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';
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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.