What are potential syntax errors that can cause a PHP script to output nothing?

Potential syntax errors that can cause a PHP script to output nothing include missing semicolons at the end of lines, mismatched parentheses or brackets, and typos in function or variable names. To solve this issue, carefully review the code for any syntax errors and use tools like syntax highlighting in code editors or online syntax checkers to identify and correct any mistakes.

<?php
// Incorrect code with missing semicolon
echo "Hello"
echo "World";
?>
```

```php
<?php
// Corrected code with semicolon added
echo "Hello";
echo "World";
?>