What are some common reasons for not being able to delete files created in PHP?

One common reason for not being able to delete files created in PHP is insufficient file permissions. Make sure that the file you are trying to delete has the appropriate permissions set to allow deletion. Another reason could be that the file is currently in use by another process, preventing it from being deleted. Ensure that the file is not being accessed by any other scripts or programs before attempting to delete it. 

$file = 'example.txt';

// Check if file exists and has write permissions
if (file_exists($file) && is_writable($file)) {
    unlink($file);
    echo 'File deleted successfully.';
} else {
    echo 'Unable to delete file. Make sure it exists and has the appropriate permissions.';
}

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