PHP programmer interview questions (classic summary)

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. Use PHP to write the code to display the client IP and server IP? Answer:

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

Method 2:

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

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

Answer 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. Write a function to calculate the relative paths of two files? For example $a = '/a/b/c/d/e.php'; ​$b = '/a/b/12/34/c.php'; Calculate that the relative path of $b relative to $a should be http://bbs.it-home.org/c/d and add () Answer:

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 );

I hope the above PHP interview questions provided for you will be helpful to you, and I sincerely hope that they can be used in your application.