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<?php var_dump(unserialize('a:1:{s:11:"attachments";a:1:{i:0;s:34:"/p_attach/3147891/oufhkjur-2350.pd";}}'));
based on WM2DG
Output for 4.3.0 - 7.1.0
array(1) { ["attachments"]=> array(1) { [0]=> string(34) "/p_attach/3147891/oufhkjur-2350.pd" } }