Are mysqli_multi_query php function connect 1 time to db or each query?

Just wonder if the function mysqli_multi_query connect just 1 time开发者_如何学Python to the database or each query?

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Yes because it uses $link as connection id http://php.net/manual/en/mysqli.multi-query.php

And it doesn't actually connect - it only uses already established connection.

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mysqli_multiple_query is more faster then normal query.
A small benchmark:

for ($i=0; $i<1000; $i++) { 
    // 3 queries, each one searching different tables over 1.000.000 records.
};

Results:

mysqli_query: 15.46s
mysqli_multi_query: 13.40s