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<?php spl_autoload_register(function () { var_dump('Triggered'); }); try { new Foo(); } catch(Throwable $t) { var_dump($t); } try { new Foo(); } catch(Throwable $t) { var_dump($t); }
Output for 8.0.0 - 8.0.10, 8.1rc1
string(9) "Triggered" object(Error)#2 (7) { ["message":protected]=> string(21) "Class "Foo" not found" ["string":"Error":private]=> string(0) "" ["code":protected]=> int(0) ["file":protected]=> string(9) "/in/UYSmq" ["line":protected]=> int(8) ["trace":"Error":private]=> array(0) { } ["previous":"Error":private]=> NULL } string(9) "Triggered" object(Error)#3 (7) { ["message":protected]=> string(21) "Class "Foo" not found" ["string":"Error":private]=> string(0) "" ["code":protected]=> int(0) ["file":protected]=> string(9) "/in/UYSmq" ["line":protected]=> int(14) ["trace":"Error":private]=> array(0) { } ["previous":"Error":private]=> NULL }
Output for 7.3.0 - 7.3.30, 7.4.0 - 7.4.23
string(9) "Triggered" object(Error)#2 (7) { ["message":protected]=> string(21) "Class 'Foo' not found" ["string":"Error":private]=> string(0) "" ["code":protected]=> int(0) ["file":protected]=> string(9) "/in/UYSmq" ["line":protected]=> int(8) ["trace":"Error":private]=> array(0) { } ["previous":"Error":private]=> NULL } string(9) "Triggered" object(Error)#3 (7) { ["message":protected]=> string(21) "Class 'Foo' not found" ["string":"Error":private]=> string(0) "" ["code":protected]=> int(0) ["file":protected]=> string(9) "/in/UYSmq" ["line":protected]=> int(14) ["trace":"Error":private]=> array(0) { } ["previous":"Error":private]=> NULL }

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