Description

Returns the filename of the next file from the directory. The filenames are returned in the order in which they are stored by the filesystem.

Please note the fashion in which readdir()'s return value is checked in the examples below. We are explicitly testing whether the return value is identical to (equal to and of the same type as--see Comparison Operators for more information) FALSE since otherwise, any directory entry whose name evaluates to FALSE will stop the loop.

// Note that !== did not exist until 4.0.0-RC2
<?php
if ($handle = opendir('/path/to/files')) {
    echo "Directory handle: $handle\n";
    echo "Files:\n";

    /* This is the correct way to loop over the directory. */
    while (false !== ($file = readdir($handle))) { 
        echo "$file\n";
    }

    /* This is the WRONG way to loop over the directory. */
    while ($file = readdir($handle)) { 
        echo "$file\n";
    }

    closedir($handle); 
}
?>

Note that readdir() will return the . and .. entries. If you don't want these, simply strip them out:

<?php 
if ($handle = opendir('.')) {
    while (false !== ($file = readdir($handle))) { 
        if ($file != "." && $file != "..") { 
            echo "$file\n"; 
        } 
    }
    closedir($handle); 
}
?>

Description

Returns a directory handle to be used in subsequent closedir(), readdir(), and rewinddir() calls.

If path is not a valid directory or the directory can not be opened due to permission restrictions or filesystem errors, opendir() returns FALSE and generates a PHP error. You can suppress the error output of opendir() by prepending `@' to the front of the function name.

<?php

if ($dir = @opendir("/tmp")) {
  while (($file = readdir($dir)) !== false) {
    echo "$file\n";
  }  
  closedir($dir);
}

?>

Description

fwrite() writes the contents of string to the file stream pointed to by fp. If the length argument is given, writing will stop after length bytes have been written or the end of string is reached, whichever comes first.

fwrite() returns the number of bytes written, or -1 on error.

Note that if the length argument is given, then the magic_quotes_runtime configuration option will be ignored and no slashes will be stripped from string.

Description

The file pointed to by fp is closed.

Returns TRUE on success, FALSE on failure.

The file pointer must be valid, and must point to a file successfully opened by fopen() or fsockopen().

파일을 닫는 함수.

파일 컨트롤 시 꼭 필요한 함수 이다.