PHP array_walk() Function Usage and Example

PHP Array Function Manual

The array_walk() function uses a user-defined function to perform callback processing on each element of the array

Syntax

array_walk ( $array, $funcname [, $parameter] );

Definition and Usage

　Apply the user-defined function funcname to each element of the array.
array_walk() is not affected by the internal array pointer of the array. array_walk() will traverse the entire array regardless of the pointer position.

Return Value

　　Returns TRUE on success, or FALSE on failure.

Parameter

Online Example

<?php
　　　function call_back_function($value,$key) {
　　　　　　echo "The value of key $key is $value \n";
　　　}
　　　$input = array("a"=>"green", "b"=>"brown", "c"=>"blue", "red");
　　　
　　　array_walk($input,"call_back_function");
?>

Output result:

The value of key a is green　
The value of key b is brown　
The value of key c is blue　
The value of key 0 is red

　 PHP Array Function Manual