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Your PHP Installation Appears to Be Missing the MySQL Extension: What It Means and How to Fix It (2026)
TL;DRThe missing the MySQL extension message means PHP cannot find the function mysqli_connect, so WordPress stopped before it touched your database. Check the PHP version and the extension list for the account, choose one MySQL driver set, and reload. Plugins, themes and wp-config.php are not the cause.
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WordPress Mixed Content: Find and Fix Every http:// URL After SSL
TL;DRWordPress mixed content means an HTTPS page is asking for something over http://. In our Chrome 156 test, images, audio and CSS backgrounds were upgraded to HTTPS, while scripts, stylesheets, iframes, fetch calls and srcset images were blocked. WordPress rewrites only your own old home URL, and only after a flagged http-to-https switch, so everything else has to be fixed where it is stored. Read the console, change each URL at its source, purge every cache, then check again in a private window.
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Installation Failed: Destination Folder Already Exists in WordPress: What It Means and How to Fix It
TL;DRWordPress stops with Destination folder already exists when the folder it needs is already on disk and is not empty. An empty folder passes; a single hidden file does not. Read the full path in the message, look inside with hidden files shown, then delete or move the leftover and install again. For a zip of a plugin you already have, Replace current with uploaded clears the old folder first, so back up before you click it.
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Sorry, This File Type Is Not Permitted for Security Reasons: What WordPress Checks and How to Fix It
TL;DRWordPress refuses an upload when the extension is not on its allowed list, when the real content of the file does not match the extension, or when neither check passes and your account lacks the unfiltered upload capability. SVG, JSON and font files fail the first check on a default install. In a WordPress 7.1.4 lab, an administrator was refused all three, a text file renamed to .jpg was refused, and one upload_mimes filter let the first three types through.
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Failed to Open Stream in WordPress: What the Message Is Really Telling You
TL;DRA failed to open stream message in WordPress is PHP reporting that it could not open a file or a web address. The words after the colon name the cause: no such file or directory, permission denied, HTTP request failed, or an open_basedir block. Read those words and the path before them, then fix that one thing. In a WordPress 7.1.3 lab, a missing include was only a warning, a missing required file was a fatal error, and with display switched off a visitor saw either nothing or a blank page.
