What are the differences between executing SQL queries in PostgreSQL and MySQL in PHP?

When executing SQL queries in PostgreSQL and MySQL in PHP, the main differences lie in the syntax used for certain SQL statements and functions. For example, PostgreSQL uses the `ILIKE` operator for case-insensitive pattern matching, while MySQL uses `LIKE`. Additionally, PostgreSQL uses the `RETURNING` clause to return values from INSERT, UPDATE, or DELETE statements, while MySQL does not have an equivalent feature. To ensure compatibility when writing PHP code that interacts with both PostgreSQL and MySQL databases, it is important to be aware of these syntax differences and make necessary adjustments in your queries.

// Example of executing a SQL query in PostgreSQL
$query = "SELECT * FROM table_name WHERE column ILIKE 'value'";
$result = pg_query($db_connection, $query);

// Example of executing a SQL query in MySQL
$query = "SELECT * FROM table_name WHERE column LIKE 'value'";
$result = mysqli_query($db_connection, $query);