What best practices should be followed when using OR and AND operators in MySQL queries in PHP?

When using OR and AND operators in MySQL queries in PHP, it is important to properly group conditions using parentheses to avoid unexpected results due to operator precedence. It is recommended to use parentheses to explicitly define the order of operations for complex queries involving both OR and AND operators. 

$query = "SELECT * FROM table_name WHERE (condition1 OR condition2) AND condition3";
$result = mysqli_query($connection, $query);

if(mysqli_num_rows($result) > 0) {
    while($row = mysqli_fetch_assoc($result)) {
        // Process each row
    }
} else {
    echo "No results found.";
}

Keywords

MySQL PHP OR operator AND operator query optimization

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