How do I put a notice reminder when somebody remove the powered on my theme footer

Example link on my footer

$powered = 'Powered by <a href="htp://stackoverflow开发者_JS百科.com">Stackoverflow</a>';

theme file

<?php echo $powered; ?>

How to make if $powered removed from my footer and the error/reminder notice it.

Example die('Do not remove the powered link')

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Short answer: not possible.

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Long answer:

<?php

$powered = 'Powered by <a href="htp://stackoverflow.com">Stackoverflow</a>';

ob_start();
echo $powered;
$html = ob_get_clean();

/*
 * If you remove the "echo $powered;" part, please don't remove the following lines
 * so I can detect the license violation. Thank you for your cooperation!
 */
if( strpos($html, $powered)===FALSE ){
    echo die('Do not remove the powered link');
}else{
    echo $html;
}

?>

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It's possible... you can use Zend Guard to protect your code from being altered.