Function editor prepends quote to equal sign

Hi,

Im trying to export some data to CSV, so that it can then be imported into google sheets. More specifically, I want to export a string that would already be pre-formated for google sheet’s image function

For this, im using the function editor and made something as such :

<?php

function gsheet_image($value){
	return "=image(\"".$value."\",4,150,150)";
}
?>

And then calling this on the field I am exporting. Overall, it -almosts- works, but for some reason, the export prepends a single quote at the beginning, meaning that it does not work in sheets anymore

It looks like :
‘=image(“{url}”,4,150,150)
instead of just
=image(“{url}”,4,150,150)

Im unsure as to why this happens. Ive tried a couple of different ways, but it either isnt outputing an equal sign, and when it is, then its always prepended with a quote, breaking formating for gsheet

Any fix / idea ?