(PHP 4, PHP 5, PHP 7) Binary safe case-insensitive string comparison
(PHP 5 >= 5.3.0, PHP 7) Convert a 8 bit string to a quoted-printable string
(PHP 4, PHP 5, PHP 7) Return part of a string
(PHP 4 >= 4.0.5, PHP 5, PHP 7) Get numeric formatting information
(PHP 4, PHP 5, PHP 7) Find the first occurrence of a string
(PHP 5, PHP 7) Find the position of the last occurrence of a case-insensitive substring in a string
(PHP 4 >= 4.3.0, PHP 5, PHP 7) Calculate the sha1 hash of a string
(PHP 4 >= 4.0.1, PHP 5, PHP 7) Pad a string to a certain length with another string
(PHP 4, PHP 5, PHP 7) Reverse a string string
(PHP 4, PHP 5, PHP 7) Convert all applicable characters to HTML entities
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