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run code in 150+ php & hhvm versions
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<?php var_dump(" 4" + 0," 4" + 0); var_dump(" 4 "," 4 ");
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
int(4) int(4) string(4) " 4 " string(6) " 4 "