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@ 2013-12-25T23:30:28Z

<?php
$string = '$descriptions.language_id = ? AND (x = true OR $xyz.pippo = ?)';

echo preg_replace_callback('#(\$([a-z0-1\._]+))#i', function($matches) {
    return strtoupper($matches[1]);
}, $string);

Output
Performance
VLD
References
Branches

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

preferences:dark modelive preview

77.25 ms | 402 KiB | 5 Q