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@ 2020-07-15T14:31:32Z

<?php

class A {}
class B {}
class C extends A {}

$tests = [
    1 => [new A(), new A()], // succeeds
    2 => [new A(), new B()], // fails
    3 => [new C(), new C()], // succeeds
];


echo 'TEST 1:' . PHP_EOL;
foreach ($tests as $index => $collection) {
    try {
        array_map(static function (A $object): void {}, $collection);
    } catch (\TypeError $e) {
        echo sprintf('Index %d failed, because it doesn\'t contain instances of A only.' . PHP_EOL, $index);
    }
}
echo PHP_EOL;

echo 'TEST 2:' . PHP_EOL;
foreach ($tests as $index => $collection) {
    try {
        array_map(static function (C $object): void {}, $collection);
    } catch (\TypeError $e) {
        echo sprintf('Index %d failed, because it doesn\'t contain instances of C only.' . PHP_EOL, $index);
    }
}

Output for 7.2.0 - 7.2.34, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.28, 8.4.1 - 8.4.14, 8.5.0: TEST 1: Index 2 failed, because it doesn't contain instances of A only. TEST 2: Index 1 failed, because it doesn't contain instances of C only. Index 2 failed, because it doesn't contain instances of C only.
Output for 8.4.15: /bin/php-8.4.15: /usr/lib/libm.so.6: version `GLIBC_2.38' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libm.so.6: version `GLIBC_2.35' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libc.so.6: version `GLIBC_2.34' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libc.so.6: version `GLIBC_2.38' not found (required by /bin/php-8.4.15)
Process exited with code 1.

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