PHP array walk

Education is not limited to just classrooms. It can be gained anytime, anywhere... - Ravi Ranjan (M.Tech-NIT)

PHP: array_walk() function

PHP: Apply a user supplied function to every member of an array

The array_walk() function apply a user defined function to every element of an array. The user-defined function takes array's values and keys as parameters.

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

Version

(PHP 4 and above)

Syntax

array_walk(input_array, user_function, user_data)

Parameters

Name

Description

Required /
Optional

Type

input_array

The input array.

Required

Array

user_function

The name of the userdefined function.

Required

-

user_data

Additional parameter. If it is supplied, it will be passed as the third parameter to the user_function.

Optional

Mixed*

*Mixed : Mixed indicates that a parameter may accept multiple (but not necessarily all) types.

Return value

TRUE on success or FALSE on failure.

Value Type : Boolean.

Pictorial Presentation :

php array array_walk() function

Example :

  1. function w3rfunction($value,$key)  

  2. {  

  3. echo "w3resource $key has $value
    ";  

  4. }  

  5. $tutorials=array("tutorial1"=>"php","tutorial2"=>"xml","tutorial3"=>"javascript");  

  6. array_walk($tutorials,"w3rfunction");  

  7. ?>  

Output :

w3resource tutorial1 has php
w3resource tutorial2 has xml
w3resource tutorial3 has javascript