PHP Array_map ()

Definition and usage

The Array_map () function returns an array after the user-defined function is functional. The number of arguments that the callback function accepts should be the same as the number of arrays passed to the Array_map () function.

Grammar

Array_map (Function,array1,array2,array3 ...)

Parameters	Describe
function	Necessary. The name of the user-defined function, or null.
Array1	Necessary. Specifies the array.
Array2	Optional. Specifies the array.
Array3	Optional. Specifies the array.

Example 2

Use multiple parameters:

<?phpfunction MyFunction ($v 1, $v 2) {    if ($v 1=== $v 2) {        return "Same";    }    return "Different";} $a 1 = Array ("Horse", "Dog", "Cat"), $a 2 = Array ("Cow", "Dog", "Rat");p Rint_r (Array_map ("MyFunction", $a 1, $a 2)); >

Output:

Array ([0] = different [1] = same [2] = different)

Example 3

See what happens when a custom function name is set to null:

<?php$a1 = Array ("Dog", "Cat"), $a 2 = Array ("Puppy", "Kitten");p Rint_r (Array_map (null, $a 1, $a 2)); >

Output:

Array ([0] = = Array ([0] = Dog [1] = Puppy) [1] = = Array ([0] = = Cat [1] = Kitten))

　　

PHP Array_map ()