Why is it necessary to close a file using fclose() after writing content to it in PHP?

It is necessary to close a file using fclose() after writing content to it in PHP because it ensures that all data is properly saved and the file resources are released. Failing to close the file can result in data loss or corruption, as well as potential memory leaks. It is a good practice to always close files after writing to them to maintain data integrity and prevent any issues with file handling.

$file = fopen("example.txt", "w");
fwrite($file, "Hello, World!");
fclose($file);