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<?php // conversion btw boolean and string values var_dump("", $b = (bool)"", (string) $b); echo "\n"; var_dump("0", $b = (bool)"0", (int)$b, (string)(int) $b);
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
string(0) "" bool(false) string(0) "" string(1) "0" bool(false) int(0) string(1) "0"