, -1); // returns "abcde"
$rest = substr("abcdef", 2, -1); // returns "cde"
$rest = substr("abcdef", 4, -4); // returns ""
$rest = substr("abcdef", -3, -1); // returns "de"
?>
Vea también strrchr(), substr_replace(), ereg(), trim(), mb_substr() y wordwrap().
add a note
User Contributed Notessubstr
kaysar in ymail in com
08-Jun-2009 06:58
08-Jun-2009 06:58
benny at bennyborn dot de
06-May-2009 08:52
06-May-2009 08:52
If you need a word-sensitive and also html-tags aware version of substr, this one should do the job. It works fine for me
<?php
/**
* word-sensitive substring function with html tags awareness
* @param text The text to cut
* @param len The maximum length of the cut string
* @returns string
**/
function substrws( $text, $len=180 ) {
if( (strlen($text) > $len) ) {
$whitespaceposition = strpos($text," ",$len)-1;
if( $whitespaceposition > 0 )
$text = substr($text, 0, ($whitespaceposition+1));
// close unclosed html tags
if( preg_match_all("|<([a-zA-Z]+)>|",$text,$aBuffer) ) {
if( !empty($aBuffer[1]) ) {
preg_match_all("|</([a-zA-Z]+)>|",$text,$aBuffer2);
if( count($aBuffer[1]) != count($aBuffer2[1]) ) {
foreach( $aBuffer[1] as $index => $tag ) {
if( empty($aBuffer2[1][$index]) || $aBuffer2[1][$index] != $tag)
$text .= '</'.$tag.'>';
}
}
}
}
}
return $text;
}
?>
Andreas Bur (andreas dot buro at gmail dot com)
29-Apr-2009 01:25
29-Apr-2009 01:25
For getting a substring of UTF-8 characters, I highly recommend mb_substr
<?php
$utf8string = "cakeæøå";
echo substr($utf8string,0,5);
// output cake#
echo mb_substr($utf8string,0,5,'UTF-8');
//output cakeæ
?>
webmaster at oehoeboeroe dot nl
18-Apr-2009 09:07
18-Apr-2009 09:07
You might expect substr('123456', 6) to return an empty string. Instead it returns boolean FALSE.
This behavior should be mentioned in the Return Values section of the manual. Instead it is only mentioned in the Parameters section.
If you need an empty string instead of a boolean FALSE you should typecast the result to a string.
<?php
$a = substr('123456', 6); // equivalent to $a = FALSE
$a = (string) substr('123456', 6); // equivalent to $a = '';
?>
Jakob S.
15-Apr-2009 02:13
15-Apr-2009 02:13
If you need to get the first $num Chars of $str and remove them from $str you'll want to use following function:
<?php
function string_shift(&$str,$num) {
$cutOff=substr($str,0,$num);
$str=substr($str,$num);
return $cutOff;
}
?>
sajjad at sajjad dot biz
08-Apr-2009 07:28
08-Apr-2009 07:28
Substring utf-8 strings!
very simple!
<?php
function substru($str,$from,$len){
return preg_replace('#^(?:[\x00-\x7F]|[\xC0-\xFF][\x80-\xBF]+){0,'. $from .'}'.'((?:[\x00-\x7F]|[\xC0-\xFF][\x80-\xBF]+){0,'. $len .'}).*#s','$1', $str);
}
?>
link
22-Mar-2009 01:52
22-Mar-2009 01:52
And as always there is bound to be a bug:
<?php
function strlen_entities($text)
{
preg_match_all(
'/((?:&(?:#[0-9]{2,}|[a-z]{2,});)|(?:[^&])|'.
'(?:&(?!\w;)))s',$text,$textarray);
return count($textarray[0]);
}
function substr_entities($text,$start,$limit=0)
{
$return = '';
preg_match_all(
'/((?:&(?:#[0-9]{2,}|[a-z]{2,});)|(?:[^&])|'.
'(?:&(?!\w;)))s',$text,$textarray);
$textarray = $textarray[0];
$numchars = count($textarray)-1;
if ($start>=$numchars)
return false;
if ($start<0)
{
$start = ($numchars)+$start+1;
}
if ($start>=0)
{
if ($limit==0)
{
$end=$numchars;
}
elseif ($limit>0)
{
$end = $start+($limit-1);
}
else
{
$end = ($numchars)+$limit;
}
for ($i=$start;($i<=$end && isset($textarray[$i]));$i++)
{
$return .= $textarray[$i];
}
return $return;
}
}
?>
link
21-Mar-2009 03:19
21-Mar-2009 03:19
I created some functions for entity-safe splitting+lengthcounting:
<?php
function strlen_entities($text)
{
preg_match_all(
'/((?:&(?:#[0-9]{2,}|[a-z]{2,});)|(?:[^&])|'.
