{"id":34424,"date":"2019-11-02T04:36:39","date_gmt":"2019-11-02T11:36:39","guid":{"rendered":"https:\/\/staging.kinsta.site\/?post_type=knowledgebase&#038;p=24276"},"modified":"2022-12-01T11:12:28","modified_gmt":"2022-12-01T10:12:28","slug":"hvad-er-php","status":"publish","type":"knowledgebase","link":"https:\/\/staging.kinsta.site\/dk\/videnbase\/hvad-er-php\/","title":{"rendered":"Hvad er PHP? Hvordan Bruges PHP i WordPress?"},"content":{"rendered":"<p><a href=\"https:\/\/www.php.net\/\">PHP<\/a> er et open-source, script-og <a href=\"https:\/\/staging.kinsta.site\/blog\/scripting-languages\/\">programmeringssprog<\/a> p\u00e5 serversiden, der prim\u00e6rt bruges til webudvikling. St\u00f8rstedelen af \u200b\u200bkernens WordPress-software er skrevet i PHP, hvilket g\u00f8r PHP til et meget vigtigt sprog for WordPress-samfundet. Nogle vil gerne sige, at <a href=\"https:\/\/staging.kinsta.site\/dk\/blog\/er-php-dod\/\">PHP som programmeringssprog er d\u00f8dt<\/a>, men det er ikke sandt.<\/p>\n<p>Der er forskellige <a href=\"https:\/\/staging.kinsta.site\/dk\/videnbase\/opdateres-php-versionen-wordpress\/\">versioner af PHP<\/a>, som du kan <a href=\"https:\/\/staging.kinsta.site\/dk\/blog\/installeres-php\/\">installere p\u00e5 din server<\/a>, hvor den nyere PHP 8.0 og 8.1 <a href=\"https:\/\/staging.kinsta.site\/dk\/blog\/php-benchmarks\/\">tilbyder betydelige ydelsesforbedringer<\/a> over de tidligere versioner. Disse ydelsesforbedringer plus forbedret sikkerhed er grunden til, at Kinsta altid tilbyder <a href=\"https:\/\/staging.kinsta.site\/dk\/blog\/php-8\/\">de nyeste versioner af PHP<\/a>.<\/p>\n<p>I dette indl\u00e6g forklarer vi mere om, hvad &#8220;serversiden&#8221; betyder, og hvordan PHP fungerer. Derefter g\u00e5r vi ind p\u00e5 nogle af de m\u00e5der, som PHP specifikt g\u00e6lder for WordPress- og WordPress-websteder.<\/p>\n<h2>Hvordan Fungerer PHP?<\/h2>\n<p>I den korte definition ovenfor l\u00e6rte du, at <strong>PHP er et sprog p\u00e5 serversiden<\/strong>. Men hvad betyder \u201dserversiden\u201d egentlig? Server-side betyder, at al behandling foreg\u00e5r p\u00e5 din webserver, f\u00f8r noget leveres til din bes\u00f8gendes browser.<\/p>\n<p>Her er et eksempel. Sig, at nogen bes\u00f8ger dit WordPress-sted. Inden du sender nogle filer til den bes\u00f8gende, k\u00f8rer din server f\u00f8rst PHP-koden indeholdt i WordPress-kernen og eventuelle temaer \/ plugins, du har installeret p\u00e5 dit websted.<\/p>\n<p>N\u00e5r din server derefter har behandlet koden, leverer den derefter output fra alt det PHP (som er den HTML-kode, som en bes\u00f8gende browser faktisk modtager).<\/p>\n<p>Slutresultatet er, at i mods\u00e6tning til HTML, bes\u00f8gende p\u00e5 dit websted aldrig vil se den PHP-kode, der driver dit WordPress-sted. De ser bare den allerede behandlede kode, som din server leverer til deres browser.<\/p>\n<h3>PHP 5 vs PHP 7 og PHP 8<\/h3>\n<p>If\u00f8lge W3Techs <a href=\"https:\/\/w3techs.com\/technologies\/details\/pl-php\/all\/all\">bruges PHP af over 78%<\/a> af alle websteder, der bruger et programmeringssprog p\u00e5 serversiden, hvor ASP.NET kommer p\u00e5 andenpladsen med lidt over 10% markedsandel.