{"id":483,"date":"2026-02-09T13:48:58","date_gmt":"2026-02-09T08:18:58","guid":{"rendered":"https:\/\/tutorialsmines.com\/blog\/?p=483"},"modified":"2026-02-09T13:48:59","modified_gmt":"2026-02-09T08:18:59","slug":"how-to-install-and-enable-gmp-extension-in-xampp-php-on-linux-step-by-step-guide","status":"publish","type":"post","link":"https:\/\/tutorialsmines.com\/blog\/how-to-install-and-enable-gmp-extension-in-xampp-php-on-linux-step-by-step-guide\/","title":{"rendered":"How to Install and Enable GMP Extension in XAMPP PHP on Linux (Step-by-Step Guide)"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\">Introduction<\/h2>\n\n\n\n<p>If you are using <strong>XAMPP PHP on a Linux server<\/strong> and encounter errors like:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>GMP NOT OK<\/code><\/li>\n\n\n\n<li><code>Unable to load dynamic library 'gmp'<\/code><\/li>\n\n\n\n<li><code>Call to undefined function gmp_init()<\/code><\/li>\n<\/ul>\n\n\n\n<p>then this usually means the <strong>GMP extension is not installed<\/strong>, not just disabled.<\/p>\n\n\n\n<p>Many developers assume that uncommenting a line in <code>php.ini<\/code> is enough\u2014but in <strong>XAMPP<\/strong>, that is often not true.<\/p>\n\n\n\n<p>This guide explains <strong>why GMP is missing<\/strong>, and shows the <strong>correct, production-safe way<\/strong> to compile, install, and enable the GMP extension for <strong>XAMPP PHP<\/strong>.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">What Is the GMP Extension in PHP?<\/h2>\n\n\n\n<p><strong>GMP (GNU Multiple Precision)<\/strong> is a PHP extension used for handling very large integers and high-precision arithmetic.<\/p>\n\n\n\n<p>Common use cases include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Cryptography and security libraries<\/li>\n\n\n\n<li>JWT \/ OAuth \/ authentication systems<\/li>\n\n\n\n<li>Blockchain and hashing operations<\/li>\n\n\n\n<li>Keycloak integrations<\/li>\n\n\n\n<li>Large integer calculations<\/li>\n<\/ul>\n\n\n\n<p>Example:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>gmp_init(\"12345678901234567890\");<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">The Real Problem (Why GMP Doesn\u2019t Work in XAMPP)<\/h2>\n\n\n\n<p>When you run:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>php -m | grep gmp<\/code><\/pre>\n\n\n\n<p>and get <strong>no output<\/strong>, or:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>GMP NOT OK<\/code><\/pre>\n\n\n\n<p>Even after adding this to <code>php.ini<\/code>:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>extension=gmp<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">\u274c Why this happens<\/h3>\n\n\n\n<p>XAMPP PHP is a <strong>precompiled binary<\/strong> and often <strong>does not include <code>gmp.so<\/code> at all<\/strong>.<\/p>\n\n\n\n<p>So:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>php.ini<\/code> only <em>loads<\/em> extensions<\/li>\n\n\n\n<li>It does <strong>not create them<\/strong><\/li>\n\n\n\n<li>If <code>gmp.so<\/code> does not exist, PHP cannot load it<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Environment Used in This Guide<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>OS: Linux (Ubuntu based)<\/li>\n\n\n\n<li>PHP: <strong>XAMPP PHP 8.2.12<\/strong><\/li>\n\n\n\n<li>PHP binary:<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>\/opt\/lampp\/bin\/php<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li>php.ini location:<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>\/opt\/lampp\/etc\/php.ini<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Step 1: Confirm You Are Using XAMPP PHP<\/h2>\n\n\n\n<pre class=\"wp-block-code\"><code>which php\nphp -v<\/code><\/pre>\n\n\n\n<p>Expected output:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/opt\/lampp\/bin\/php\nPHP 8.2.12<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Step 2: Check Whether GMP Is Loaded<\/h2>\n\n\n\n<pre class=\"wp-block-code\"><code>\/opt\/lampp\/bin\/php -m | grep -i gmp<\/code><\/pre>\n\n\n\n<p>If nothing appears, GMP is not installed.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Step 3: Check the PHP Extension Directory<\/h2>\n\n\n\n<pre class=\"wp-block-code\"><code>\/opt\/lampp\/bin\/php -i | grep extension_dir<\/code><\/pre>\n\n\n\n<p>Example output:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/opt\/lampp\/lib\/php\/extensions\/no-debug-non-zts-20220829<\/code><\/pre>\n\n\n\n<p>Check if <code>gmp.so<\/code> exists:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>ls -l \/opt\/lampp\/lib\/php\/extensions\/no-debug-non-zts-20220829 | grep gmp<\/code><\/pre>\n\n\n\n<p>If nothing is returned, GMP is missing.