php alphanumeric

Now start to generate a variety of PHP verification code journey, novice to drive, please swipe!First of all, let's start mister into a background image with a CAPTCHANote: There is no imagejpg () function, only the imagepng ()

such as: $str = "How does PHP divide 322 of the alphanumeric SF f45d and Chinese in the string?" "; Divide by numbers or letters. $str = "How does PHP divide 322 alphanumeric asf f45d and Chinese _ in a string?" "; $arr = Preg_split ("/([a-za-z0-9]

For example: $str = "How does PHP divide 322 of the alphanumeric characters in the string into SF f45d and Chinese _?" "; Divide by number or letter. Copy Code code as follows: $str = "How does PHP divide the alphanumeric f45d and Chinese

This article mainly introduces the PHP is only reserved Chinese characters alphanumeric, has a certain reference value, now share to everyone, have the need for friends can refer to PHP only keeps Chinese characters alphanumeric All Chinese and

Php generates 12-digit, unique-digit, and alphanumeric member card numbers without querying the database. when each member logs in, a unique membership card number is generated. Share to: more --- php generates 12-digit non-repeating alphanumeric

Php generates 12-digit, unique-digit, and alphanumeric member card numbers without querying the database. when each member logs in, a unique membership card number is generated. Share to: more php generate 12-digit non-repeating alphanumeric

Original sourceIf there is a string of letters and numbers in the case of Chinese mixed, how can they be separated, after some thought, got the following code, share to everyonesuch as: $str = "How does PHP divide 322 of the alphanumeric SF f45d and

Copy CodeThe code is as follows: /** Captcha Class base on PHP GD Lib* @author Design* @version 1.0* @demo* Include (' captchaclass.php ');* $captchaDemo =new Captcha ();* $captchaDemo->createimage ();*/Class captcha{@ Define CAPTCHA Picture

In the actual project development often encounter verification code problems, such as landing page, Message page, registration page ... The principle of verification code is very simple: the use of the GD library to create a picture, the image of

English with numbers Header ("Content-type:image/png"); Define header, declare picture file, preferably PNG, no copyright disturbance; Generate a new four-bit integer verification code Session_Start ();//open session; $authnum _session = "; $str = '