<\/p>\n<p>Som andre programmeringssprog er der forskellige versioner af PHP, som du kan bruge. PHP 5, 7.0, 7.1, 7.2, 7.3, og 7.4 er \u00e6ldre versioner af PHP, der har <a href=\"https:\/\/staging.kinsta.site\/dk\/blog\/php-versioner\/\">n\u00e5et deres slutning af livet<\/a>. Det betyder, at de ikke l\u00e6ngere vil modtage aktiv support og er oph\u00f8rt med (eller snart vil oph\u00f8re) med at modtage sikkerhedssupport.<\/p>\n<p>PHP 8.0 og 8.1 tilbyder betydelige ydelses- og sikkerhedsforbedringer. Hos Kinsta underst\u00f8tter vi f\u00f8lgende PHP-versioner med vores <a href=\"https:\/\/staging.kinsta.site\/dk\/changelog\/auto-db-optimeringer-v2\/#selfhealing-php\">brugerdefinerede selvhelbredende konfiguration<\/a>:<\/p>\n<ul>\n<li><a href=\"https:\/\/staging.kinsta.site\/dk\/blog\/php-8\/\">PHP 8.0<\/a><\/li>\n<li><a href=\"https:\/\/staging.kinsta.site\/blog\/php-8-1\/\">PHP 8.1<\/a><\/li>\n<\/ul>\n<p>Du kan endda \u00e6ndre PHP-versioner med et enkelt klik.<\/p>\n<figure id=\"attachment_140372\" aria-describedby=\"caption-attachment-140372\" style=\"width: 1200px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-140372 size-full\" src=\"https:\/\/staging.kinsta.site\/wp-content\/uploads\/2018\/05\/modify-php-engine.png\" alt=\"Opdater dit websteds PHP-version i MyKinsta.\" width=\"1200\" height=\"459\"><figcaption id=\"caption-attachment-140372\" class=\"wp-caption-text\">Opdater dit websteds PHP-version i MyKinsta.<\/figcaption><\/figure>\n<h2>Hvordan Bruges PHP i WordPress?<\/h2>\n<p>Hvis du g\u00e5r og henter den seneste kopi af WordPress <a href=\"https:\/\/wordpress.org\/\">fra WordPress.org<\/a>, kan du \u00e5bne ZIP-filen for at se, at de fleste af de inkluderede kerne WordPress-filer er PHP:<\/p>\n<figure id=\"attachment_24278\" aria-describedby=\"caption-attachment-24278\" style=\"width: 970px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-24278 size-full\" title=\"Viewing core WordPress PHP files.\" src=\"https:\/\/staging.kinsta.site\/wp-content\/uploads\/2018\/05\/what-is-php.png\" alt=\"Visning af kerne WordPress PHP-filer\" width=\"970\" height=\"406\"><figcaption id=\"caption-attachment-24278\" class=\"wp-caption-text\">Visning af kerne WordPress PHP-filer.<\/figcaption><\/figure>\n<p>Tilsvarende vil <a href=\"https:\/\/staging.kinsta.site\/blog\/wordpress-free-vs-paid-themes\/\">ethvert tema<\/a>, du installerer, indeholde en masse PHP-filer (sk\u00e6rmbilledet nedenfor er <a href=\"https:\/\/staging.kinsta.site\/blog\/twenty-seventeen-theme\/\">standard Twenty Seventeen-temaet<\/a>):<\/p>\n<figure id=\"attachment_24279\" aria-describedby=\"caption-attachment-24279\" style=\"width: 971px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-24279 size-full\" title=\"Eksempel p\u00e5 PHP-filer i et WordPress tema.\" src=\"https:\/\/staging.kinsta.site\/wp-content\/uploads\/2018\/05\/what-is-php-2.png\" alt=\"Eksempel p\u00e5 PHP-filer i et WordPress tema\" width=\"971\" height=\"441\"><figcaption id=\"caption-attachment-24279\" class=\"wp-caption-text\">Eksempel p\u00e5 PHP-filer i et WordPress tema.