mysqlnd_azure
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NOTE: For PHP-7.2, requires PHP-7.2.15 or later, for PHP-7.3, requires 7.3.2 or later.
mysqlnd_azure is a redirection plugin for the MySQL native driver for PHP. It is a PHP extension that enables redirection logic for mysqlnd driver. The basic idea is to store redirection
information as the last message in the first login request's OK packet. Then use this redirection information to establish the new connection, if connection succeeds, close the original
connection, and use the new one afterward.
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| CONFIGURING mysqlnd_azure |
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OPTION DESCRIPTION
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mysqlnd_azure.enableRedirect This option is to control enable or disable redirection feature of mysqlnd_azure.
If this is set to off, it will not use redirection.

Available option values:
(Default: preferred)
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off(0)         | - It will not use redirection.
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on(1)          | - If ssl is off, no connection will be made, return error:
               |   "mysqlnd_azure.enableRedirect is on, but SSL option is not set in connection string. Redirection is only possible with SSL."
               | - If on server side redirection is not available, abort the first connection and return error:
               |   "Connection aborted because redirection is not enabled on the MySQL server or the network package doesn't meet meet redirection protocol."
               | - If server supports redirection, but the redirected connection failed for any reason, also abort the first proxy connection.
               |   Return the error of the redirected connection.
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preferred(2)   | - it will use redirection if possible.
               | - If connection does not use SSL, or server does not support redirection, or redirected connection fails 
               |   to connect for any non-fatal reason while the proxy connection is still a valid one, it will fallback 
               |   to the first proxy connection.
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