What are common issues with using fopen, fwrite, and fclose in PHP?

Common issues with using fopen, fwrite, and fclose in PHP include not checking for errors when opening a file, not properly handling file permissions, and forgetting to close the file after writing to it. To solve these issues, always check the return value of fopen for errors, set appropriate file permissions using chmod, and remember to close the file using fclose after writing to it.

// Open a file for writing, check for errors
$filename = "example.txt";
$file = fopen($filename, "w");
if ($file === false) {
    die("Error opening file");
}

// Write to the file
fwrite($file, "Hello, World!");

// Set appropriate file permissions
chmod($filename, 0644);

// Close the file
fclose($file);