php 常见面试题（3）

function wpjam_array_push($array, $data=null, $key=false){
    $data  = (array)$data;
 
    $offset  = ($key===false)?false:array_search($key, array_keys($array));
    $offset  = ($offset)?$offset:false;
    if($offset){
        return array_merge(
            array_slice($array, 0, $offset),
            $data,
            array_slice($array, $offset)
        );
    }else{  // 没指定 $key 或者找不到，就直接加到末尾
        return array_merge($array, $data);
    }
}

$data = array("d"=>‘d‘);
$b = wpjam_array_push($a,$data,"b");
print_r($b);

function my_scandir($dir)  
{  
    $files = array();  
    if ( $handle = opendir($dir) ) { 
        while ( ($file = readdir($handle)) !== false ) {  
            if ( $file != ".." && $file != "." ) {  
                if ( is_dir($dir . "/" . $file) ) {  
                    $files[$file] = scandir($dir . "/" . $file);  
                }else {  
                    $files[] = $file;  
                }  
            }  
        }  
        closedir($handle);  
        return $files;  
    }  
}

$files=my_scandir(‘E:\PhpStudy\WWW\12_twleve_month\8-2‘);
echo "<pre>";
print_r($files); 

class DuiLie {

    private $array = array();//声明空数组
 
    public function setFirst($item){

        return array_unshift($this->array,$item);//头入列
    }

    public function delFirst(){

        return array_shift($this->array);//头出列
    }
 
    public function setLast($item){ 

        return array_push($this->array,$item);//尾入列
    }

    public function delLast(){

        return array_pop($this->array,$item);//尾出列
    }

    public function show(){

        var_dump($this->array);//打印数组
    }

    public function Del(){

        unset($this->array);//清空数组
    }
}