How can missing or misplaced curly braces in PHP code lead to syntax errors?

Missing or misplaced curly braces in PHP code can lead to syntax errors because curly braces are used to define code blocks such as loops, conditional statements, and functions. If a curly brace is missing or misplaced, the PHP interpreter will not be able to properly parse the code structure, resulting in a syntax error. To fix this issue, make sure that all opening curly braces have a corresponding closing curly brace in the correct location.

// Incorrect code with missing curly brace
if ($condition) {
    echo "Condition is true";
// Missing closing curly brace for the if statement
```

```php
// Corrected code with proper curly brace placement
if ($condition) {
    echo "Condition is true";
} // Added closing curly brace for the if statement