ConnectionAdapterInterface::queryFetch()
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<?php
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  interface ConnectionAdapterInterface {
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Coding Style Compatibility introduced by
Each interface must be in a namespace of at least one level (a top-level vendor name)

You can fix this by adding a namespace to your class:

namespace YourVendor;

class YourClass { }

When choosing a vendor namespace, try to pick something that is not too generic to avoid conflicts with other libraries.

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    public function __construct( $_srv, $_db, $_usr, $_pass);
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    public function query( $_query );
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    public function queryFetch( $_query );
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    public function queryArray( $_query );
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    public function queryInsert( $_query );
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  }
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?>
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Best Practice introduced by
It is not recommended to use PHP's closing tag ?> in files other than templates.

Using a closing tag in PHP files that only contain PHP code is not recommended as you might accidentally add whitespace after the closing tag which would then be output by PHP. This can cause severe problems, for example headers cannot be sent anymore.

A simple precaution is to leave off the closing tag as it is not required, and it also has no negative effects whatsoever.

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