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run code in 150+ php & hhvm versions
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<?php $r = strftime(str_repeat("x", 4000), time()); if (is_string($r)) { var_dump("string:" . strlen($r)); } else { var_dump($r); }
based on PWe55
Output for 5.5.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
string(11) "string:4000"
Output for 4.3.0 - 5.4.45
bool(false)