<\/figcaption><\/figure>\n<p>Og alle <a href=\"https:\/\/staging.kinsta.site\/knowledgebase\/how-to-install-wordpress-plugins\/\">plugins, du installerer<\/a>, &#8211; du g\u00e6ttede det &#8211; vil ogs\u00e5 prim\u00e6rt v\u00e6re PHP:<\/p>\n<figure id=\"attachment_24280\" aria-describedby=\"caption-attachment-24280\" style=\"width: 973px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-24280 size-full\" title=\"Eksempel p\u00e5 PHP-filer i et WordPress-plugin.\" src=\"https:\/\/staging.kinsta.site\/wp-content\/uploads\/2018\/05\/what-is-php-3.png\" alt=\"Eksempel p\u00e5 PHP-filer i et WordPress-plugin\" width=\"973\" height=\"277\"><figcaption id=\"caption-attachment-24280\" class=\"wp-caption-text\">Eksempel p\u00e5 PHP-filer i et WordPress-plugin.<\/figcaption><\/figure>\n<p>Ud over at bruge PHP til sine kernefiler inkluderer WordPress ogs\u00e5 et <a href=\"https:\/\/staging.kinsta.site\/blog\/wordpress-hooks\/\">stort antal funktioner, hooks, klasser og metoder<\/a>, som du eller udviklere kan bruge til at udvide WordPress &#8216;funktionalitet p\u00e5 mange nyttige m\u00e5der.<\/p>\n<p>For eksempel er en af de mest kendte funktioner er <code>the_content();<\/code>. Selvom dette lille uddrag ser uskyldigt nok ud, er det faktisk det, dit tema bruger til at vise hele indholdet af hvert enkelt af dine blogindl\u00e6g.<\/p>\n<p>Ja &#8211; det ene lille uddrag kan blive til et 10.000-ords blogindl\u00e6g, efter at din webserver er f\u00e6rdig med at behandle PHP-koden. Disse funktioner, hooks, klasser og metoder er en stor del af, hvad der g\u00f8r WordPress fleksibel.<\/p>\n<h3>Et eksempel p\u00e5, Hvordan PHP Fungerer i et WordPress-tema<\/h3>\n<p>Lad os tage tingene lidt videre med et hurtigt eksempel, der forbinder PHP-serversiden til dit WordPress-sted.<\/p>\n<p>Hvis du g\u00e5r tilbage til det billede af Twenty Seventeen-temaet:<\/p>\n<figure id=\"attachment_24279\" aria-describedby=\"caption-attachment-24279\" style=\"width: 971px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-24279 size-full\" title=\"PHP-filer i et WordPress Twenty Seventeen-tema.\" src=\"https:\/\/staging.kinsta.site\/wp-content\/uploads\/2018\/05\/what-is-php-2.png\" alt=\"PHP-filer i et WordPress Twenty Seventeen-tema\" width=\"971\" height=\"441\"><figcaption id=\"caption-attachment-24279\" class=\"wp-caption-text\">PHP-filer i et WordPress Twenty Seventeen-tema.<\/figcaption><\/figure>\n<p>Du kan se, at der er separate PHP-filer til ting som &#8220;sidebar.php&#8221;, &#8220;header.php&#8221;, &#8220;comments.php&#8221; osv.<\/p>\n<p>Hvis du allerede bruger WordPress, skal disse udtryk lyde temmelig velkendt. Og ja, det er virkelig s\u00e5 enkelt &#8211; hver af disse filer opretter forbindelse til det lignende navngivne omr\u00e5de p\u00e5 fronten af \u200b\u200bdit websted.<\/p>\n<p>For eksempel:<\/p>\n<ul>\n<li><strong>sidebar.php<\/strong> dikterer, hvordan dit sidebar-omr\u00e5de ser ud og fungerer<\/li>\n<li><strong>header.php<\/strong> dikterer, hvordan dit header ser ud og fungerer<\/li>\n<li><strong>comments.php<\/strong> dikterer, hvordan dit kommentarsektion ser ud og fungerer<\/li>\n<li>osv.