php程式設計師面試題(經典總結)

function GBsubstr($string, $start, $length) {
    if(strlen($string)>$length){
     $str=null;
     $len=$start+$length;
     for($i=$start;$i<$len;$i++){
    if(ord(substr($string,$i,1))>0xa0){
     $str.=substr($string,$i,2);
     $i++;
    }else{
     $str.=substr($string,$i,1);
     }
    }
   return $str.'...';
    }else{
   return $string;
   }
}

2.用PHP写出显示客户端IP与服务器IP的代码? 答:

  $readcontents = fopen("http://bbs.it-home.org/index.html", "rb");
   $contents = stream_get_contents($readcontents);
   fclose($readcontents);
   echo $contents;

方法2:

function getExt($url){
   $arr = parse_url($url);

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

答案2:

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);
    }
}

19. 写一个函数，算出两个文件的相对路径? 　　如 $a = '/a/b/c/d/e.php'; 　　$b = '/a/b/12/34/c.php'; 　　计算出 $b 相对于 $a 的相对路径应该是 http://bbs.it-home.org/c/d将()添上 答:

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, '..'));
    }

    $returnPath = array_merge($returnPath, array_slice($arrA, $n));
    return implode('/', $returnPath);
   }
   echo getRelativePath($a, $b);

希望以上为大家提供的php面试题，对大家有所帮助，真诚期待在您的应聘中可以用得上。