PHP face test file directory operation _php Instance

This problem is not difficult, the test center is mainly in function substr () STRRCHR () Array_pop () Strrpos () Strpos (), Strrev () explode ().

No more nonsense to say, directly to everyone paste code.

Get file suffix, traverse directory hierarchy

/** * 5 ways to get file suffix name * This question is actually the test function substr () STRRCHR () Array_pop () Strrpos () Strpos () Strrev () explode () pathinfo () * @param St Ring $filename filename to process 1.jpg/1.png/1.html/1.php * @return string. php/php/function Get_ext1 ($filename) {return St
RRCHR ($filename, '. '); function Get_ext2 ($filename) {return substr ($filename, Strrpos ($filename, '. '));} function Get_ext3 ($filename) {R
Eturn Array_pop (Explode ('. ', $filename)); function Get_ext4 ($filename) {return pathinfo ($filename, pathinfo_extension);} function Get_ext5 ($filename) {RET
Urn Strrev (substr (Strrev ($filename), 0,strpos (Strrev ($filename), '. '));
} $filename = "1.php"; echo Get_ext1 ($filename). "
\ n "; echo get_ext2 ($filename). "
\ n "; echo Get_ext3 ($filename). "
\ n "; echo Get_ext4 ($filename). "
\ n "; echo Get_ext5 ($filename). "
\ n "; /** * Traversal directory (Recursive) * @param string $dir directory name and last no/* @return array $files The entire directory structure */function Myscandir ($dir) {$files = arr
    Ay (); if ($handle = Opendir ($dir)) {while ($file = Readdir ($handle)!= false) {if ($file!= "." && $file!= "...") {$newDir = $dir. "
                /". $file;
                if (Is_dir ($newDir)) {$files [$file] = Myscandir ($newDir);
                }else{$files [] = $file;
        }} closedir ($handle);
    return $files;
}} $dir = "/dirname"; Print_r (Myscandir ($dir));

The above code is not very simple ah, on these several functions, the function mastered, this problem is very easy to solve, I hope this article to share for everyone to help.