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<?php use PDO; var_dump(new PDO('mysql:dbname=testdb;host=127.0.0.1'));
based on fmDhu
Output for 7.0.0 - 7.1.7, 7.2.0
Warning: The use statement with non-compound name 'PDO' has no effect in /in/EMmfi on line 2 Fatal error: Uncaught PDOException: could not find driver in /in/EMmfi:4 Stack trace: #0 /in/EMmfi(4): PDO->__construct('mysql:dbname=te...') #1 {main} thrown in /in/EMmfi on line 4
Process exited with code 255.
Output for 7.1.10

Process exited with code 137.
Output for 5.3.0 - 5.6.28
Warning: The use statement with non-compound name 'PDO' has no effect in /in/EMmfi on line 2 Fatal error: Uncaught exception 'PDOException' with message 'could not find driver' in /in/EMmfi:4 Stack trace: #0 /in/EMmfi(4): PDO->__construct('mysql:dbname=te...') #1 {main} thrown in /in/EMmfi on line 4
Process exited with code 255.
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.2.17
Parse error: syntax error, unexpected T_STRING, expecting T_CONSTANT_ENCAPSED_STRING or '(' in /in/EMmfi on line 2
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1, 5.0.0 - 5.0.5
Parse error: parse error, unexpected T_STRING, expecting T_CONSTANT_ENCAPSED_STRING or '(' in /in/EMmfi on line 2
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `T_CONSTANT_ENCAPSED_STRING' or `'('' in /in/EMmfi on line 2
Process exited with code 255.