array_chunk
Also, Khalys function only works if keys of both arrays are the same because array_combine ignores keys. An easy way to ignore them is by taking array_values(). Floats can be casted to strings to avoid overwriting.
So, the PHP4 function could look something like this:
<?php
function array_combine($arr1, $arr2) {
$out = array();
$arr1 = array_values($arr1);
$arr2 = array_values($arr2);
foreach($arr1 as $key1 => $value1) {
$out[(string)$value1] = $arr2[$key1];
}
return $out;
}
?>
array_combine
(PHP 5)
array_combine — Crea una nueva matriz, usando una matriz para las claves y otra para sus valores
Descripción
array array_combine
( array $claves
, array $valores
)
Crea un array usando los valores de la matriz claves como claves, y los valores de la matriz valores como los valores correspondientes.
Lista de parámetros
- claves
-
Matriz de las claves a usar
- valores
-
Matriz de valores a usar
Valores retornados
Devuelve el valor tipo array combinado, FALSE si el número de elementos de cada matriz no es equivalente o si las matrices están vacías.
Errors/Exceptions
Genera un E_WARNING si claves y valores son matrices vacías, o el número de elementos no coincide.
Ejemplos
Example #1 Un ejemplo simple de array_combine()
<?php
$a = array('verde', 'rojo', 'amarillo');
$b = array('aguacate', 'manzana', 'banano');
$c = array_combine($a, $b);
print_r($c);
?>
El resultado del ejemplo seria:
Array ( [verde] => aguacate [rojo] => manzana [amarillo] => banano )
add a note
User Contributed Notesarray_combine
Zoran
02-Apr-2008 02:57
02-Apr-2008 02:57
Mike Jean
19-Mar-2008 06:59
19-Mar-2008 06:59
Khaly's PHP4 code below does not work correctly in all cases. Consider when your array consists of floats:
<?php
$okay = array(0, 10, 20, 30);
$not_okay = array(0, 0.5, 1, 1.5);
$foo = array_combine($okay, $okay);
$bar = array_combine($not_okay, $not_okay);
/*
Results:
$foo = {
[0]=> int(0)
[10]=> int(10)
[20]=> int(20)
[30]=> int(30)
}
$bar = {
[0]=> float(0.5)
[1]=> float(1.5)
}
*/
?>
What can you do? In my case, I was just zipping up some select-box options, so I converted everything in my floats to strings.
Khaly
04-Oct-2007 11:11
04-Oct-2007 11:11
This is the function for PHP4 :
<?php
function array_combine($arr1,$arr2) {
$out = array();
foreach($arr1 as $key1 => $value1) {
$out[$value1] = $arr2[$key1];
}
return $out
}
?>
neoyahuu at yahoo dot com
20-Mar-2007 05:36
20-Mar-2007 05:36
Some tips for merging same values in an array
<?php
$array1 = array(1,2,3,4,5,6,7,8,9,10,11,12);
$array2 = array(1,2,3,13);
$merged = array_merge($array1,$array2);
// output normal array_merge
echo '<pre>After array_merge :
';
print_r($merged);
echo '</pre>';
// do double flip for merging values in an array
$merged = array_flip($merged);
$merged = array_flip($merged);
// Output after
echo '<pre>After Double Flip :
';
print_r($merged);
echo '</pre>';
?>
Output ::
After array_merge :
Array
(
[0] => 1
[1] => 2
[2] => 3
[3] => 4
[4] => 5
[5] => 6
[6] => 7
[7] => 8
[8] => 9
[9] => 10
[10] => 11
[11] => 12
[12] => 1
[13] => 2
[14] => 3
[15] => 13
)
After Double Flip :
Array
(
[12] => 1
[13] => 2
[14] => 3
[3] => 4
[4] => 5
[5] => 6
[6] => 7
[7] => 8
[8] => 9
[9] => 10
[10] => 11
[11] => 12
[15] => 13
)
ifeghali at interveritas dot net
26-Feb-2005 07:53
26-Feb-2005 07:53
Use that code to group an array by its first element.
<?
function groupbyfirst($array)
{
foreach ($array as $row)
{
$firstkey = array_keys($row);
$firstkey = $firstkey[0];
$key = $row[$firstkey];
unset($row[$firstkey]);
$newarray[$key][] = $row;
}
return $newarray;
}
?>
Example:
<?
$array =
Array(
0 => Array('color' => 'red','name' => 'apple', 'quantity' => '3'),
1 => Array('color' => 'green','name' => 'pear', 'quantity' => '2'),
2 => Array('color' => 'yellow','name' => 'corn', 'quantity' => '3'),
3 => Array('color' => 'blue','name' => 'grape', 'quantity' => '4'),
4 => Array('color' => 'yellow','name' => 'banana', 'quantity' => '13'),
);
$output = groupbyfirst($array);
print_r($output);
?>
will return:
Array
(
[red] => Array ( [0] => Array ( [name] => apple [quantity] => 3 ) )
[green] => Array ( [0] => Array ( [name] => pear [quantity] => 2 ) )
[yellow] => Array ( [0] => Array ( [name] => corn [quantity] => 3 ), [1] => Array ( [name] => banana [quantity] => 13 ) )
[blue] => Array ( [0] => Array ( [name] => grape [quantity] => 4 ))
)
Or you can use mysql recordset:
<?
while ($row=mysql_fetch_array($result,MYSQL_ASSOC))
{
$firstkey = array_keys($row);
$firstkey = $firstkey[0];
$key = $row[$firstkey];
unset($row[$firstkey]);
$newarray[$key][] = $row;
}
?>
aidan at php dot net
21-May-2004 04:15
21-May-2004 04:15
This functionality is now implemented in the PEAR package PHP_Compat.
More information about using this function without upgrading your version of PHP can be found on the below link:
http://pear.php.net/package/PHP_Compat