(PHP 4, PHP 5) Case insensitive regular expression match

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

(PHP 4, PHP 5, PHP 7) Output a string int print

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

(PHP 4, PHP 5, PHP 7) Find the first occurrence of a string

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

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

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

(PHP 4, PHP 5, PHP 7) Make a string lowercase

(PHP 4, PHP 5, PHP 7) Return information about characters used in a string