'(?:&(?!\w;)))s',$text,$textarray);
return count($textarray[0]);
}
function substr_entities($text,$start,$limit=0)
{
$return = '';
preg_match_all(
'/((?:&(?:#[0-9]{2,}|[a-z]{2,});)|(?:[^&])|'.
'(?:&(?!\w;)))s',$text,$textarray);
$textarray = $textarray[0];
$numchars = count($textarray)-1;
if ($start>=$numchars)
return false;
if ($start<0)
{
$start = ($numchars)+$start+1;
}
if ($start>=0)
{
if ($limit==0)
{
$end=$numchars;
}
elseif ($limit>0)
{
$end = $start+($limit-1);
}
else
{
$end = ($numchars)+$limit;
}
for ($i=$start;$i<=$end;$i++)
{
$return .= $textarray[$i];
}
return $return;
}
}
?>
ralphingATNOSPAMDOTpocztaDOTonetDOTpl
11-Mar-2009 01:08
11-Mar-2009 01:08
this function return string between two delimiters
i found it very useful to get text between html tags
<?php
function strbet($inputStr, $delimeterLeft, $delimeterRight, $debug=false) {
$posLeft=strpos($inputStr, $delimeterLeft);
if ( $posLeft===false ) {
if ( $debug ) {
echo "Warning: left delimiter '{$delimeterLeft}' not found";
}
return false;
}
$posLeft+=strlen($delimeterLeft);
$posRight=strpos($inputStr, $delimeterRight, $posLeft);
if ( $posRight===false ) {
if ( $debug ) {
echo "Warning: right delimiter '{$delimeterRight}' not found";
}
return false;
}
return substr($inputStr, $posLeft, $posRight-$posLeft);
}
?>
jude dot dadzie at gmail dot com
24-Feb-2009 03:30
24-Feb-2009 03:30
Here's a simple direct way of extracting the information you need from a string...
Suppose your string is "C:/www/vhosts/example.com/images/image1.jpg" which points to an image. Let's assume you want the part "images/image1.jpg". We have to do the ff:
<?php
$image="C:/www/vhosts/example.com/images/image1.jpg"
$image=substr($image,strpos($image,'image', (strlen($image)-strpos($image,'image'))));
echo $image."<br/>"; //will give 'images/image1.jpg'
?>
wrapbit at yahoo dot com
31-Oct-2008 09:00
31-Oct-2008 09:00
<?php
$cfg[csvEnc] = '"';
$cfg[csvEsc] = '\\';
$cfg[csvTerm] = ",";
if( !function_exists("parse_csv_aux") ){
function parse_csv_aux( $string ){
global $cfg;
$product = "";
$in_quote = FALSE;
$skipped_quote = FALSE;
for($i = 0 ; $i < strlen($string) ; $i++){
if( $string{$i} == $cfg[csvEnc] ){
if($in_quote){
if($skipped_quote){
$product .= $cfg[csvEnc];
$skipped_quote = FALSE;
}
else if( !$skipped_quote ){
$skipped_quote = TRUE;
}
$in_quote = FALSE;
}
else{
if($skipped_quote) $skipped_quote = FALSE;
$in_quote = TRUE;
}
}
else if( $string{$i} == "," ){
if($in_quote){
$product .= ",";
}
else{
$product .= " ~ ";
}
}
else{
if($in_quote){
//$in_quote = FALSE;
$product .= $string{$i};
}
else{
$product .= $string{$i};
}
}
}
return $product;
}
}
if( !function_exists("parse_csv") ){
function parse_csv($string){
global $cfg;
$data = array();
if( is_string($string) && ( stripos($string, "\n") !== FALSE ) ){
$data = explode("\n", parse_csv_aux($string) );
foreach($data as $key => $row){
$columns = array();
//$row = strtr( $row, array( "\";\"" => "\";\"", ";" => " ; " ) );
if( stripos($row, " ~ ") !== FALSE ){
$columns = explode( " ~ ", $row );
if( !is_array($columns) )$columns = array( strval($columns) );
$data[$key] = $columns;
}
}
return $data;
}
else if( is_string($string) && ( stripos( ($string = parse_csv_aux($string)), " ~ ") !== FALSE ) ){
$columns = explode( " ~ ", $string );
if( !is_array($columns) )$columns = array( strval($columns) );
return array($columns);
}
else return strval($string);
} /* end function parse_csv */
} /* end not function exists parse_csv */
