UPDATE wp_posts
SET post_content = REPLACE(post_content, 'https:', 'http:')
WHERE post_content like '%https:%';

UPDATE wp_posts
SET post_title = REPLACE(post_title, 'https:', 'http:')
WHERE post_title like '%https:%';

<a href="#" cookie-optout-link>Doch keine Cookies!</a>

<div id="cookiequestion">
<style type="text/css">
#cookiequestion{
position: fixed;
text-align: center;
font-weight: bold;
left: 0;
bottom: 0;
border: 2px solid #BBB;
background-color: #DDD;
padding: 10px;
border-radius: 5px;
width: 100%;
}
</style>
<script type="text/javascript">
function cookieclose(val){
var storage = window.localStorage;
if(val && val > 0){
storage.setItem("cookiequestion_val", val);
}
else {
val = storage.getItem("cookiequestion_val");
}

if(val && val > 0){
document.getElementById("cookiequestion").style.display="none";

if(val > 1) {
var event = new Event('cookiequestion_clicked', {value: val, overlay: document.getElementById("cookiequestion")});
document.dispatchEvent(event);
//or do other things here
}
}

//create optional optout-links
var elements = document.querySelectorAll("[cookie-optout-link]");
var func = function(){
return function(){
cookieclose(1);
};
};
for(var i=0; i < elements.length; i++){
elements.addEventListener("click", func());
}
};

cookieclose(0);
</script>
<p>
Erlauben von Tracking/Cookies?
</p>
<p>
<button onclick="cookieclose(2);">ja</button>
<button onclick="cookieclose(1);">nein</button>
</p>
</div>

function convertToCamelCase($text){
$result = '';
$nextUp = false;
for($i = 0; $i < strlen($text); $i++){
$char = substr($text, $i, 1);
if($char == '_'){
$nextUp = true;
}
else if ($nextUp){
$result .= strtoupper($char);
$nextUp = false;
}
else{
$result .= strtolower($char);
}
}
return $result;
}