How can the use of commas and semicolons affect the syntax of PHP code?

Using commas and semicolons incorrectly in PHP code can lead to syntax errors and cause the code to not function properly. Commas are used to separate elements in arrays or arguments in functions, while semicolons are used to terminate statements. Therefore, it is important to use commas and semicolons correctly to ensure that the code is syntactically correct.

// Incorrect usage of commas and semicolons
$array = [1, 2, 3,];
echo "Hello";
echo "World"
```

```php
// Correct usage of commas and semicolons
$array = [1, 2, 3];
echo "Hello";
echo "World";