3v4l.org

run code in 300+ PHP versions simultaneously
<?php namespace A { function print_r($x) { print 'No print_r for you!'.PHP_EOL; } } namespace A { $x = []; print_r($x); } // It looks like it, but // A\B is not a child of A!! namespace A\B { // Just print_r for you, with fallback print_r($x); } ?>
Output for 8.1.32, 8.2.0 - 8.2.29, 8.3.0 - 8.3.28, 8.4.1 - 8.4.14, 8.5.0 - 8.5.1
No print_r for you! Array ( )
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.
preferences:
72.05 ms | 407 KiB | 5 Q