integer RANDOM_ALNUM

public static increment (mixed $str, [mixed $separator]) Adds a number to a string or increment that number

public static underscore (mixed $text) Makes a phrase underscored instead of spaced

public static startsWith (mixed $str, mixed $start, [mixed $ignoreCase]) Check if a string starts

public static random ([mixed $type], [mixed $length]) Generates a random string based on the given type.

Source on

integer RANDOM_ALPHA

public static lower (mixed $str, [mixed $encoding]) Lowercases a string, this function makes use of the mbstring

public static camelize (mixed $str, [mixed $delimiter]) Converts strings to camelize style

integer RANDOM_NOZERO