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@ 2016-07-21T12:23:02Z

<?php

preg_replace('~(?>[\pZ\pC]+)$~u', '', str_repeat("\u{2029}", 20000) .  'x');

Output
Performance
VLD
References
Branches

str_repeat: documentation ( source)
preg_replace: documentation ( source)

preferences:dark modelive preview

53.77 ms | 402 KiB | 5 Q