PHP learning notes: universal random string generation function (encapsulated), php learning notes

PHP learning notes: universal random string generation function (encapsulated), php learning notes

The verification code is used, and then the function is encapsulated. You need to set two parameters when using the function:

$ Str: the string to be collected, for example:

$ Str = 'efasfgzsrhftjxjxjhsrth ';

Then the string generated in the function will be randomly crawled from efasfgzsrhftjxjhsrth;

$ CodeLen: Specifies the random string to be generated. If it is set to 5, five random strings are generated.

 

Principle: Randomly capture and splice strings

Effect:

Code:

<? Php // mt_rand obtain the random number mt_rand (min, max); $ str = "random"; // set the string to be randomly collected $ codeLen = '5 '; // set the number of random numbers generated function str_rand ($ str, $ codeLen) {$ rand = ""; for ($ I = 0; $ I <$ codeLen-1; $ I ++) {$ rand. = $ str [mt_rand (0, strlen ($ str)-1)]; // For example, if the random number is 30, return $ rand ;} $ code = str_rand ($ str, $ codeLen); echo $ code;
?>