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<?php $valid_strings = array("<p>","&nbsp;","</p>"); $test1 = "<p>asdasdasdasdasdasdasd</p>"; $test2 = "<p>&nbsp;&nbsp;&nbsp;&nbsp;</p>"; echo ContainsAnythingElseThan($test1,$valid_strings); echo ContainsAnythingElseThan($test2,$valid_strings); function ContainsAnythingElseThan($the_string,$the_valid_strings_array) { echo "<br>".str_replace($the_valid_strings_array,"",$the_string); }
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.8 - 5.6.28, 7.0.0 - 7.0.20, 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 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
<br>asdasdasdasdasdasdasd<br>

preferences:
262.97 ms | 405 KiB | 353 Q