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<?php interface I {} class A implements I {} class B implements I {} $a = new A(); function doWork(I $i) { $carry = []; // from array_reduce, not relevant [$key, $value] = match (true) { $i instanceof A => ['a', []], // default is not handled //true => ['oops', []], }; $carry[$key] = $value; return $carry; } var_dump(doWork($a));
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.34, 8.3.0 - 8.3.4, 8.3.6 - 8.3.35, 8.4.1 - 8.4.26, 8.5.0 - 8.5.11
array(1) { ["a"]=> array(0) { } }
Output for 7.3.13 - 7.3.33, 7.4.0 - 7.4.33
Parse error: syntax error, unexpected '=>' (T_DOUBLE_ARROW) in /in/KrlXs on line 14
Process exited with code 255.
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 array(1) { ["a"]=> array(0) { } }

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