Check whether the file or directory has an instance code in PHP

Check whether the file or directory exists, we use PHP commonly used function file_exists, this function can realize I want to function, below everybody slowly reference

The following is an example code that checks whether a file exists:

The code is as follows:

<?php $filename = '/path/to/foo.txt '; if (file_exists ($filename)) {echo "The file $filename exists";} else {echo "The file $filename does not exist";}?>

If the file exists, the execution of the PHP file displays the following results:
The file C:blablaphphello.txt exists.
If the file does not exist, the result of executing the PHP file is:
The file C:\blabla\phphello.txt does not exist.
You can also use the File_exists function to test whether a directory exists, as shown in the sample code:

The code is as follows:

if (file_exists ("C:\blabla\php")) {echo "yes";} else {echo "No";}

Instance

The code is as follows:

/** * File or directory permission check function * * @access public * @param string $file _path file path * @param bool $rename _PRV Check permission to execute rename () function when checking for modify permissions * * @return int return value range is {0 <= x <= 15}, the meaning of each value can be introduced by a combination of four-bit binary numbers. * return value in binary notation, the four-bit high-to-low represents the * executable rename () function permission, the ability to append content to the file, the writable file permission, the readable file permission. */function File_mode_info ($file _path) {/* If not present, unreadable, not writable, not modified */if (!file_exists ($file _path)) {return false;} $mark = 0; if (Strtoupper (substr (php_os, 0, 3)) = = ' WIN ') {/* Test file */$test _file = $file _path. '/cf_test.txt '; /* If the directory */if (Is_dir ($file _path)) {/* Check the directory is readable */$dir = @opendir ($file _path); if ($dir = = = False) {return $mark;//IF Directory Open failed, directly return directory non-modifiable, non-writable, unreadable} if (@readdir ($dir)!== false) {$mark ^= 1;//directory readable 001, directory unreadable} @closedir ($dir); /* Check whether the directory is writable */$fp = @fopen ($test _file, ' WB '); if ($fp = = = False) {return $mark;//If the file creation in the directory fails, the return is not writable. if (@fwrite ($fp, ' Directory Access testing. ')!== false) {$mark ^= 2;//directory writable readable 011, directory writable unreadable 010} @fclose ($FP); @unlink ($test _file); /* Check to see if the directory is modifiable */$fp = @fopen ($test _file, ' ab+ '); if ($fp = = = False) {return $mark;} if (@fwrite ($fp, "Modify Test.rn")!== false) {$mark ^= 4;} @fclose ($FP); /* Check the directory for permissions to execute the rename () function */if (@rename ($test _file, $test _file)!== false) {$mark ^= 8;} @unlink ($test _file); }/* If it is file */ElseIf (Is_file ($file _path)) {/* Read Open */$fp = @fopen ($file _path, ' RB '), if ($fp) {$mark ^= 1;//readable 001 } @fclose ($FP); /* Try to modify the file */$fp = @fopen ($file _path, ' ab+ '); if ($fp && @fwrite ($fp, ')!== false) {$mark ^= 6;//Can be modified to writable readable 111, non-modifiable writable readable 011 ...} @fclose ($FP); /* Check the directory for permissions to execute the rename () function */if (@rename ($test _file, $test _file)!== false) {$mark ^= 8;}} } else {if (@is_readable ($file _path)) {$mark ^= 1;} if (@is_writable ($file _path)) {$mark ^=;}} return $mark; }

PHP determines if a directory exists

The code is as follows:

/**************************************************** * XML data stream, write to XML file * @param $xmlData * @return bool|string * * function Writexmlfile ($xmlData) {$time = time ();//get timestamp for naming the file $path = dirname (file);//Get the current absolute path $path = Substr_replace ($path, "", Stripos ($path, "Actions\data")); Replace the intrinsic path where this file resides with an empty $path. = "Xmlfiles\"; Store Directory Name/* To determine if the target directory exists, not present the new */if (!is_dir ($path)) {mkdir ($path);//New Directory}/* Record the full path and file name */$filePathAndName = $path. $time. " . xml "; /* Open file with file name < timestamp > + <.xml>*/$fp = fopen ($filePathAndName, "w"); if (! $fp) {return false;}/* Write to file stream */$flag = fwrite ($fp, $xmlData); if (! $flag) {return false;} fclose ($FP); return $filePathAndName; }