array_walk() function in PHP

The array_walk() method applies a user-defined function to each member of an array. Returns TRUE on success and FALSE on failure.

Syntax

array_walk(arr, custom_func, parameter)

Parameters

• arr - The specified array. Required.

• custom_func - User-defined function. Required.

• #parameter - Parameters set for the custom function. Optional.

Return value

The array_walk() function returns TRUE on success and FALSE on failure.

Example

The following is an example-

Live Demo

<?php
function display($val,$key) {
   echo "$key id : Student $val<br>";
}
$arr = array("p"=>"Tom","q"=>"Jack","r"=>"Amit");
array_walk($arr,"display");
?>

Output

The following is the output-

p id : Student Tom
q id : Student Jack
r id : Student Amit

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