php - Weird Unicode Error. - Zen Cart software -

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so, inherited project , i'm coming across weird unicode error website rendering:  now, when use developer tool kit inside zen cart admin panel find error is, says location is: line #0 : <?php, how happen? if knew error being produced post code snippet but, have no idea. suggestions?

ivan gabriele correct referred shadow character: what's  sign @ beginning of source file?

the why resolve issue in visual studio posted here: utf-8 without bom


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