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<?php $filenameOld = 'PX20170713_103320_2651093_00001'; var_dump(implode(array_slice(explode('_', rtrim(basename($filenameOld), ".xml" )), 0, 2)));
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
string(16) "PX20170713103320"

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