What are some common syntax errors to avoid when working with PHP code in forms?

One common syntax error to avoid when working with PHP code in forms is forgetting to properly concatenate variables within a string. This can lead to unexpected results or errors in the code. To solve this issue, make sure to use the correct concatenation operator (.) when combining strings and variables. Example: Incorrect: ``` echo "Hello, $name"; ``` Correct: ``` echo "Hello, " . $name; ```