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<?php var_dump(preg_replace('/[\\\]+/', '\\', 'Doctrine\DBAL')); var_dump(preg_replace('/[\\\]+/', '\\', 'Doctrine\\DBAL')); var_dump(preg_replace('/[\\\]+/', '\\', 'Doctrine\\\DBAL')); var_dump(preg_replace('/[\\\]+/', '\\', 'Doctrine\\\\DBAL')); var_dump(preg_replace('/[\\\]+/', '\\', 'Doctrine\\\\\DBAL')); var_dump(preg_replace('/[\\\]+/', '\\', 'Doctrine\\\\\\DBAL')); var_dump(preg_replace('/[\\\]+/', '\\', 'Doctrine\\\\\\\DBAL')); var_dump(preg_replace('/[\\\]+/', '\\', 'Doctrine\\\\\\\\DBAL')); var_dump(preg_replace('/[\\\]+/', '\\', 'Doctrine\\\\\\\\\DBAL'));
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
string(13) "Doctrine\DBAL" string(13) "Doctrine\DBAL" string(13) "Doctrine\DBAL" string(13) "Doctrine\DBAL" string(13) "Doctrine\DBAL" string(13) "Doctrine\DBAL" string(13) "Doctrine\DBAL" string(13) "Doctrine\DBAL" string(13) "Doctrine\DBAL"