PHP の初級レベルの面接の質問: プログラミングに関する質問 (1)

function getExt($url){
   $arr = parse_url($url);
   
   $file = basename($arr['path']);
   $ext = explode(".",$file);
   return $ext[1];
}

function getExt($url) {
    $url = basename($url);
    $pos1 = strpos($url,".");
    $pos2 = strpos($url,"?");
    if(strstr($url,"?")){
         return substr($url,$pos1 + 1,$pos2 - $pos1 - 1);
    } else {
      return substr($url,$pos1);
    }
}

$a = '/a/b/c/d/e.php';
$b = '/a/b/12/34/c.php';

function getRelativePath($a, $b) {   
    $returnPath = array(dirname($b));   
    $arrA = explode('/', $a);   
    $arrB = explode('/', $returnPath[0]);   
    for ($n = 1, $len = count($arrB); $n < $len; $n++) {   
        if ($arrA[$n] != $arrB[$n]) {   
            break;   
        }    
    }   
    if ($len - $n > 0) {   
        $returnPath = array_merge($returnPath, array_fill(1, $len - $n, &#39;..&#39;));   
    }   
       
    $returnPath = array_merge($returnPath, array_slice($arrA, $n));   
    return implode(&#39;/&#39;, $returnPath);   
}   
   echo getRelativePath($a, $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;
     }
}