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<?php $lol1 = 'var_dump'; $lol2 = 'sprintf'; $lol3 = 'floatval'; $lol4 = 'print'; print('type: ' . gettype($lol1) . "\n"); $lol1('PHP: Madness var_dump'); print('type: ' . gettype($lol2) . "\n"); $lol1($lol2('PHP: Madness sprintf')); print('type: ' . gettype($lol3) . "\n"); $lol1($lol3('PHP: Madness floatval')); # But to keep PHP consistent print does not work. print('type: ' . gettype($lol4) . "\n"); print('This works.'); $lol4('PHP: Madness print');
Output for 7.1.0 - 7.1.33, 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 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.28, 8.4.1 - 8.4.14, 8.5.0 - 8.5.1
type: string string(21) "PHP: Madness var_dump" type: string string(20) "PHP: Madness sprintf" type: string float(0) type: string This works. Fatal error: Uncaught Error: Call to undefined function print() in /in/FRPIp:22 Stack trace: #0 {main} thrown in /in/FRPIp on line 22
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 5.6.38
type: string string(21) "PHP: Madness var_dump" type: string string(20) "PHP: Madness sprintf" type: string float(0) type: string This works. Fatal error: Call to undefined function print() in /in/FRPIp on line 22
Process exited with code 255.

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