array_filter、array_walk、array_map的区别

 

<?php
$arr=array(
1,2,3,4,5,6
);
function filter($var){
    if($var%2==0)
        return true;
}
$data=array_filter($arr,"filter");
$data=array(2,4,6);
?>

<?php
$arr1=array('linux','Php','JAVA');
array_map('strtoupper',$arr1);
?>