PHP provides a simple implementation method to generate a specified random string. php generates a string.

PHP provides a simple implementation method to generate a specified random string. php generates a string.

This example describes how PHP can generate a specified random string. Share it with you for your reference. The specific analysis is as follows:

This is a simple function that does not forcibly set the generated content. Therefore, when the length of the generated string is small, there will be no specified type of characters. Of course, the modification is also very simple, so we will not add it here.

/*** @ Param string $ type * @ param $ length * @ return string */function randomString ($ type = "number, upper, lower", $ length) {$ valid_type = array ('number', 'uppper ', 'lower'); $ case = explode (",", $ type ); $ count = count ($ case); // determines whether the parameter is valid Based on the intersection. if ($ count! = Count (array_intersect ($ case, $ valid_type) {return false;} $ lower = "abcdefghijklmnopqrstuvwxyz"; $ upper = strtoupper ($ lower ); $ number = "0123456789"; $ str_list = ""; for ($ I = 0; $ I <$ count; ++ $ I) {$ str_list. = $ case [$ I];} return substr (str_shuffle ($ str_list), 0, $ length);} echo randomString ("number, upper, lower", 12 );

I hope this article will help you with php programming.