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<?php echo "test"; echo file_get_contents('/etc');
Output for 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
test Notice: file_get_contents(): Read of 8600 bytes failed with errno=21 Is a directory in /in/bqvTM on line 5
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28
test Notice: file_get_contents(): Read of 8192 bytes failed with errno=21 Is a directory in /in/bqvTM on line 5
Output for 7.4.0 - 7.4.33
test Notice: file_get_contents(): read of 8192 bytes failed with errno=21 Is a directory in /in/bqvTM on line 5
Output for 5.5.24 - 5.5.32, 5.5.34 - 5.5.35, 5.6.8 - 5.6.17, 5.6.20 - 5.6.28, 7.0.0 - 7.0.3, 7.0.5 - 7.0.20, 7.1.0 - 7.1.10, 7.1.25 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33
test
Output for 7.1.20
test Warning: file_get_contents(): open_basedir restriction in effect. File(/etc) is not within the allowed path(s): (/tmp:/in) in /in/bqvTM on line 5 Warning: file_get_contents(/etc): failed to open stream: Operation not permitted in /in/bqvTM on line 5
Output for 5.5.33, 5.6.18 - 5.6.19, 7.0.4
test Warning: file_get_contents(/etc): failed to open stream: Permission denied in /in/bqvTM on line 5

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