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<?php spl_autoload_register(function($class) { var_dump('autoload '.$class); }); function test() { $m = new class_one(); } class class_one extends class_two { function __construct() { var_dump('I am '.__CLASS__); } } test();
Output for 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
string(18) "autoload class_two" Fatal error: Uncaught Error: Class "class_two" not found in /in/Ei3Ek:11 Stack trace: #0 {main} thrown in /in/Ei3Ek on line 11
Process exited with code 255.
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.
Output for 7.3.0 - 7.3.33, 7.4.0 - 7.4.33
string(18) "autoload class_two" Fatal error: Uncaught Error: Class 'class_two' not found in /in/Ei3Ek:11 Stack trace: #0 {main} thrown in /in/Ei3Ek on line 11
Process exited with code 255.
Output for 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33
string(18) "autoload class_two" Fatal error: Class 'class_two' not found in /in/Ei3Ek on line 11
Process exited with code 255.

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