How can concatenation be used to construct SQL queries in PHP to avoid syntax errors?

When constructing SQL queries in PHP, concatenation can be used to combine strings and variables together to form the query. This helps avoid syntax errors that may occur when using double quotes to include variables directly in the query string. By breaking down the query into smaller parts and concatenating them together, we can ensure that the query is properly formatted and executed without any issues. 

// Example of constructing an SQL query using concatenation to avoid syntax errors
$first_name = "John";
$query = "SELECT * FROM users WHERE first_name = '" . $first_name . "'";
$result = mysqli_query($connection, $query);
if($result){
    // Process the query result
} else {
    echo "Error executing query: " . mysqli_error($connection);
}

Keywords

PHP concatenation SQL queries syntax errors construction

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