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run code in 150+ php & hhvm versions
Bugs & Features
<?php var_dump(substr('', 0, 2)); var_dump(substr('a', 0, 2)); var_dump(substr('ab', 0, 2)); var_dump(substr('abc', 0, 2)); var_dump(substr('', -2)); var_dump(substr('a', -2)); var_dump(substr('ab', -2)); var_dump(substr('abc', -2));
Output for 7.0.0 - 7.1.0
string(0) "" string(1) "a" string(2) "ab" string(2) "ab" string(0) "" string(1) "a" string(2) "ab" string(2) "bc"
Output for 4.3.0 - 5.2.1, 5.2.7 - 5.6.28, hhvm-3.12.0
bool(false) string(1) "a" string(2) "ab" string(2) "ab" bool(false) string(1) "a" string(2) "ab" string(2) "bc"
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.2.2 - 5.2.6
bool(false) string(1) "a" string(2) "ab" string(2) "ab" bool(false) bool(false) string(2) "ab" string(2) "bc"