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run code in 150+ php & hhvm versions
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<?php $_POST['keywords']="sample products!\@, products#$#\, sample"; $keywords = preg_replace("/\g/", ',',($_POST['keywords'])); echo $keywords;
Output for 4.4.9, 5.2.7 - 7.1.0
Warning: preg_replace(): Compilation failed: a numbered reference must not be zero at offset 1 in /in/oI4FQ on line 3
Output for 5.2.5 - 5.2.6
Warning: preg_replace(): Compilation failed: \g is not followed by a braced name or an optionally braced non-zero number at offset 1 in /in/oI4FQ on line 3
Output for 5.2.4
Warning: preg_replace(): Compilation failed: \g is not followed by a braced name or an optionally braced non-zero number at offset 0 in /in/oI4FQ on line 3
Output for 4.4.6 - 4.4.8, 5.2.2 - 5.2.3
Warning: preg_replace(): Compilation failed: \g is not followed by an (optionally braced) non-zero number at offset 0 in /in/oI4FQ on line 3
Output for 4.3.0 - 4.4.5, 5.0.0 - 5.2.1
sample products!\@, products#$#\, sample