PHP Array_Map

<?php

function myfunction($v) 

{

if ($v==="Dog")

    {

    return "Fido";

    }

return $v;

}

$a=array("Horse","Dog","Cat");

print_r(array_map("myfunction",$a));

?>

输出：

Array ( [0] => Horse [1] => Fido [2] => Cat )

<?php

function myfunction($v1,$v2) 

{

if ($v1===$v2)

    {

    return "same";

    }

return "different";

}

$a1=array("Horse","Dog","Cat");

$a2=array("Cow","Dog","Rat");

print_r(array_map("myfunction",$a1,$a2));

?>

输出：

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

请看当自定义函数名设置为 null 时的情况：

<?php

$a1=array("Dog","Cat");

$a2=array("Puppy","Kitten");

print_r(array_map(null,$a1,$a2));

?>

输出：

Array (

[0] => Array ( [0] => Dog [1] => Puppy )

[1] => Array ( [0] => Cat [1] => Kitten )

)