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How can PHP developers prevent users from removing copyright information in their scripts?

To prevent users from removing copyright information in PHP scripts, developers can use PHP's `__halt_compiler()` function in combination with encryption or obfuscation techniques. By encrypting or obfuscating the copyright information within the script and then using `__halt_compiler()` to stop the script execution before the encrypted/obfuscated copyright information, developers can make it more difficult for users to remove or modify the copyright notice.

php 
<?php
// Encrypt or obfuscate the copyright information
$copyright = base64_encode("Copyright © 2021 Your Company");

// Output the encrypted/obfuscated copyright information
echo $copyright;

// Stop the script execution
__halt_compiler();

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