Symptoms
The following error is logged to a domains PHP error log where 'php_extension.dll' is a PHP extension, and ea-php## is a PHP version:
PHP Startup: Unable to load dynamic library 'php_extension.dll' (tried: /opt/cpanel/ea-php##/root/usr/lib64/php/modules/php_extension.dll
Example for the iconv extension on PHP 7.2:
PHP Startup: Unable to load dynamic library 'php_iconv.dll' (tried: /opt/cpanel/ea-php72/root/usr/lib64/php/modules/php_iconv.dll
Description
This typically occurs when incorrectly enabling a PHP extension in a php.ini or .user.ini file.
Example:
root@server [~] # cat /home/exampleuser/public_html/php.ini
extension=php_iconv.dll
extension=php_mbstring.dll
Workaround
Remove the lines that are enabling the PHP extension in a php.ini or .user.ini file.
When installing a PHP extension for a PHP version via WHM >> EasyApache 4 or command-line, the extension is automatically enabled via additional .ini files in /opt/cpanel/ea-php##/root/etc/php.d/ where ea-php## is a version of PHP.
Example for the iconv extension on PHP 7.2:
root@server [~] # cat /opt/cpanel/ea-php72/root/etc/php.d/20-iconv.ini
; Enable iconv extension module
extension=iconv.so