mysqli - how to rectify this "SQL syntax" in php&mysql -

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i'm trying create tagging sys demo here. , i'm stumped why error

you have error in sql syntax; check manual corresponds mariadb server version right syntax use near '#ok )' @ line 1

here code:

$insert=mysqli_query($conn, 'insert `hashtag` (posts) values ('.$data1.')') or die(mysqli_error($conn));

any appreciated.

in mysqli query don't have put $conn . remove , in query put '".$data1."' , check.


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