Three methods for generating unique IDs in php and three phpid_PHP tutorials

Three php methods for generating unique IDs and three phpid methods. Three methods for generating a unique id for php, and three methods for generating a unique id for php are found in many articles on the Internet, this article will share with you how php generates the only three methods for generating unique php IDs and three methods for generating unique php IDs.

I checked many articles on the Internet about the unique id generation method of php and found many methods. I would like to share with you the solution to the unique id generation in php.

1. md5 (time (). mt_rand (1,000000 ));

There is a probability that this method will be repeated.

2. php built-in function uniqid ()

The uniqid () function generates a unique ID based on the current time in microseconds.

W3school reference manual has one sentence: "Because the system time is based, the ID generated through this function is not the best. To generate an absolutely unique ID, use the md5 () function ".

The returned result of the following method is similar to: 5ddb417f-4389-f4a9-a100-501ef1348872.

Function uuid () {if (function_exists ('com _ create_guid ') {return com_create_guid () ;}else {mt_srand (double) microtime () * 10000 ); // optional for php 4.2.0 and up. no need to sow data as needed after 4.2.0. $ Charid = strtoupper (md5 (uniqid (rand (), true); // generate a unique id based on the current time (in microseconds. $ hyphen = chr (45); // "-" $ uuid = ''. // chr (123) // "{" substr ($ charid, 0, 8 ). $ hyphen. substr ($ charid, 8, 4 ). $ hyphen. substr ($ charid, 12, 4 ). $ hyphen. substr ($ charid, 16, 4 ). $ hyphen. substr ($ charid, 20, 12 );//. chr (125); // "}" return $ uuid ;}}

Com_create_guid () is the unique id method generated by php. it seems that php5 does not exist.
3. the official uniqid () reference manual has a user-provided method, the results are similar to: {E2DFFFB3-571E-6CFC-4B5C-9FEDAAF2EFD7}

public function create_guid($namespace = '') {    static $guid = '';  $uid = uniqid("", true);  $data = $namespace;  $data .= $_SERVER['REQUEST_TIME'];  $data .= $_SERVER['HTTP_USER_AGENT'];  $data .= $_SERVER['LOCAL_ADDR'];  $data .= $_SERVER['LOCAL_PORT'];  $data .= $_SERVER['REMOTE_ADDR'];  $data .= $_SERVER['REMOTE_PORT'];  $hash = strtoupper(hash('ripemd128', $uid . $guid . md5($data)));  $guid = '{' .       substr($hash, 0, 8) .      '-' .      substr($hash, 8, 4) .      '-' .      substr($hash, 12, 4) .      '-' .      substr($hash, 16, 4) .      '-' .      substr($hash, 20, 12) .      '}';  return $guid; }

The above are three solutions for generating a unique id in php, and hope to help you learn.

I have checked many articles on the Internet about the unique id generation method of php and found many methods. I would like to share this article with you how to generate the unique id of php...