{"id":4314,"date":"2020-10-30T22:35:57","date_gmt":"2020-10-30T21:35:57","guid":{"rendered":"https:\/\/webhosting.de\/?p=4314"},"modified":"2025-02-19T18:34:31","modified_gmt":"2025-02-19T17:34:31","slug":"php","status":"publish","type":"post","link":"https:\/\/webhosting.de\/da\/php\/","title":{"rendered":"PHP"},"content":{"rendered":"

PHP er en forkortelse for et scripting-sprog kaldet Hypertext Preprocessor. Forkortelsen PHP stod l\u00e6nge for Personal Home Page Tool, som det oprindeligt var. Scriptsproget eller programmeringssproget er baseret p\u00e5 Perl- og C-syntaks. Disse programmer er uundv\u00e6rlige til at skabe dynamiske hjemmesider og webapplikationer. Hypertekst-pr\u00e6processoren er frit tilg\u00e6ngelig og distribueres som gratis software under PHP-licensen. PHP er uundv\u00e6rlig p\u00e5 grund af sin omfattende databaseunderst\u00f8ttelse, integrationen af internetprotokoller og tilg\u00e6ngeligheden af mange funktionsbiblioteker. Softwarepakken kan ogs\u00e5 indeholde Squid.<\/p>\n

Hvordan blev det distribueret, og hvordan fungerer PHP?<\/h3>\n

I begyndelsen af 2013 blev PHP brugt p\u00e5 omkring 244 millioner hjemmesider. Softwarepakken kan ogs\u00e5 indeholde Squid. I 2015 blev 82% hjemmesider styret af dette programmeringssprog. Hypertext Preprocessor er det mest udbredte programmeringssprog i verden, fordi det er let at l\u00e6re og ukompliceret. Programmet kan skabe hjemmesider og er ogs\u00e5 ofte allerede installeret af webhosts. Med PHP-systemet kan koderne arbejde p\u00e5 serversiden. Det betyder, at kildekoden ikke kan sendes til en webbrowser. Denne kildekode sendes til en fortolker fra webserveren. Fortolkeren tjekker kildekoden og sender derefter output til browseren. Dette output fra PHP-fortolkeren vises ogs\u00e5 til sidst. Fortolkeren sender et HTML-dokument til browseren, som kan genereres med PHP sammen med andre filer som f.eks. billeder og PDF-filer. Systemet, der afvikler webapplikationer med en PHP-fil, er \"php-indstillinger\"<\/a>der er et presserende behov. Systemet skal v\u00e6re i stand til at h\u00e5ndtere instruktionerne i filen. En gr\u00e6nseflade (f.eks. ISAPI eller CGI) hj\u00e6lper fortolkeren med at udf\u00f8re en serverd\u00e6mon eller andre servertjenester (f.eks. Apache eller IIS). En blanding af operativsystemer som Linux, Windows og macOS, en webserver som Apache og PHP kaldes LAMP for Linux. Til Windows hedder pakken WAMP, og til macOS hedder den MAMP. XAMPP-projektet udvikler pakker, som neutraliserer pakker fra internettet. Disse versioner kan dog kun bruges til testmilj\u00f8er. Hypertext Preprocessor k\u00f8rer faktisk kun i et webservermilj\u00f8, s\u00e5 PHP er ogs\u00e5 underlagt HTTP. Hver PHP-side, der kaldes op, bidrager til belastningen af webserveren. Fortolkeren arbejder ogs\u00e5 med kildekoden. Det \u00f8ger belastningen og reducerer svarhastigheden. Der findes forskellige bytecode-cacher for at forbedre svarhastigheden. Cacherne stilles til r\u00e5dighed for midlertidig lagring af programmet og fremskynder adgangen, n\u00e6ste gang filen kaldes. PHP-programmet kan bruges til at skrive scripts, der er kommandolinjeorienterede. Disse er ogs\u00e5 uafh\u00e6ngige af de interne funktioner. En anden gratis software med PHP-koden har heddet Hip-Hop siden 2010. Det blev udviklet efter flere \u00e5rs forskning af Facebook<\/a> blev udviklet for at lette serverbelastningen p\u00e5 40 procent hos Facebook.<\/p>\n

Sessioner med PHP-programmet<\/h3>\n

Kun almindelige variabler er tilg\u00e6ngelige i en HTTP-anmodning. Og kun gemte filer. I anmodningsomfanget, efter sidekaldet, dvs. i slutningen, er Data<\/a>eller hukommelsen slettes ogs\u00e5. Hvis en bruger sletter en Websted<\/a> Dette involverer ofte flere sidevisninger. S\u00e5kaldte sessionsvariabler (session scope) bruges til at fylde en indk\u00f8bskurv i en onlinebutik. PHP gemmer data p\u00e5 tv\u00e6rs af sessioner, hvilket er en standardkonfiguration (application scope). De gemmes p\u00e5 serveren p\u00e5 andre m\u00e5der, s\u00e5 indholdet af den virtuelle indk\u00f8bskurv ikke g\u00e5r tabt, hver gang der kaldes en ny side.<\/p>","protected":false},"excerpt":{"rendered":"

PHP ist die Abk\u00fcrzung f\u00fcr eine Skriptsprache namens Hypertext Preprocessor. Diese Abk\u00fcrzung PHP stand lange f\u00fcr Personal Home Page Tool, diese ist urspr\u00fcnglich so gewesen. Die Skriptsprache oder auch Programmiersprache ist Syntax angelehnt an Perl und C. Diese Programme sind f\u00fcr die Erstellung von dynamischen Webseiten und Webanwendungen unverzichtbar. Der Hypertext Preprocessor ist hierbei als 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