PHP Simple implementation method for generating a specified random string _php tutorial

Simple implementation of PHP to generate a specified random string

The specific analysis is as follows:

This is a simple function that does not force the generated content to be set. So when the resulting string length is small, there is a case where no type character is specified. Of course, the changes are also very simple, here do not add.

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/** * @param string $type * @param $length * @return String */ function RandomString ($type = "Number,upper,lower", $length) { $valid _type = Array (' number ', ' upper ', ' lower '); $case = Explode (",", $type); $count = count ($case); Determine whether a parameter is valid according to 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);

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