PHP: a simple way to generate a specified random string

PHP provides a simple implementation method to generate a specified random string. The simple implementation method for PHP to generate a specified random string is analyzed as follows: this is a simple function and the generated content is not forcibly set. Therefore, the length of the generated string is simpler than that of the PHP to generate the specified random string.

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.

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/** * @ 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 ); // Determine 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 );

The specific analysis of struct is as follows: this is a simple function and does not force set the generated content. Therefore, the length of the generated string is greater than that of the string...