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Bugs & Features
<?php var_dump(FILTER_FLAG_IPV6);
Output for 5.2.0 - 7.1.0
int(2097152)
Output for 4.3.0 - 5.1.6
Notice: Use of undefined constant FILTER_FLAG_IPV6 - assumed 'FILTER_FLAG_IPV6' in /in/C4MnU on line 2 string(16) "FILTER_FLAG_IPV6"