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<?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 for git.master, git.master_jit, rfc.property-hooks
pippo ASC, `table`.`pippo` DESC, campo.discendente DESC, `tabella`.`asc` ASC

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