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<?php var_dump(NAN == NAN); var_dump(NAN === NAN); var_dump(array(NAN) == array(NAN)); var_dump(array(NAN) === array(NAN)); $a = array(NAN); var_dump($a == $a); var_dump($a === $a); $b = $a; var_dump($a == $b); var_dump($a === $b);
Output for 5.3.15 - 5.3.29, 5.4.5 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.30, 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.5 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.4, 8.3.6
bool(false) bool(false) bool(false) bool(false) bool(true) bool(true) bool(true) bool(true)
Output for 8.3.5
Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 bool(false) bool(false) bool(false) bool(false) bool(true) bool(true) bool(true) bool(true)
Output for 4.3.6 - 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 - 5.3.14, 5.4.0 - 5.4.4
bool(false) bool(false) bool(false) bool(false) bool(false) bool(false) bool(false) bool(false)
Output for 4.3.0 - 4.3.5
Notice: Use of undefined constant NAN - assumed 'NAN' in /in/1d9gn on line 3 Notice: Use of undefined constant NAN - assumed 'NAN' in /in/1d9gn on line 3 bool(true) Notice: Use of undefined constant NAN - assumed 'NAN' in /in/1d9gn on line 4 Notice: Use of undefined constant NAN - assumed 'NAN' in /in/1d9gn on line 4 bool(true) Notice: Use of undefined constant NAN - assumed 'NAN' in /in/1d9gn on line 5 Notice: Use of undefined constant NAN - assumed 'NAN' in /in/1d9gn on line 5 bool(true) Notice: Use of undefined constant NAN - assumed 'NAN' in /in/1d9gn on line 6 Notice: Use of undefined constant NAN - assumed 'NAN' in /in/1d9gn on line 6 bool(true) Notice: Use of undefined constant NAN - assumed 'NAN' in /in/1d9gn on line 7 bool(true) bool(true) bool(true) bool(true)

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