note 51825 added to features.file-upload

The best way of getting unique filenames, in order to prevent accidental file overwriting during e.g. upload is to use functions: - uniqid - time - md5 It is not recommended to use just time() function. The example code will explain. The code: <?php for( $i = 0; $i < 10; $i++ ) echo 'Time: '.time().' ID: '.md5(uniqid(time())).".\n"; ?> Example output: Time: 1113310579 ID: 79955ae9bc455a33aed92de6b83e1a4a. Time: 1113310579 ID: 45de8a2173b53c33659cafa1d564f49a. Time: 1113310579 ID: 9377a0e655efd206ca5583b6530706cd. Time: 1113310579 ID: 06a86b2c9678adb7f222984019a14c10. Time: 1113310579 ID: 25fe1664af35ebb3347f04cf703be968. Time: 1113310579 ID: dca7397eb4d7d5c44e34b0a16a6fc89e. Time: 1113310579 ID: fa01b6a2a83fbaefd89306d27835101f. Time: 1113310579 ID: cf20ada42f2248c3c8b67f46b1d97401. Time: 1113310579 ID: 9ab1a24c7f576fe0e6add43b848660ac. Time: 1113310579 ID: c6aa6e9e314b4392c94432ece411824e. The ids are unique and this is what we want. Now just append or prepend this id to the original filename and we have unique filename every time. Example: <?php $unique_id = md5(uniqid(time())); $filename = $unique_id.'_'.$filename; ?> ---- Manual Page -- http://www.php.net/manual/en/features.file-upload.php Edit -- http://master.php.net/manage/user-notes.php?action=edit+51825 Delete: added to the manual -- http://master.php.net/manage/user-notes.php?action=delete+51825&report=yes&reason=added+to+the+manual Delete: bad code -- http://master.php.net/manage/user-notes.php?action=delete+51825&report=yes&reason=bad+code Delete: spam -- http://master.php.net/manage/user-notes.php?action=delete+51825&report=yes&reason=spam Delete: useless -- http://master.php.net/manage/user-notes.php?action=delete+51825&report=yes&reason=useless Delete: other reasons -- http://master.php.net/manage/user-notes.php?action=delete+51825&report=yes Reject -- http://master.php.net/manage/user-notes.php?action=reject+51825&report=yes Search -- http://master.php.net/manage/user-notes.php