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

This article mainly introduces the simple implementation of PHP to generate the specified random string, involving PHP operation array and string skills, with a certain reference value, the need for friends can refer to the following

This article describes a 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.

/** * @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);  Determines whether the argument is valid if  ($count!== count (Array_intersect ($case, $valid _type)) {    return false;  }  according to the intersection) $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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