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Bugs & Features
<?php function which_is_lower($a, $b) { if ( $a < $b ) { return $a; } else { return $b; } } function compare_comparisons($a, $b) { echo 'min() gives: '; var_dump( min($a, $b) ); echo 'comparison with < gives: '; var_dump( which_is_lower($a, $b) ); } echo "\n", '-1 vs NULL: ', "\n"; compare_comparisons(-1, NULL); echo "\n", '1 vs NULL: ', "\n"; compare_comparisons(1, NULL); echo "\n", '-1 vs FALSE: ', "\n"; compare_comparisons(-1, FALSE); echo "\n", '1 vs FALSE: ', "\n"; compare_comparisons(1, FALSE); echo "\n", '-1 vs TRUE: ', "\n"; compare_comparisons(-1, TRUE); echo "\n", '1 vs TRUE: ', "\n"; compare_comparisons(1, TRUE);
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
-1 vs NULL: min() gives: NULL comparison with < gives: NULL 1 vs NULL: min() gives: NULL comparison with < gives: NULL -1 vs FALSE: min() gives: bool(false) comparison with < gives: bool(false) 1 vs FALSE: min() gives: bool(false) comparison with < gives: bool(false) -1 vs TRUE: min() gives: int(-1) comparison with < gives: bool(true) 1 vs TRUE: min() gives: int(1) comparison with < gives: bool(true)