(PHP 5 >= 5.2.0, PHP 7) Finds first occurrence of a string within another
(PHP 4 >= 4.0.6, PHP 5, PHP 7) Find position of last occurrence of a string in a string
(PHP 4 >= 4.2.0, PHP 5, PHP 7) Setup string and regular expression for a multibyte regular expression match
(PHP 4 >= 4.0.6, PHP 5, PHP 7) Set/Get internal character encoding
(PHP 4 >= 4.2.0, PHP 5, PHP 7) Multibyte regular expression match for predefined multibyte string
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