You didn’t mention the exact error, but I can see a few: String literals must always have quote marks round them, and also you can’t open a PHP block inside another one, or echo inside an echo.
Just close the php block before you start the HTML, and open it again afterwards for the closing bracket – it will be simpler than sorting all those things out:
<?php if($_SESSION["username"]!= $array[2]) { ?>
<a class="btn btn-danger delete_user" href="javascript:void(0)" data-id = '<?php echo $row['id'] ?>'>Delete</a>
<?php } ?>
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solved If statement inside While loop [closed]