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php method to open the mysqli extension: first open the php.ini configuration file; then find [extension=php_mysqli.dll] and uncomment it; finally find [extension_dir] and set the ext path.
Specific steps:
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Open first php.ini configuration file, search for php_mysqli.dll;
and then set the extension_dir directive
; Windows Extensions ; Note that ODBC support is built in, so no dll is needed for it. ; Note that many DLL files are located in the extensions/ (PHP 4) ext/ (PHP 5+) ; extension folders as well as the separate PECL DLL download (PHP 5+). ; Be sure to appropriately set the extension_dir directive. ;一定要适当地设置extension_dir指令。
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Finally search extension_dir in php.ini;
extension_dir = “G:/web/php7.1/ext”
Check whether the G:/web/php7.1/ext installation path is php_mysqli.dll exists (if it does not exist, the PHP installation package may be damaged, please download it again).
After completing the above steps, it will be activated successfully.
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