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<?php
$foo = "0123456789a123456789b123456789c";

var_dump(strrpos($foo, '7', -5));  // Starts looking backwards five positions
                                   // from the end. Result: int(17)

var_dump(strrpos($foo, '7', 20));  // Starts searching 20 positions into the
                                   // string. Result: int(27)

var_dump(strrpos($foo, '7', 28));  // Result: bool(false)
?>