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UPDATE table_name
SET column1=value, column2=value2,...
WHERE some_column=some_value

<?php
$con=mysqli_connect("localhost","username","password","database");
// Check connection
if (mysqli_connect_errno())
{
        echo "Failed to connect: " . mysqli_connect_error();
}

mysqli_query($con,"UPDATE Persons SET Age=36
WHERE FirstName='Peter' AND LastName='Griffin'");

mysqli_close($con);
?>