{"id":66742,"date":"2025-11-19T11:00:54","date_gmt":"2025-11-19T11:00:54","guid":{"rendered":"https:\/\/morningtrain.dk\/what-is-php\/"},"modified":"2026-04-17T12:57:14","modified_gmt":"2026-04-17T12:57:14","slug":"what-is-php","status":"publish","type":"post","link":"https:\/\/morningtrain.dk\/en\/what-is-php\/","title":{"rendered":"What is PHP?"},"content":{"rendered":"\n<section class=\"wp-block-mt-blog-post-cover mt-blog-post-cover\"><div class=\"mt-blog-post-cover__inner page-container\"><div class=\"mt-blog-post-cover__text-container\"><p class=\"mt-blog-post-cover__tagline tagline\">Digitalisering<\/p><p class=\"mt-blog-post-cover__date\">19. november 2025<\/p><h1 class=\"mt-blog-post-cover__title\">What is PHP?<\/h1><\/div><div class=\"wp-block-post-excerpt\"><p class=\"wp-block-post-excerpt__excerpt\">PHP is a programming language used to build the backend of dynamic websites, webshops, and custom web applications. In other words, it is the \u201cengine\u201d on the server that brings together data, logic, and content and sends a finished page to your browser, allowing users to take actions in real time. <\/p><\/div>\n\n<figure class=\"wp-block-post-featured-image\"><img decoding=\"async\" width=\"1248\" height=\"720\" src=\"https:\/\/morningtrain.dk\/wp-content\/uploads\/2026\/03\/Hvad-er-PHP_.png\" class=\"attachment-post-thumbnail size-post-thumbnail wp-post-image\" alt=\"\" style=\"object-fit:cover;\" srcset=\"https:\/\/morningtrain.dk\/wp-content\/uploads\/2026\/03\/Hvad-er-PHP_.png 1248w, https:\/\/morningtrain.dk\/wp-content\/uploads\/2026\/03\/Hvad-er-PHP_-300x173.png 300w, https:\/\/morningtrain.dk\/wp-content\/uploads\/2026\/03\/Hvad-er-PHP_-1024x591.png 1024w, https:\/\/morningtrain.dk\/wp-content\/uploads\/2026\/03\/Hvad-er-PHP_-768x443.png 768w, https:\/\/morningtrain.dk\/wp-content\/uploads\/2026\/03\/Hvad-er-PHP_-600x346.png 600w\" sizes=\"(max-width: 1248px) 100vw, 1248px\" \/><\/figure><\/div><\/section>\n<section\n    class=\"mt-blog-post-content mt-blog-post-content--has-table-of-contents mtSpacing-top-none mtSpacing-bottom-medium\"\n>\n    <div class=\"mt-blog-post-content__inner page-container\">\n        <div class=\"mt-blog-post-content__table-of-contents\">\n                                                <p class=\"mt-blog-post-content__table-of-contents-title\">\n                        Indhold\n                    <\/p>\n                                                    <a\n                        href=\"#kort\"\n                        class=\"mt-blog-post-content__table-of-contents-item\"\n                    >\n                        PHP kort fortalt\n                    <\/a>\n                                    <a\n                        href=\"#hvad\"\n                        class=\"mt-blog-post-content__table-of-contents-item\"\n                    >\n                        Hvad bruges det til?\n                    <\/a>\n                                    <a\n                        href=\"#alle\"\n                        class=\"mt-blog-post-content__table-of-contents-item\"\n                    >\n                        Hvem kan bruge det?\n                    <\/a>\n                                    <a\n                        href=\"#fordelene\"\n                        class=\"mt-blog-post-content__table-of-contents-item\"\n                    >\n                        Fordele\n                    <\/a>\n                                    <a\n                        href=\"#ulemperne\"\n                        class=\"mt-blog-post-content__table-of-contents-item\"\n                    >\n                        Ulemper\n                    <\/a>\n                                  <\/div>\n        <div class=\"mt-blog-post-content__items\">\n                            \n\n<p class=\"wp-block-paragraph\">PHP is an abbreviation for &#8220;<strong>H<\/strong>ypertext <strong>P<\/strong>re<strong>p<\/strong>rocessor&#8221;, and yes, it really should be called HPP, but they chose to swap some letters around because it sounded cooler.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">PHP is a server-side (<a href=\"https:\/\/morningtrain.dk\/en\/backend-vs-frontend\/\">backend<\/a>) language used to code dynamic web pages and applications. Server-side means that the code runs on the server before the page reaches the user. <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The language is around 30 years old and is now one of the most widely used programming languages on the internet. Rough estimates suggest that around 90% of all websites rely on PHP in one way or another, and it is often mentioned alongside, for example, C#.  <\/p>\n\n\n\n<div class=\"wp-block-mt-blog-post-text-box mt-blog-post-text-box\"><div class=\"mt-blog-post-text-box__inner page-container\"><div class=\"mt-blog-post-text-box__box\">\n<h3 class=\"wp-block-heading\" id=\"kort\">PHP in brief<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">PHP is a programming language that runs on the server and determines what is displayed on your website. It is used to program the logic behind websites, webshops, and other solutions where the content changes based on the user. <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">In other words, PHP determines what content each user sees and which features are available.