WhatisPHP?PHPisarecursiveacronymforHypertextPreprocessor.Itisaserver-sidescriptinglanguagewhosemainpurposeistogeneratetheHTMLcode,whichcanbeviewedbytheclient.Assuch,thePHPcodeitselfisnotvisibletotheclients(i.e.,ifyoudoa"viewsource"inyourwebbrowser,youcannotseethePHPcode.YoucanonlyseetheresultingHTMLcode).Thiscontrastswithclient-sidelanguagessuchasJavascript,whichisvisib...