if( !function_exists("store_csv_aux") ){
function store_csv_aux( $string ){
global $cfg;
$string = strtr( $string, array( "\n" => "" ) );
$product = "";
$in_quote = FALSE;
for( $i = 0 ; $i < strlen($string) ; $i++ ){
if( $string{$i} == $cfg[csvEnc] ){
if($in_quote){
$product .= "\"{$cfg[csvEnc]}";
}
else{
$product .= "\"\"{$cfg[csvEnc]}";
$in_quote = TRUE;
}
}
else if( $string{$i} == "," ){
if($in_quote){
$product .= ",";
}
else{
$product .= "\",";
$in_quote = TRUE;
}
}
else{
if($in_quote){
$product .= $cfg[csvEnc];
$in_quote = FALSE;
$product .= $string{$i};
}
else{
$product .= $string{$i};
}
}
}
if($in_quote)$product .= $cfg[csvEnc];
return $product;
}
}
if( !function_exists("store_csv") ){
function store_csv($data){
global $cfg;
if(!is_array($data))return strval($data);
$passed_rows = FALSE;
$product = "";
foreach($data as $row){
if( $passed_rows )$product .= "\n";
if( is_array($row) ){
$columns = "";
$passed_cols = FALSE;
foreach($row as $column){
if( $passed_cols )$columns .= ",";
$columns .= store_csv_aux( $column );
$passed_cols =TRUE;
}
$product .= strval($columns);
}
else{
$product .= strtr( strval($row), array("\n" => "") );
}
$passed_rows = TRUE;
}
return $product;
} /* end function store_csv */
} /* end not function exists store_csv */
?>
[EDIT BY danbrown AT php DOT net: This is a bugfix rewrite of a function originally written by "Alexander Peev".]
bill at eupeople dot net
31-Oct-2008 12:52
31-Oct-2008 12:52
hi, really basic function to take blob with full http url's and turn then into "more info" links, handy for page layout etc ;)
<?php
function urltolink($data){
while (strpos($wdata, "http")) {
$op=strpos($wdata, "http");
$rdata=substr($wdata, 0, $op);
$ndata=substr($wdata, $op, strlen($wdata)-$op);
$cp=strpos($ndata, "\n");
$link=substr($ndata, 0, $cp);
$oc=$op+$cp;
$wdata=substr($wdata, $oc, strlen($wdata)-$oc);
$edata=$edata."$rdata <a href=\"$link\">more info</a><br />";
}
return $edata;
}
?>
mar dot czapla at gmail dot com
24-Oct-2008 09:31
24-Oct-2008 09:31
Here we have gr8 function which simply convert ip address to a number using substr with negative offset.
You can need it if you want to compare some IP addresses converted to a numbers.
For example when using ip2country, or eliminating same range of ip addresses from your website :D
<?php
function ip2no($val)
{
list($A,$B,$C,$D) = explode(".",$val);
return
substr("000".$A,-3).
substr("000".$B,-3).
substr("000".$C,-3).
substr("000".$D,-3);
}
$min = ip2no("10.11.1.0");
$max = ip2no("111.11.1.0");
$visitor = ip2no("105.1.20.200");
if($min<$visitor && $visitor<$max)
{ echo 'Welcome !'; }
else
{ echo 'Get out of here !'; }
?>
mr.davin
29-Sep-2008 05:01
29-Sep-2008 05:01
Simple use of substr to determine possession:
<?php
function possessive ($word) {
return $word.(substr($word, -1) == 's' ? "'" : "'s");
}
// Davis => Davis'
// Paul => Paul's
?>
NULL_byte
19-Sep-2008 10:21
19-Sep-2008 10:21
<?php
function insert_substr($str, $pos, $substr) {
$part1 = substr($str, 0, -$pos);
$part2 = substr($str, -$pos);
return $part1.$substr.$part2;
}
?>
baldaris69 at yahoo dot com
29-Aug-2008 07:57
29-Aug-2008 07:57
***Caution newbie***
To extract a file Extension this fuction could be useful.
<?php
$file_extension = substr($filename , strrpos($filename , '. ') +1);
?>
Suppose your file name is Baldaris.jpeg
strrpos will return the last dot position in the string 9 so
so the compiler will execute substr($filename , 10)
$file_extension will have value jpeg
pretty cool...
