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php_mysql.dll

Updated: Files Available: 325
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Download and install php_mysql.dll to fix missing or corrupted DLL errors.

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DLL Overview

Last Updated
Jan 5th, 2025
Filename
php_mysql.dll
Company
The PHP Group
Product
PHP
Description
MySQL
Architecture
x86 (32 bit) x86-64 (64 bit)
Metadata Consensus
299/325 Files 92%
Higher percentages indicate stronger agreement across versions. View available versions or browse repository metadata to compare differences between variants.

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About php_mysql.dll

php_mysql.dll is a DLL file (Dynamic Link Library) used by Windows programs to share code and resources. It allows multiple applications to use the same functions, improving performance and reducing redundancy.

AI-assisted overview · Nov 28, 2025

Overview

What Is php_mysql.dll?

php_mysql.dll is an extension library used by older versions of PHP for Windows to provide support for connecting to MySQL databases. It is part of the legacy PHP MySQL extension, which was used heavily by PHP applications written before PHP 5.5.

This DLL is not part of Windows and does not ship with MySQL itself. It was bundled only with older PHP distributions, and many users encounter it inside bundled stacks like XAMPP for Windows, where Apache, PHP, and MySQL/MariaDB are packaged together.

If php_mysql.dll is missing, outdated, or not loaded correctly, PHP scripts that rely on the old mysql_ functions (such as mysql_connect()) will fail.

Common errors include:

"PHP Warning: Call to undefined function mysql_connect()"
"Unable to load dynamic library 'php_mysql.dll'"
"The specified module could not be found."

What Does php_mysql.dll Do?

✔ Provides MySQL Connectivity for Older PHP Versions

php_mysql.dll enables classic PHP functions such as:
  • mysql_connect()
  • mysql_query()
  • mysql_fetch_array()
  • mysql_close()

These functions were widely used by early PHP applications.

✔ Works With MySQL Client Libraries

The extension depends on matching MySQL client DLLs (such as libmysql.dll) to establish database connections.

✔ Deprecated Since PHP 5.5 and Removed in PHP 7+

Modern PHP versions use MySQLi or PDO_MySQL instead. Applications that still depend on php_mysql.dll must run on older PHP builds.

Where Is php_mysql.dll Normally Located?

On a typical PHP installation for Windows, the DLL is located in:

  • PHPFolder/ext/

For example:

  • C:/php/ext/php_mysql.dll
  • C:/Program Files/PHP/ext/php_mysql.dll
  • C:/xampp/php/ext/php_mysql.dll`
  • C:/Program Files/PHP/ext/php_mysql.dll

To load the extension, the php.ini must reference it using: 

extension=php_mysql.dll

What Software Uses This DLL?

php_mysql.dll is used by older PHP applications, especially:

  • Legacy content management systems (CMS)
  • Older website code written before PHP 5.5
  • In-house tools or scripts that were never upgraded to MySQLi or PDO
  • Local development stacks such as XAMPP that ship with older PHP versions and are configured to load php_mysql.dll

If you see a missing‑DLL error involving php_mysql.dll, the application is almost certainly using old PHP code that relies on the deprecated MySQL extension.

Why Do php_mysql.dll Errors Occur?

✔ Running a New PHP Version

Modern PHP versions (PHP 7, 8, 8.1+) no longer include php_mysql.dll.

✔ Incorrect php.ini Configuration

The extension may be referenced in php.ini but missing from the ext folder.

✔ Missing MySQL Client DLLs

php_mysql.dll requires libmysql.dll to exist and match the PHP build.

✔ Using the Wrong Architecture

Mixing versions such as:
  • 64‑bit PHP with 32‑bit DLLs, or
  • Thread‑safe vs. non‑thread‑safe extensions
can prevent the extension from loading.

How To Fix php_mysql.dll Errors

1. Use the Correct PHP Version (Important)

Because php_mysql.dll is deprecated, you must use an older PHP version that still includes it:
  • PHP 5.2
  • PHP 5.3
  • PHP 5.4
  • PHP 5.5 (deprecated but still includes the extension)

On modern XAMPP releases that use PHP 7 or 8, php_mysql.dll is no longer provided at all. In that case you either need to:

  • Install an older XAMPP package with PHP 5.x for legacy projects, or
  • Update the application code to use MySQLi or PDO_MySQL instead of the old mysql_ functions.

Later PHP versions will not load it.

