Single and double quotes together as HTML attribute value?

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Is there a way to fix it WITHOUT using HTML entities (Like "), htmlentities() or similar functions?

No, there is not. The double quote (") has special meaning inside a HTML attribute. If you want to put it into an attribute value, you must (this is not a true must but a good rule of thumb. It’s a must if you use attributes delimited by double-quotes as you do in your question) write it as its entity ". There is no way around it.

Actually even <tag attr="this""> is not wrong HTML, too and most browsers can deal with that. However it doesn’t help you because you’re looking for both quotes – single and double – and one of these always in HTML is a delimiter of the attribute value – if you need spaces inside the attribute value (as you do).

However, do not worry about that. It works, and you can express everything you like with that, including the combination of quotes you have.

And actually PHP is there for you to take the burden of “escaping” all those characters just with the htmlspecialchars method doing all the work for you. Inside a PHP string you have the original text – with single and double quotes as you see fit – verbatim.

$myString = 'She said: "I don\'t know."';
printf('<input type="text" name="myInput" value="%s" />'
       , htmlspecialchars($myString));

Just a shortened example that should demonstrate how this works. Online demo.

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