How can PHP syntax affect the execution of SQL queries?

PHP syntax can affect the execution of SQL queries if there are syntax errors in the query string itself. This can lead to SQL errors and prevent the query from being executed successfully. To avoid this issue, it's important to properly format the SQL query string within the PHP code.

// Example of correctly formatting an SQL query string in PHP
$query = "SELECT * FROM users WHERE id = 1";
$result = mysqli_query($connection, $query);
if ($result) {
    // Process the query result
} else {
    echo "Error executing query: " . mysqli_error($connection);
}