Funcții ale tablourilor (Array)
PHP Manual

array_walk

(PHP 4, PHP 5, PHP 7)

array_walkApply a user supplied function to every member of an array

Descrierea

bool array_walk ( array &$array , callable $callback [, mixed $userdata = NULL ] )

Applies the user-defined callback function to each element of the array array.

array_walk() is not affected by the internal array pointer of array. array_walk() will walk through the entire array regardless of pointer position.

Parametri

array

The input array.

callback

Typically, callback takes on two parameters. The array parameter's value being the first, and the key/index second.

Notă:

If callback needs to be working with the actual values of the array, specify the first parameter of callback as a reference. Then, any changes made to those elements will be made in the original array itself.

Notă:

Many internal functions (for example strtolower()) will throw a warning if more than the expected number of argument are passed in and are not usable directly as a callback.

Only the values of the array may potentially be changed; its structure cannot be altered, i.e., the programmer cannot add, unset or reorder elements. If the callback does not respect this requirement, the behavior of this function is undefined, and unpredictable.

userdata

If the optional userdata parameter is supplied, it will be passed as the third parameter to the callback.

Valorile întoarse

Întoarce valoarea TRUE în cazul succesului sau FALSE în cazul eșecului.

Erori/Excepții

If function callback requires more parameters than given to it, an error of level E_WARNING will be generated each time array_walk() calls callback.

Exemple

Example #1 array_walk() example

<?php
$fruits 
= array("d" => "lemon""a" => "orange""b" => "banana""c" => "apple");

function 
test_alter(&$item1$key$prefix)
{
    
$item1 "$prefix$item1";
}

function 
test_print($item2$key)
{
    echo 
"$key$item2<br />\n";
}

echo 
"Before ...:\n";
array_walk($fruits'test_print');

array_walk($fruits'test_alter''fruit');
echo 
"... and after:\n";

array_walk($fruits'test_print');
?>

Exemplul de mai sus va afișa:

Before ...:
d. lemon
a. orange
b. banana
c. apple
... and after:
d. fruit: lemon
a. fruit: orange
b. fruit: banana
c. fruit: apple

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Funcții ale tablourilor (Array)
PHP Manual