What are common syntax errors in PHP code that may lead to unexpected errors like the one mentioned in the forum thread?

Common syntax errors in PHP code that may lead to unexpected errors include missing semicolons at the end of statements, mismatched parentheses or brackets, and misspelled function or variable names. These errors can cause the code to break and produce unexpected results.

// Incorrect code with missing semicolon
$name = "John"
echo "Hello, $name!"; // Missing semicolon

// Corrected code
$name = "John";
echo "Hello, $name!";