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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 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
pippo , `table`.`pippo` , campo.discendente , `tabella`.``
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17
Parse error: syntax error, unexpected T_FUNCTION in /in/ONZuf on line 4
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1, 5.0.0 - 5.0.5
Parse error: parse error, unexpected T_FUNCTION in /in/ONZuf on line 4
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/ONZuf on line 4
Process exited with code 255.
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