In PHP development, what are the potential consequences of incorrect usage of quotation marks and parentheses in code snippets?

Incorrect usage of quotation marks and parentheses in PHP code snippets can lead to syntax errors and unexpected behavior. To avoid these issues, it is important to use the correct syntax for enclosing strings and function parameters. Double quotation marks should be used for enclosing strings that require variable interpolation, while single quotation marks should be used for strings that do not require interpolation. Additionally, parentheses should be used to enclose function parameters. Example of correct syntax:

// Using double quotation marks for string with variable interpolation
$name = "John";

// Using single quotation marks for string without variable interpolation
$message = 'Hello, ' . $name;

// Using parentheses to enclose function parameters
echo strtoupper($message);