3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php echo "Compare two numeric strings (same semantic 1): ('1e1' == '10') = " . (NAN == 0 ? 'true' : 'false') . "\n"; echo "Compare two numeric strings (same semantic 2): ('1E1' == '10') = " . (NAN > 1 ? 'true' : 'false') . "\n"; echo "Compare two numeric strings (same semantic 3): ('1e-1' == '0.1') = " . (NAN < 1 ? 'true' : 'false') . "\n"; echo "Compare two numeric strings (same semantic 4): ('1E-1' == '0.1') = " . (NAN < -1 ? 'true' : 'false') . "\n"; echo "Compare two numeric strings (same semantic 5): ('+1' == '1') = " . (NAN > -1 ? 'true' : 'false') . "\n"; echo "Compare two numeric strings (same semantic 6): ('+0' == '-0') = " . (NAN > -1 ? 'true' : 'false') . "\n"; echo "Compare two numeric strings (precision 1): ('0.99999999999999994' == '1') = " . ('0.99999999999999994' == '1' ? 'true' : 'false') . "\n"; echo "Compare two numeric strings (precision 2): ('0.99999999999999995' == '1') = " . ('0.99999999999999995' == '1' ? 'true' : 'false') . "\n";
Output for 4.3.6 - 5.3.29, 7.0.0 - 7.1.0
Compare two numeric strings (same semantic 1): ('1e1' == '10') = false Compare two numeric strings (same semantic 2): ('1E1' == '10') = true Compare two numeric strings (same semantic 3): ('1e-1' == '0.1') = true Compare two numeric strings (same semantic 4): ('1E-1' == '0.1') = true Compare two numeric strings (same semantic 5): ('+1' == '1') = true Compare two numeric strings (same semantic 6): ('+0' == '-0') = true Compare two numeric strings (precision 1): ('0.99999999999999994' == '1') = false Compare two numeric strings (precision 2): ('0.99999999999999995' == '1') = true
Output for 5.4.0 - 5.6.28, hhvm-3.10.0 - 3.12.0
Compare two numeric strings (same semantic 1): ('1e1' == '10') = false Compare two numeric strings (same semantic 2): ('1E1' == '10') = false Compare two numeric strings (same semantic 3): ('1e-1' == '0.1') = false Compare two numeric strings (same semantic 4): ('1E-1' == '0.1') = false Compare two numeric strings (same semantic 5): ('+1' == '1') = false Compare two numeric strings (same semantic 6): ('+0' == '-0') = false Compare two numeric strings (precision 1): ('0.99999999999999994' == '1') = false Compare two numeric strings (precision 2): ('0.99999999999999995' == '1') = true
Output for 4.3.0 - 4.3.5
Notice: Use of undefined constant NAN - assumed 'NAN' in /in/eSLb7 on line 2 Compare two numeric strings (same semantic 1): ('1e1' == '10') = true Notice: Use of undefined constant NAN - assumed 'NAN' in /in/eSLb7 on line 3 Compare two numeric strings (same semantic 2): ('1E1' == '10') = false Notice: Use of undefined constant NAN - assumed 'NAN' in /in/eSLb7 on line 4 Compare two numeric strings (same semantic 3): ('1e-1' == '0.1') = true Notice: Use of undefined constant NAN - assumed 'NAN' in /in/eSLb7 on line 5 Compare two numeric strings (same semantic 4): ('1E-1' == '0.1') = false Notice: Use of undefined constant NAN - assumed 'NAN' in /in/eSLb7 on line 6 Compare two numeric strings (same semantic 5): ('+1' == '1') = true Notice: Use of undefined constant NAN - assumed 'NAN' in /in/eSLb7 on line 7 Compare two numeric strings (same semantic 6): ('+0' == '-0') = true Compare two numeric strings (precision 1): ('0.99999999999999994' == '1') = false Compare two numeric strings (precision 2): ('0.99999999999999995' == '1') = true