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run code in 200+ php & hhvm versions
Bugs & Features
<?php var_dump( substr('abc', 3, 4) , substr('abc', 2, 4) );
Output for 7.0.0 - 7.3.0rc4
string(0) "" string(1) "c"
Output for 4.3.0 - 5.6.28
bool(false) string(1) "c"