(PHP 5, PHP 7) Find the position of the first occurrence of a case-insensitive substring in a string

(PHP 5, PHP 7) Search a string for any of a set of characters

(PHP 4, PHP 5, PHP 7) Set locale information

(PHP 4, PHP 5, PHP 7) Alias of

(PHP 5, PHP 7) Binary safe comparison of two strings from an offset, up to length characters

(PHP 4, PHP 5) Replace regular expression case insensitive

(PHP 4 >= 4.0.1, PHP 5) Split string into array by regular expression case insensitive

(PHP 4, PHP 5, PHP 7) Make a string's first character uppercase

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

(PHP 4 >= 4.0.5, PHP 5, PHP 7) Perform a regular expression search and replace using a callback