How can the use of quotation marks around file names impact the functionality of file creation and writing in PHP scripts?

When using quotation marks around file names in PHP scripts, it can lead to issues with file creation and writing as the quotation marks may be interpreted as part of the file name itself. To avoid this problem, it is best to avoid using quotation marks when specifying file names in PHP functions such as fopen() or fwrite().

// Incorrect way with quotation marks around file name
$file = "example.txt";

// Correct way without quotation marks around file name
$file = 'example.txt';