zerolab

<?php

//Quotes: Replace smart double quotes with straight double quotes.
//ANSI version for use with 8-bit regex engines and the Windows code page 1252.
preg_replace('[\x84\x93\x94]', '"', $text);

//Quotes: Replace smart double quotes with straight double quotes.
//Unicode version for use with Unicode regex engines.
preg_replace('[\u201C\u201D\u201E\u201F\u2033\u2036]', '"', $text);