php : Array_map

Array_map send each value of an array to a function, multiply each value by itself, and return an array with the new values.

Simply, but not simple

Ok, one function one usage. Not really true, you could really use this function for another usage

• Call inside a class
• Use external function on another class
• Put some extra datas on parameters

Simple usage

function cube($n)
{
return($n * $n * $n);
}

$a = array(1, 2, 3, 4, 5);
$b = array_map("cube", $a);
print_r($b);

Call inside a class

External function

Syntax : array_map( array( __CLASS__, 'methodName' ), $array );

Example : array_map(array($this, 'dash'), $data);

Use external function on another class

Syntax : array_map( array( 'ClassName', 'methodName' ), $array );

Use extra parameters (datax : array)

function dash($data1,$data2)
{
…
}

array_map(array($this, 'dash'), $data1, $data2);

Could also seen on

array_walk(), call_user_func(), call_user_func_array()