Cheer's
Baldaris
post [at] jannik - zappe [dot] de
05-Aug-2008 02:59
05-Aug-2008 02:59
Just a little function to cut a string by the wanted amount. Works in both directions.
<?php
function cutString($str, $amount = 1, $dir = "right")
{
if(($n = strlen($str)) > 0)
{
if($dir == "right")
{
$start = 0;
$end = $n-$amount;
} elseif( $dir == "left") {
$start = $amount;
$end = $n;
}
return substr($str, $start, $end);
} else return false;
}
?>
Enjoy ;)
jamesvanboxtel at wsu dot edu
31-Jul-2008 09:17
31-Jul-2008 09:17
Here is a quick function to get the substring of a string up to and including the last occurrence of $needle
<?php
function substrtruncate($string, $needle)
{
return substr($string, 0, strrpos($string, $needle)+1);
}
$current_dir = substrtruncate($_SERVER['SCRIPT_NAME'], '/');
?>
Anonymous
29-Jul-2008 06:18
29-Jul-2008 06:18
I wrote this simple function to limit the middle characters of a string to a specified length.
<?php
$input = "hello world"
echo(limitchrmid($imput,10)) // hel ... rld
//limit chars middle
function limitchrmid($value,$lenght){
if (strlen($value) >= $lenght ){
$lenght_max = ($lenght/2)-3;
$start = strlen($value)- $lenght_max;
$limited = substr($value,0,$lenght_max);
$limited.= " ... ";
$limited.= substr($value,$start,$lenght_max);
}
else{
$limited = $value;
}
return $limited;
}
?>
svihel
27-Jun-2008 08:09
27-Jun-2008 08:09
joao dot martins at plako dot net
26-Mar-2008 09:14
ben at enemy dot dk
10-Feb-2008 05:48
Updated function. The previous one will return empty value if the $string has no letter spaces. This is usefull if some of your strings have only one word.
<?php
function cutText($string, $setlength) {
$length = $setlength;
if($length<strlen($string)){
while (($string{$length} != " ") AND ($length > 0)) {
$length--;
}
if ($length == 0) return substr($string, 0, $setlength);
else return substr($string, 0, $length);
}else return $string;
}
?>
serzh at nm dot ru
03-Jun-2008 10:13
03-Jun-2008 10:13
easy and quick way to limit length of a text by not cutting full words:
textLimit('some words', 7) is 'some...'
<?php
function textLimit($string, $length, $replacer = '...')
{
if(strlen($string) > $length)
return (preg_match('/^(.*)\W.*$/', substr($string, 0, $length+1), $matches) ? $matches[1] : substr($string, 0, $length)) . $replacer;
return $string;
}
?>
Anonymous
17-Mar-2008 11:53
17-Mar-2008 11:53
Split a string to an array of strings specified by an array of lengths:
<?php
function split_by_lengths($inString, $arrayLengths)
{
$output = array();
foreach ($arrayLengths as $oneLength)
{
$output[] = substr($inString, 0, $oneLength);
$inString = substr($inString, $oneLength);
}
return ($output);
}
?>
split_by_lengths('teststringtestteststring', array(4,6,4,4,6)) returns:
array('test','string','test','test','string')
Don't use it on user input without some error handling!
kriskra at gmail dot com
01-Mar-2008 01:21
01-Mar-2008 01:21
The javascript charAt equivalent in php of felipe has a little bug. It's necessary to compare the type (implicit) aswell or the function returns a wrong result:
<?php
function charAt($str,$pos) {
return (substr($str,$pos,1) !== false) ? substr($str,$pos,1) : -1;
}
?>
Anonymous
23-Feb-2008 01:12
23-Feb-2008 01:12
I've used the between, after, before, etc functions that biohazard put together for years and they work great. I've also added to it a new function that I use a lot and thought others might like it as well. It uses his before/after functions so they are required to use it.
<?php
$example_html = "<p>test1 Test2</p><title>hi there</title><p>Testing</p>";
$paragraph_text = multi_between('<p>', '</p>', $example_html);
//Prints an arry of:
//Array ( [1] => test1 Test2 [2] => Testing )
print_r($paragraph_text);
function multi_between($this, $that, $inthat)
{
$counter = 0;
while ($inthat)
{
$counter++;
$elements[$counter] = before($that, $inthat);
$elements[$counter] = after($this, $elements[$counter]);
$inthat = after($that, $inthat);
}
return $elements;
}
//Get the help functions from biohazard's post below.
