How can one ensure that SQL queries in PHP applications are compatible with both SQL 4 and SQL 5 to avoid unknown column errors?

To ensure SQL queries in PHP applications are compatible with both SQL 4 and SQL 5 and avoid unknown column errors, one can use backticks (`) around column and table names in the queries. This helps prevent conflicts with reserved words or differences in SQL versions. 

$query = "SELECT `column1`, `column2` FROM `table` WHERE `column3` = 'value'";
$result = mysqli_query($connection, $query);

if ($result) {
    // Process the query results
} else {
    echo "Error: " . mysqli_error($connection);
}

Keywords

SQL queries PHP applications compatibility unknown column errors SQL 4 and SQL 5

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