Sorting Arrays. PHP has several functions that deal with sorting arrays, and this document exists to help sort it all out. The main differences are: Some sort based on the array keys, whereas others by the values: $array['key'] = 'value';
Can I install Roof-TopÂ® EPDM membrane directly over an existing roof? You can install Roof-TopÂ® EPDM membrane over an existing roof only if a new layer of 5/8â plywood, 5/8â OSB board, or polyisocyanurate board with a fiberglass backing is used as a barrier to protect the EPDM.
New types of flat roofing material are being used that offer more in the way of protection. Firestoneâs EPDM (Ethylene Propylene Diene Monomer) is a synthetic rubber membrane that is supplied literally in one piece, cut specifically for your flat roof.