3v4l.org

run code in 300+ PHP versions simultaneously
<?php echo "Compare non numeric string to string 0: ('str' == '0') = " . ('str' == '0' ? 'true' : 'false') . "\n"; echo "Compare non numeric string to integer 0: ('str' == 0) = " . ('str' == 0 ? 'true' : 'false') . "\n"; echo "What are numeric strings: ('1string' == '1') = " . ('1string' == '1' ? 'true' : 'false') . "\n"; echo "Compare two numeric strings (same semantic 1): ('1e1' == '10') = " . ('1e1' == '10' ? 'true' : 'false') . "\n"; echo "Compare two numeric strings (same semantic 2): ('1E1' == '10') = " . ('1E1' == '10' ? 'true' : 'false') . "\n"; echo "Compare two numeric strings (same semantic 3): ('1e-1' == '0.1') = " . ('1e-1' == '0.1' ? 'true' : 'false') . "\n"; echo "Compare two numeric strings (same semantic 4): ('1E-1' == '0.1') = " . ('1E-1' == '0.1' ? 'true' : 'false') . "\n"; echo "Compare two numeric strings (same semantic 5): ('+1' == '1') = " . ('+1' == '1' ? 'true' : 'false') . "\n"; echo "Compare two numeric strings (same semantic 6): ('+0' == '-0') = " . ('+0' == '-0' ? '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 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
Compare non numeric string to string 0: ('str' == '0') = false Compare non numeric string to integer 0: ('str' == 0) = false What are numeric strings: ('1string' == '1') = false Compare two numeric strings (same semantic 1): ('1e1' == '10') = true 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 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.7 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33
Compare non numeric string to string 0: ('str' == '0') = false Compare non numeric string to integer 0: ('str' == 0) = true What are numeric strings: ('1string' == '1') = false Compare two numeric strings (same semantic 1): ('1e1' == '10') = true 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

preferences:
225.63 ms | 406 KiB | 326 Q