What should I do if php pdo.dll is not found?

php pdo.dll was not found because php5.4 or above has built-in PDO. The solution is to change the item corresponding to "extension=php_pdo_mssql.dll extension=php_pdo_oci.dll" in the php.ini file. Just open it.

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Open PDO extension not found php_pdo.dll

Follow the tutorial to learn PDO. The way to open the PDO extension is to find extension=php_pdo.dll in php and ini and remove the comment

But I did not find php_pdo.dll in php.ini , I only found the similar extension=php_mysql.dll

So I went to Baidu and found out that PDO is already built-in in php5.4 and above. We don’t need to extend it.

We only need to add it in php.ini Just open the code corresponding to

extension=php_pdo_firebird.dll 
extension=php_pdo_informix.dll 
extension=php_pdo_mssql.dll 
extension=php_pdo_mysql.dll 
extension=php_pdo_oci.dll 
extension=php_pdo_oci8.dll 
extension=php_pdo_odbc.dll 
extension=php_pdo_pgsql.dll 
extension=php_pdo_sqlite.dll

in the file. There is no need to download the php.pdo.dll of the corresponding version of php and put it in ext.

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