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<?php $filenameNew = 'PX20170713_103320_2651093_00001'; $filenameOld = '5956e5781e4f1-20170630_233347_5712837_00001'; var_dump(implode(array_slice(explode('_', rtrim(basename($filenameOld), ".xml" )), 0, 2)));

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