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Step 4: Install Required Build Dependencies<\/h2>\n\n\n\n<pre class=\"wp-block-code\"><code>sudo apt update\nsudo apt install -y build-essential autoconf automake libtool \\\npkg-config libgmp-dev re2c bison wget<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Step 5: Download PHP Source (Same Version as XAMPP)<\/h2>\n\n\n\n<p>\u26a0\ufe0f <strong>The PHP source version must exactly match your XAMPP PHP version<\/strong>.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>cd \/tmp\nwget https:\/\/www.php.net\/distributions\/php-8.2.12.tar.gz\ntar -xzf php-8.2.12.tar.gz<\/code><\/pre>\n\n\n\n<p>Verify GMP source exists:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>ls \/tmp\/php-8.2.12\/ext\/gmp<\/code><\/pre>\n\n\n\n<p>You should see files like <code>gmp.c<\/code>, <code>config.m4<\/code>, etc.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Step 6: Compile GMP Extension for XAMPP PHP<\/h2>\n\n\n\n<pre class=\"wp-block-code\"><code>cd \/tmp\/php-8.2.12\/ext\/gmp\n\n\/opt\/lampp\/bin\/phpize\n.\/configure --with-php-config=\/opt\/lampp\/bin\/php-config\nmake -j$(nproc)\nsudo make install<\/code><\/pre>\n\n\n\n<p>This step <strong>creates the <code>gmp.so<\/code> file<\/strong>.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Step 7: Verify <code>gmp.so<\/code> Was Installed<\/h2>\n\n\n\n<pre class=\"wp-block-code\"><code>EXT_DIR=$(\/opt\/lampp\/bin\/php -r 'echo ini_get(\"extension_dir\");')\nls -l \"$EXT_DIR\" | grep gmp<\/code><\/pre>\n\n\n\n<p>Expected output:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>gmp.so<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Step 8: Enable GMP in php.ini (Linux)<\/h2>\n\n\n\n<p>Open the file:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>sudo vi \/opt\/lampp\/etc\/php.ini<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">Important Notes<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Ignore lines like:<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>;extension=php_gmp.dll<\/code><\/pre>\n\n\n\n<p>These are <strong>Windows-only<\/strong>.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Do <strong>not<\/strong> uncomment <code>.dll<\/code> lines on Linux.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Add this line:<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>extension=gmp.so<\/code><\/pre>\n\n\n\n<p>Save and exit:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>Esc\n:wq<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Step 9: Restart XAMPP<\/h2>\n\n\n\n<pre class=\"wp-block-code\"><code>sudo \/opt\/lampp\/lampp restart<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Step 10: Final Verification<\/h2>\n\n\n\n<pre class=\"wp-block-code\"><code>\/opt\/lampp\/bin\/php -m | grep -i gmp<\/code><\/pre>\n\n\n\n<p>Expected output:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>gmp<\/code><\/pre>\n\n\n\n<p>Final confirmation:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/opt\/lampp\/bin\/php -r 'echo function_exists(\"gmp_init\") ? \"GMP OK\\n\" : \"GMP NOT OK\\n\";'<\/code><\/pre>\n\n\n\n<p>Expected:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>GMP OK<\/code><\/pre>\n\n\n\n<p>\ud83c\udf89 <strong>GMP is now fully installed and enabled in XAMPP PHP<\/strong><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Common Mistakes to Avoid<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Only uncommenting <code>extension=gmp<\/code><\/li>\n\n\n\n<li>Using <code>.dll<\/code> extensions on Linux<\/li>\n\n\n\n<li>Installing <code>php-gmp<\/code> via <code>apt<\/code> for XAMPP<\/li>\n\n\n\n<li>PHP version mismatch during compilation<\/li>\n\n\n\n<li>Forgetting to restart XAMPP<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Conclusion<\/h2>\n\n\n\n<p>Enabling GMP in <strong>XAMPP PHP on Linux<\/strong> requires more than editing <code>php.ini<\/code>.<br>When the extension is missing, <strong>compiling it for your exact PHP version is the correct and safe solution<\/strong>.<\/p>\n\n\n\n<p>This method:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Does <strong>not<\/strong> reinstall PHP<\/li>\n\n\n\n<li>Does <strong>not<\/strong> reinstall XAMPP<\/li>\n\n\n\n<li>Works reliably in production environments<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>Introduction If you are using XAMPP PHP on a Linux server and encounter errors like: then this usually means the GMP extension is not installed,<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[430,676],"tags":[684,677,685,680,678,681,683,686,679,682],"class_list":["post-483","post","type-post","status-publish","format-standard","hentry","category-laravel","category-xampp","tag-compile-gmp-php","tag-enable-gmp-in-xampp","tag-gmp-php-linux","tag-gmp_init-not-found","tag-install-gmp-extension-php","tag-php-gmp-extension-missing","tag-php-gmp-so-install","tag-php-xampp-linux-gmp","tag-xampp-php-8-gmp","tag-xampp-php-gmp-install"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>How to 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