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@ 2013-04-05T11:36:46Z

<?php
$string = 'pippo ASC, `table`.`pippo` DESC, campo.discendente DESC, `tabella`.`asc` ASC';

$string = preg_replace_callback('#(![\`]+)\b(ASC|DESC)\b#i', function($match) {
                switch(strtoupper($match[1])) {
                    case 'ASC': return 'DESC';
                    case 'DESC': return 'ASC';
                }
            }, $string);


echo $string;

Output
Performance
VLD
References
Branches

preg_replace_callback: documentation ( source)
strtoupper: documentation ( source)

preferences:dark modelive preview

48.17 ms | 402 KiB | 5 Q