?>
highstrike at gmail dot com
06-Jan-2008 04:47
06-Jan-2008 04:47
Because i didnt see a function that would cut a phrase from a text (article or whatever) no matter where, front/middle/end and add ... + keeping the words intact, i wrote this:
Usage:
- The parameter $value if array will need the whole text and the portion you want to start from, a string. EG: cuttext(array($text, $string), 20). If the string is "have" and is near the beginning of the text, the function will cut like "I have a car ...", if the string is in the middle somewhere it will cut like "... if you want to have your own car ..." and if its somewhere near the end it will cut like "... and you will have one."
- The $length parameter is self explanatory.
Note: if you have just a string "127hh43h2h52312453jfks2" and you want to cut it, just use the function like so: cuttext($string, 10) and it will cut it like "127hh43h2h..."
<?php
////////////////////////////////////////////////////////
// Function: cuttext
// Description: Cuts a string and adds ...
function cuttext($value, $length)
{
if(is_array($value)) list($string, $match_to) = $value;
else { $string = $value; $match_to = $value{0}; }
$match_start = stristr($string, $match_to);
$match_compute = strlen($string) - strlen($match_start);
if (strlen($string) > $length)
{
if ($match_compute < ($length - strlen($match_to)))
{
$pre_string = substr($string, 0, $length);
$pos_end = strrpos($pre_string, " ");
if($pos_end === false) $string = $pre_string."...";
else $string = substr($pre_string, 0, $pos_end)."...";
}
else if ($match_compute > (strlen($string) - ($length - strlen($match_to))))
{
$pre_string = substr($string, (strlen($string) - ($length - strlen($match_to))));
$pos_start = strpos($pre_string, " ");
$string = "...".substr($pre_string, $pos_start);
if($pos_start === false) $string = "...".$pre_string;
else $string = "...".substr($pre_string, $pos_start);
}
else
{
$pre_string = substr($string, ($match_compute - round(($length / 3))), $length);
$pos_start = strpos($pre_string, " "); $pos_end = strrpos($pre_string, " ");
$string = "...".substr($pre_string, $pos_start, $pos_end)."...";
if($pos_start === false && $pos_end === false) $string = "...".$pre_string."...";
else $string = "...".substr($pre_string, $pos_start, $pos_end)."...";
}
$match_start = stristr($string, $match_to);
$match_compute = strlen($string) - strlen($match_start);
}
return $string;
}
?>
morgangalpin att gmail dotty com
24-Sep-2007 05:55
24-Sep-2007 05:55
Adding the $limit parameter introduced a bug that was not present in the original. If $limit is small or negative, a string with a length exceeding the limit can be returned. The $limit parameter should be checked. It takes slightly more processing, but it is dwarfed in comparison to the use of strlen().
<?php
function short_name($str, $limit)
{
// Make sure a small or negative limit doesn't cause a negative length for substr().
if ($limit < 3)
{
$limit = 3;
}
// Now truncate the string if it is over the limit.
if (strlen($str) > $limit)
{
return substr($str, 0, $limit - 3) . '...';
}
else
{
return $str;
}
}
?>
corphi
12-Sep-2007 11:06
12-Sep-2007 11:06
I prefer
<?php
function short_name($str, $limit)
{
return strlen($str) > $limit ? substr($str, 0, $limit - 3) . '...' : $str;
}
?>
Now, every returned string has a maximum length of $limit chars (instead of $limit + 3).
Petez
31-Aug-2007 10:56
31-Aug-2007 10:56
I wanted to work out the fastest way to get the first few characters from a string, so I ran the following experiment to compare substr, direct string access and strstr:
<?php
/* substr access */
beginTimer();
for ($i = 0; $i < 1500000; $i++){
$opening = substr($string,0,11);
if ($opening == 'Lorem ipsum'){
true;
}else{
false;
}
}
$endtime1 = endTimer();
/* direct access */
beginTimer();
for ($i = 0; $i < 1500000; $i++){
if ($string[0] == 'L' && $string[1] == 'o' && $string[2] == 'r' && $string[3] == 'e' && $string[4] == 'm' && $string[5] == ' ' && $string[6] == 'i' && $string[7] == 'p' && $string[8] == 's' && $string[9] == 'u' && $string[10] == 'm'){
true;
}else{
false;
}
}
$endtime2 = endTimer();
/* strstr access */
beginTimer();
for ($i = 0; $i < 1500000; $i++){
$opening = strstr</