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<?php echo "0 == null\n"; var_dump(0 == null); echo "\n'0' == null\n"; var_dump('0' == null); echo "\n0 === null\n"; var_dump(0 === null);
Output for 4.3.0 - 7.2.0
0 == null bool(true) '0' == null bool(false) 0 === null bool(false)