PHP数组元素的回调处理,用for()循环来遍历数组

$arr=[3,0,'',15,null,100,false,'php'];
echo '原始数组',var_export($arr,true),',共有:',count($arr),'个元素';
$arr1=array_filter($arr);
echo '新数组',var_export($arr1,true),',共有:',count($arr1),'个元素';

$arr2=['name','password','static'];
$arr3=array_filter($arr2,function ($value){
    return $value !== 'password';
});
echo var_export($arr3);

$arr=['name'=>'张三','password'=>'php123','email'=>'xinz56@qq.com'];
echo var_export($arr,true);

格式化

array_walk($arr,function (&$value,$key ){
    echo $key.':'.$value;
});

array_walk($arr,function (&$value,$key,$name){
    if($value!==$name){
        exit('你不是管理员');
    }else{
        exit($key.':'.$value);
    }
},'李四');

$content=['张三','php123','xinz56.com'];
$rel='';
for ($i=0;$i<count($content);$i++)
{
    $rel .=$content.'---';
}
echo rtrim($rel,'---');