(PHP 4 >= 4.3.0, PHP 5, PHP 7) Make a string lowercase
(PHP 4 >= 4.0.6, PHP 5, PHP 7) Get part of string
(PHP 4 >= 4.0.6, PHP 5, PHP 7) Find position of first occurrence of string in a string
(PHP 5 >= 5.2.0, PHP 7) Finds position of first occurrence of a string within another, case insensitive
(PHP 4 >= 4.4.3, PHP 5 >= 5.1.3, PHP 7) Check if the string is valid for the specified encoding
(PHP 5 >= 5.2.0, PHP 7) Finds the last occurrence of a character in a string within another
(PHP 4 >= 4.0.6, PHP 5, PHP 7) Set/Get current language
(PHP 4 >= 4.3.0, PHP 5, PHP 7) Count the number of substring occurrences
(PHP 4 >= 4.2.0, PHP 5, PHP 7) Set start point of next regular expression match
(PHP 4 >= 4.2.0, PHP 5, PHP 7) Replace regular expression with multibyte support
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