<\/li>\n<\/ul>\n<p>Hver gang nogen bes\u00f8ger dit websted, tager din webserver alle disse separate PHP-filer til forskellige omr\u00e5der i dit tema, s\u00e6tter dem sammen som specificeret af dit tema og leverer den afsluttede HTML-output til din bes\u00f8gende browser.<\/p>\n<h2>Beh\u00f8ver Regelm\u00e6ssige Brugere at Kende PHP for at Bruge WordPress?<\/h2>\n<p><strong>Ingen!<\/strong> Ikke engang t\u00e6t p\u00e5. Den smukke ting ved WordPress er, at alt PHP allerede er skrevet til dig i form af den centrale WordPress-software, <a href=\"https:\/\/staging.kinsta.site\/dk\/bedste-wordpress-temaer\/\">WordPress-temaer<\/a> og WordPress-plugins.<\/p>\n<p>Mens avancerede WordPress-brugere kan bruge PHP til at foretage mere komplicerede tilpasninger, beh\u00f8ver afslappede WordPress-brugere aldrig at bekymre sig om PHP, hvis de ikke \u00f8nsker det.<\/p>\n<p>Hvad der bliver sagt, er der bestemt fordele ved at <a href=\"https:\/\/staging.kinsta.site\/blog\/best-programming-language-to-learn\/#php\">l\u00e6re det grundl\u00e6ggende i PHP<\/a>. Selv bare at l\u00e6re de <a href=\"https:\/\/www.theedesign.com\/blog\/2012\/short-code-guide-for-wordpress\">mest popul\u00e6re WordPress PHP-funktioner<\/a> hj\u00e6lper dig med hurtigt at lave nogle lette, men betydningsfulde, finjusteringer til dit WordPress-sted. Husk at tjekke vores vejledning om, <a href=\"https:\/\/staging.kinsta.site\/dk\/videnbase\/phpinfo\/\">hvordan du bruger phpinfo() funktionen<\/a>.<\/p>\n<p>Og hvis du vil udvikle dine egne WordPress-temaer og plugins, er det vigtigt at l\u00e6re PHP.<\/p>\n","protected":false},"author":38,"featured_media":34431,"parent":0,"menu_order":0,"template":"","tags":[39,38],"knowledge_categories":[27],"topic":[],"class_list":["post-34424","knowledgebase","type-knowledgebase","status-publish","has-post-thumbnail","hentry","tag-php","tag-webdev","knowledge_categories-ordliste"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v17.1.2 (Yoast SEO v25.8) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Hvad er PHP? Hvordan Bruges PHP i WordPress? - Kinsta<\/title>\n<meta name=\"description\" content=\"PHP er et open source, script-og programmeringssprog p\u00e5 serversiden, der prim\u00e6rt bruges til webudvikling. St\u00f8rstedelen af kernens WordPress-software er skrevet i PHP, hvilket g\u00f8r PHP til et meget vigtigt sprog for WordPress-samfundet. Klik her for at l\u00e6re mere om PHP.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/staging.kinsta.site\/dk\/videnbase\/hvad-er-php\/\" \/>\n<meta property=\"og:locale\" content=\"da_DK\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Hvad er PHP? Hvordan Bruges PHP i WordPress?\" \/>\n<meta property=\"og:description\" content=\"PHP er et open source, script-og programmeringssprog p\u00e5 serversiden, der prim\u00e6rt bruges til webudvikling. St\u00f8rstedelen af kernens WordPress-software er skrevet i PHP, hvilket g\u00f8r PHP til et meget vigtigt sprog for WordPress-samfundet. 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