(PHP 4, PHP 5, PHP 7) Finds the length of the initial segment of a string consisting entirely of characters

(PECL ssdeep >= 1.0.0) Create a fuzzy hash from a string

(PHP 4, PHP 5, PHP 7) Find the last occurrence of a character in a string

(PHP 7) Perform a regular expression search and replace using callbacks

(PHP 4, PHP 5, PHP 7) Binary safe case-insensitive string comparison

(PHP 4, PHP 5, PHP 7) Uppercase the first character of each word in a string

(PHP 4, PHP 5) Make regular expression for case insensitive match

(PHP 4, PHP 5, PHP 7) Format a number with grouped thousands

(PECL bbcode >= 0.9.0) Parse a string following a given rule set

(PHP 4, PHP 5, PHP 7) Perform a regular expression match