2. Ensure the DLL Exists in the ext Folder

Verify that:
  • php_mysql.dll is inside PHP/ext/
  • php.ini contains: 
extension=php_mysql.dll

3. Add or Restore libmysql.dll

Place libmysql.dll in either:
  • The main PHP folder, or
  • C:/Windows/System32/ (not recommended but historically common)

The version must match the PHP build.

4. Match Architecture (x86 vs x64)

Ensure all components match:
  • PHP build (x86 or x64)
  • Extension DLL architecture
  • MySQL client library version

5. Restart the Web Server

After making changes:
  • Restart Apache, Nginx, or IIS
  • Re-run phpinfo() to confirm the extension is loaded

Summary

php_mysql.dll is the legacy PHP extension that enabled MySQL connectivity for older versions of PHP. It is used only by outdated applications that rely on the old mysql_* functions. Missing-DLL errors usually occur when running modern PHP versions, misconfiguring php.ini, missing libmysql.dll, or mixing architectures. Fixing the issue requires using the correct PHP version, placing the DLL in the ext folder, restoring required client libraries, and restarting the server.

File information is supported by Human Assisted Artificial Intelligence and should be used as a helpful tool. However, it is important to keep in mind that this information may not be up-to-date or entirely accurate.

Troubleshooting DLL Errors

Most errors involving php_mysql.dll occur because the DLL is missing, corrupted, or outdated. In many cases, reinstalling the related application or replacing the DLL resolves the issue. The steps below cover the most common and reliable ways to fix these errors.

Windows DLL Error Examples

This application has failed to start because php_mysql.dll was not found. Re-installing the application may fix this problem.
php_mysql.dll Not Found.

Fixes and Solutions

The first step in resolving DLL errors is to completely uninstall the affected software and reinstall its latest version. We know this does not always solve the problem, which is why DLLme exists. If reinstalling the application does not help, or if you are unsure which app is causing the error, follow the steps below. These are the most common solutions for fixing php_mysql.dll errors.

  • Repair Windows: Make sure Windows is fully updated, then open Windows Terminal or PowerShell as an administrator (search for “PowerShell” in the Start menu, right-click it, and choose “Run as administrator”). This allows you to repair the Windows component store and run the System File Checker (SFC).

    Repair the Windows component store so SFC can pull clean files:

    DISM /Online /Cleanup-Image /RestoreHealth

    Scan all protected system files and automatically repair problems:

    sfc /scannow
  • Uninstall & Reinstall: On this DLL page, check the Company/Product section to identify the related app, then fully uninstall it. If you plan to continue using it, reinstall the latest version. Be sure to save or back up any important data before uninstalling. Windows or antivirus software may sometimes quarantine DLL files, especially if the DLL is unfamiliar or appears suspicious. Check your antivirus quarantine or logs to determine if this is the cause of your issue.
  • Download the DLL: Download the latest 32-bit or 64-bit version of the DLL directly from our repository using the download button above. Most users will need the 64-bit version, but if you are unsure, or if a 64-bit version is not available, you can install both the 32-bit and 64-bit DLLs. DLLme verifies DLLs that come from our admins, partners, and trusted affiliates. User-uploaded files may be verified later if a trusted source is confirmed.
  • Register the DLL: Most DLL files do not need registration, but some DLLs are COM components and must be registered to work correctly. If registration is required, open Windows Terminal or PowerShell as an administrator.

    Register the DLL (you can also drag the DLL file into the window to automatically fill in its full path): 

    regsvr32 "C:\path\to\php_mysql.dll"

    If you are registering a 32-bit DLL on 64-bit Windows, use the 32-bit RegSvr32: 

    C:\Windows\SysWOW64\regsvr32 "C:\path\to\php_mysql.dll"

    Or open Windows Terminal/PowerShell in the DLL’s folder and run: 

    regsvr32 php_mysql.dll

How to Install php_mysql.dll

To install php_mysql.dll, place the DLL file in the appropriate Windows system folder or in the same folder as the application’s .exe file. If you are not sure which version (32-bit or 64-bit) to use, you can safely install both.

On 64-bit versions of Windows, place 64-bit DLL files in:

C:\Windows\System32\php_mysql.dll

Place 32-bit DLL files in:

C:\Windows\SysWOW64\php_mysql.dll

Or place the DLL file next to the application’s .exe:

C:\path\to\exe\php_mysql.dll

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