Use FIND_IN_SET()
to search for an element of a comma-separated list.
$lsc_adminid_query = xtDBquery("
SELECT lsc.option_id
FROM lsc_config lsc
WHERE FIND_IN_SET({$_SESSION['customer_id']}, lsc.option_value)");
But it would be better to normalize your design so you don’t have comma-separated lists in database columns in the first place.
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solved PHP – How to format data for in_array