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<?php namespace foo { trait A { function x() { var_dump(self::class); } } class Q { use \foo\A; } class R extends Q {} } namespace { class B { use \foo\A; } class C { use \foo\A; } class D extends C {} function main() { (new B)->x(); (new C)->x(); (new D)->x(); (new Q)->x(); (new R)->x(); } main(); }
Output for 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
string(1) "B" string(1) "C" string(1) "C" Fatal error: Uncaught Error: Class "Q" not found in /in/boZBh:18 Stack trace: #0 /in/boZBh(22): main() #1 {main} thrown in /in/boZBh on line 18
Process exited with code 255.
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 string(1) "B" string(1) "C" string(1) "C" Fatal error: Uncaught Error: Class "Q" not found in /in/boZBh:18 Stack trace: #0 /in/boZBh(22): main() #1 {main} thrown in /in/boZBh on line 18
Process exited with code 255.
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33
string(1) "B" string(1) "C" string(1) "C" Fatal error: Uncaught Error: Class 'Q' not found in /in/boZBh:18 Stack trace: #0 /in/boZBh(22): main() #1 {main} thrown in /in/boZBh on line 18
Process exited with code 255.
Output for 5.5.24 - 5.5.35, 5.6.8 - 5.6.28
string(1) "B" string(1) "C" string(1) "C" Fatal error: Class 'Q' not found in /in/boZBh on line 18
Process exited with code 255.

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