To compute the results, just use Melody and run the script:
melody run https://gist.github.com/Pierstoval/ed387a09d4a5e76108e60e8a7585ac2d
Forked from Pierstoval/_PHP is_a() vs is_subclass_of().md
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May 15, 2025 10:20
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`is_a()` vs `is_subclass_of()`
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| <?php | |
| <<<CONFIG | |
| packages: | |
| - "symfony/console: ^4.1" | |
| CONFIG; | |
| use Symfony\Component\Console\Helper\Table; | |
| use Symfony\Component\Console\Helper\TableStyle; | |
| use Symfony\Component\Console\Output\ConsoleOutput; | |
| require __DIR__.'/vendor/autoload.php'; | |
| class A | |
| { | |
| } | |
| class B extends A | |
| { | |
| } | |
| interface It | |
| { | |
| } | |
| trait T { | |
| } | |
| class C extends B implements It { | |
| use T; | |
| } | |
| $classes = [ | |
| 'A', | |
| 'B', | |
| 'It', | |
| 'T', | |
| 'C', | |
| ]; | |
| $rows = []; | |
| foreach ($classes as $class1) { | |
| foreach ($classes as $class2) { | |
| $rows[] = [ | |
| $class1.' of '.$class2, | |
| is_a($class1, $class2, true) ? '<fg=green>true</>' : '<fg=red>false</>', | |
| is_subclass_of($class1, $class2, true) ? '<fg=green>true</>' : '<fg=red>false</>', | |
| ]; | |
| } | |
| } | |
| $table = new Table(new ConsoleOutput()); | |
| $table->setHeaders(['Operation', 'is_a()', 'is_subclass_of()']); | |
| $table->setRows($rows); | |
| $table->render(); |
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| +-----------+--------+------------------+ | |
| | Operation | is_a() | is_subclass_of() | | |
| +-----------+--------+------------------+ | |
| | A of A | true | false | | |
| | A of B | false | false | | |
| | A of It | false | false | | |
| | A of T | false | false | | |
| | A of C | false | false | | |
| | B of A | true | true | | |
| | B of B | true | false | | |
| | B of It | false | false | | |
| | B of T | false | false | | |
| | B of C | false | false | | |
| | It of A | false | false | | |
| | It of B | false | false | | |
| | It of It | true | false | | |
| | It of T | false | false | | |
| | It of C | false | false | | |
| | T of A | false | false | | |
| | T of B | false | false | | |
| | T of It | false | false | | |
| | T of T | true | false | | |
| | T of C | false | false | | |
| | C of A | true | true | | |
| | C of B | true | true | | |
| | C of It | true | true | | |
| | C of T | false | false | | |
| | C of C | true | false | | |
| +-----------+--------+------------------+ |
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