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<?php class Foo { public $parent; } $a = new Foo(); $a->parent = new stdClass(); $a->parent->x = [$a]; print_r($a); $arr = [ [$a], $a, ]; print_r($arr);
Output for 8.2.0 - 8.2.29, 8.3.0 - 8.3.28, 8.4.1 - 8.4.14, 8.5.0
Foo Object ( [parent] => stdClass Object ( [x] => Array ( [0] => Foo Object *RECURSION* ) ) ) Array ( [0] => Array ( [0] => Foo Object ( [parent] => stdClass Object ( [x] => Array ( [0] => Foo Object *RECURSION* ) ) ) ) [1] => Foo Object ( [parent] => stdClass Object ( [x] => Array ( [0] => Foo Object *RECURSION* ) ) ) )
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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