<\/p>\n<\/div><\/div><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">As the name &#8220;Hypertext preprocessor&#8221; indicates, PHP is designed to work closely with <a href=\"https:\/\/morningtrain.dk\/en\/the-marketing-dictionary\/#html\">HTML<\/a> (hypertext is what we typically know as HTML pages). PHP code runs on the server, generates or adapts the HTML, and can also be embedded directly in the HTML code. <\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"hvad\">What is PHP used for?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">With PHP, you can perform a wide range of tasks on the web, such as:<\/p>\n\n\n\n<div class=\"wp-block-mt-accordion mt-accordion mtSpacing-top- mtSpacing-bottom-\"><div class=\"mt-accordion__inner\">\n<div class=\"wp-block-mt-accordion-item mt-accordion-item\"><div class=\"mt-accordion-item__title-wrapper\"><h3 class=\"mt-accordion-item__title\">Process forms<\/h3><\/div><div class=\"mt-accordion-item__content-wrapper\" style=\"display:none\"><div class=\"mt-accordion-item__content\">\n<ul class=\"wp-block-list\">\n<li>Contact forms and booking requests (e.g., saving the enquiry and sending a confirmation email).<\/li>\n\n\n\n<li>Login\/registration forms for customer portals.<\/li>\n\n\n\n<li>Data validation (checking whether fields are filled in correctly, preventing spam, etc.).<\/li>\n<\/ul>\n<\/div><\/div><\/div>\n\n\n\n<div class=\"wp-block-mt-accordion-item mt-accordion-item\"><div class=\"mt-accordion-item__title-wrapper\"><h3 class=\"mt-accordion-item__title\">Process files<\/h3><\/div><div class=\"mt-accordion-item__content-wrapper\" style=\"display:none\"><div class=\"mt-accordion-item__content\">\n<ul class=\"wp-block-list\">\n<li>Uploading images and documents (profile pictures, product images, contracts).<\/li>\n\n\n\n<li>Automatic compression or resizing of images for the web.<\/li>\n\n\n\n<li>Generating PDFs (e.g., quotes, invoices, order confirmations).<\/li>\n<\/ul>\n<\/div><\/div><\/div>\n\n\n\n<div class=\"wp-block-mt-accordion-item mt-accordion-item\"><div class=\"mt-accordion-item__title-wrapper\"><h3 class=\"mt-accordion-item__title\">Create databases<\/h3><\/div><div class=\"mt-accordion-item__content-wrapper\" style=\"display:none\"><div class=\"mt-accordion-item__content\">\n<ul class=\"wp-block-list\">\n<li>Creating, reading, updating, and deleting data in databases (customer data, order data, product catalogues).<\/li>\n\n\n\n<li>Building dashboards and reports based on data.<\/li>\n<\/ul>\n<\/div><\/div><\/div>\n\n\n\n<div class=\"wp-block-mt-accordion-item mt-accordion-item\"><div class=\"mt-accordion-item__title-wrapper\"><h3 class=\"mt-accordion-item__title\">Dynamic adjustments on a website based on the user\u2019s interaction<\/h3><\/div><div class=\"mt-accordion-item__content-wrapper\" style=\"display:none\"><div class=\"mt-accordion-item__content\">\n<ul class=\"wp-block-list\">\n<li>Showing different prices, products, or content depending on whether the user is logged in, customer type, or language.<\/li>\n\n\n\n<li>Remembering previous actions (recently viewed products, favourites lists, saved searches).<\/li>\n<\/ul>\n<\/div><\/div><\/div>\n<\/div><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">And much more&#8230;<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/morningtrain.dk\/en\/?p=66742\">PHP<\/a> is compatible with all major operating systems (OS): Windows, macOS, and Linux.<\/p>\n\n\n\n<div class=\"wp-block-mt-blog-post-text-box mt-blog-post-text-box\"><div class=\"mt-blog-post-text-box__inner page-container\"><div class=\"mt-blog-post-text-box__box\">\n<p class=\"wp-block-paragraph\"><strong>PHP is an obvious choice for general web development<\/strong>, i.e., building websites, blogs, webshops, platforms, and other web applications.<\/p>\n<\/div><\/div><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">PHP can also be used to build <a href=\"https:\/\/morningtrain.dk\/en\/what-is-a-cms-and-what-should-you-be-aware-of\/\">CMS<\/a> solutions such as <a href=\"https:\/\/morningtrain.dk\/en\/wordpress-agency\/\">WordPress<\/a>, <a href=\"https:\/\/morningtrain.dk\/en\/drupal-7-end-of-life-what-does-it-mean-for-you-your-options-and-alternatives\/\">Drupal<\/a>, and Joomla, making it easy to create, change, and manage the content on a website.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">If you need to build complex web applications (<a href=\"https:\/\/morningtrain.dk\/en\/the-marketing-dictionary\/#crm\">CRM systems<\/a>, customer databases, HR solutions, etc.), PHP is also an obvious choice\u2014partly because the language is also well suited for building <a href=\"https:\/\/morningtrain.dk\/en\/what-is-an-api\/\">APIs<\/a> (Application Programming Interfaces), which are the \u201cbridge\u201d between two systems. <\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\">So PHP is not only great for building systems and applications; it is also a strong language for building integrations (the bridge) to other systems.<\/p>\n<\/blockquote>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"alle\">Can anyone use PHP?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Yes, anyone can and may use PHP, as the language is so-called open-source software. This means that the source code is publicly available, and you may use, modify, and distribute the code without restrictions. <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The great freedom in using PHP has created a large developer community around the language, which contributes to its continued development and improvement. This is a clear strength of PHP. <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">PHP has also become an extremely popular and widely used platform for web development, as it can be used without fixed costs and because many free tools are available to help developers learn and use the language.