Php is an example of a random Print Output string.

Php is an example of a random Print Output string.

<? Phpheader ("Content-type: text/html; charset = 'utf8'"); error_reporting (E_ALL); define ("CAPTCHA_LEN", 16 ); // length of a random number $ captchaSource = "0123456789abcdefghijklmnopqrstuvwxyz this is an example of a random Print Output string"; // random number character source $ captchaResult = ""; // the random number returned value is CAPTCHAs ""; // random number intermediate variable for ($ I = 0; $ I <CAPTCHA_LEN; $ I ++) {$ n = rand (0, strlen ($ captchaSource )); if ($ n> = 36) {$ n = 36 + ceil ($ n-36)/3) * 3; $ captchaResult. = substr ($ captchaSource, $ n, 3);} else {$ captchaResult. = substr ($ captchaSource, $ n, 1) ;}} echo "random Print Output string :". $ captchaResult. "<br> ";