php replace ' character

how can i replace开发者_JS百科 the ' character in php to - in order to save it to mysql database?

Use mysql_real_escape_string() !! And remember this function like FOREVER

Use parameterized queries.

Use mysql_real_escape_string($string).

Documentation can be found here: http://php.net/manual/en/function.mysql-real-escape-string.php