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"fordelene\">PHP has many advantages<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">1 &#8211; Easy to learn and use<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">As mentioned earlier, the language is easy to learn and use, which keeps the barrier to getting started with PHP low. Many support tools and resources are available, as well as a large community around it. <\/p>\n\n\n\n<h3 class=\"wp-block-heading\">2 &#8211; Free to use<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">It almost goes without saying that it is an advantage that PHP is free to use with no restrictions, so you can modify and distribute the code however you like.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">3 &#8211; Many support tools available<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">PHP offers a wide range of libraries and frameworks that can make development processes shorter and more efficient.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This can include tools for data processing, error handling, or security.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">4 &#8211; Easy integration with other technologies<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">PHP is easy to integrate with other web technologies such as <a href=\"https:\/\/morningtrain.dk\/en\/the-marketing-dictionary\/#html\">HTML<\/a>, <a href=\"https:\/\/morningtrain.dk\/en\/the-marketing-dictionary\/#css\">CSS<\/a>, JavaScript, and MySQL, making it possible to develop advanced web applications that work well across browsers and platforms.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">5 &#8211; Scalable codebase<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">PHP can handle everything from small websites to large, advanced applications. PHP makes it easy to adapt and expand web solutions as needed. <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This is due, among other things, to the fact that the language is easy to integrate with other technologies and to the large community that continuously expands and improves what is possible with PHP.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"ulemperne\">What about the disadvantages? They exist too <\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Nothing in life is without drawbacks, and PHP is no exception.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">1 &#8211; Security is not a given<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">PHP has had\/has a poor reputation when it comes to security, and although it has become more secure over the years, you should be aware that PHP is only as secure as you make it.<\/p>\n\n\n\n<div class=\"wp-block-mt-blog-post-text-box mt-blog-post-text-box\"><div class=\"mt-blog-post-text-box__inner page-container\"><div class=\"mt-blog-post-text-box__box\">\n<p class=\"wp-block-paragraph\">Because the language is so widely used, it has become a popular target for hackers and other cybercriminals. Therefore, you must take security seriously and follow best practices when working with PHP. <\/p>\n<\/div><\/div><\/div>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>2 &#8211; Documentation challenges<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Because PHP is so popular and can be used for so many things, it can be difficult to find all the necessary documentation, as the language can do almost anything to a greater or lesser extent. As a result, you may find areas that are not thoroughly documented. <\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>3 &#8211; Too many cooks in the kitchen<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The large community also has the \u201cside benefit\u201d that there are many different approaches and solutions to the same problems. This can make it difficult to find the best tools and solutions for your challenges. <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">In addition, there is not always a clear standard for PHP, so different developers may each have their own approach and logic for solving the same challenges.<\/p>\n\n\n                                            <\/div>\n        <div class=\"mt-blog-post-content__small-related-posts\">\n                                <\/div>\n    <\/div>\n    <\/section>\n\n","protected":false},"excerpt":{"rendered":"<p>PHP is a programming language used to build the backend of dynamic websites, webshops, and custom web applications. In other words, it is the \u201cengine\u201d on the server that brings together data, logic, and content and sends a finished page to your browser, allowing users to take actions in real time. <\/p>\n","protected":false},"author":8,"featured_media":66743,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[285],"tags":[],"class_list":["post-66742","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-digitalization"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.0 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>What is PHP? - Morningtrain<\/title>\n<meta name=\"description\" content=\"In this blog post, you can read about what the programming language PHP is, and what advantages and disadvantages it has.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/morningtrain.dk\/en\/what-is-php\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"What is PHP? 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