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<?php $condition = ['one', 'two']; $key = key($condition); echo "The key is: " . $key . PHP_EOL; echo 'Without strict comparison:' . PHP_EOL; var_dump(in_array($key, ['a', 'b'])); echo 'With strict comparison:' . PHP_EOL; var_dump(in_array($key, ['a', 'b'], true)); echo 'Non-strict comparison of string to zero:' . PHP_EOL; var_dump(0 == 'a');
Output for 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
The key is: 0 Without strict comparison: bool(false) With strict comparison: bool(false) Non-strict comparison of string to zero: bool(false)
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 The key is: 0 Without strict comparison: bool(false) With strict comparison: bool(false) Non-strict comparison of string to zero: bool(false)
Output for 5.6.0 - 5.6.26, 7.0.0 - 7.0.3, 7.0.5 - 7.0.20, 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33
The key is: 0 Without strict comparison: bool(true) With strict comparison: bool(false) Non-strict comparison of string to zero: bool(true)
Output for 7.0.4

Process exited with code 137.
preferences:
147 ms | 401 KiB | 188 Q