What a unique symbol to use to explode?

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I connect to a string data I need using the delimiter ";"
$getJson = sprintf("%s;%s, $var, $var2);

Then get:
explode(';', $getJson);

And there is a problem that in $var2 can be any text and if found the symbol ";" , break wrong.
What you can come up with such a unique character (or character set) that just will not use in the text? Or how to solve this?
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2 Answers

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No, just work with JSON as JSON, and not to fence a Bicycle.
$json = json_encode([$var, $var2]); $array = json_decode($json);
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'?' - if the string does not contain questions
or a double colon "::", but if there can be ip addresses, then that expression will not work.
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