rand() function is a PHP built-in function that generates a unique number. As the script depends on this unique id for delivering the file (searches the db for this unique id , gets the filename from there and delivers the file). After running the statement above PHP variable "id" will be assigned a unique 32 characters long value. How to Create a Unique String in PHP | Generate a Key | PHP Tutorial | Learn PHP Programming. Use a counter (if you have one) + timestamp (even better if in milliseconds) + some system value (either an IP address or some machine id) + a random integer. In PHP 7.x, there is another powerful and more secure function to generate random alphanumeric string -- random_bytes().It requires only one parameter -- length, and it generates cryptographically secure pseudo-random bytes. Generate Unique Alphanumeric String using random_bytes() function in PHP . Generate ids based on timestamp. Session ID is created according to php.ini settings. It is important to use the same user ID of your web server for GC task script. Security is not focused much here , only the id has to be unique everytime WITHOUT FAIL. session_create_id() is used to create new session id for the current session. If you want to generate a unique number within a range, then define the start and end point of random number. If you define the start and end point, then the unique number will be in between. It returns collision free session id. A PHP example on how to generate a totally unique ID containing letters and/or numbers based on previous entries in a database. As you can see above, we can use uniqid() function in different ways to generate unique id.. The uniqid( ) function in PHP is an inbuilt function which is used to generate a unique ID based on the current time in microseconds (micro time). Approach 3:Using uniqid() function. Everything is fine , but the problem is I am not able to generate the 10 digit unique code. 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