How can one ensure that new guestbook entries are added to the beginning of a file without overwriting existing entries in PHP?

To ensure that new guestbook entries are added to the beginning of a file without overwriting existing entries in PHP, you can read the existing entries from the file, append the new entry to the beginning of the array, and then write the updated entries back to the file. 

// Read existing entries from the file
$entries = file('guestbook.txt', FILE_IGNORE_NEW_LINES);

// Add new entry to the beginning of the array
array_unshift($entries, $newEntry);

// Write updated entries back to the file
file_put_contents('guestbook.txt', implode("\n", $entries));

Keywords

file handling array_unshift fopen fseek fwrite

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