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<?php //simulatiing a similar situation class PDO2{} class DB{ public static function connection(){ //I know it's not something like this, but that isn't what we're concerned here return new class { public function getPdo(){ return new PDO2(); } }; } }; class Test { protected $pdo; public function __construct(PDO2 $pdo) { $this->pdo = $pdo; } } var_dump(new Test($pdo = DB::connection()->getPdo()));
Output for 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 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
object(Test)#1 (1) { ["pdo":protected]=> object(PDO2)#3 (0) { } }
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 object(Test)#1 (1) { ["pdo":protected]=> object(PDO2)#3 (0) { } }

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