Fix a php fatal error on /wp admin/network/admin.phppage=wdeb #6
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To avoid PHP Fatal error on line 12. "Uncaught Error: Cannot access offset of type string on string on line 12" The error occurs, because it tries to access an offset on a string, which is not allowed in PHP. In this case, the issue is with the $opt variable. If the option doesn't exist or is not an array, it will return a string instead of an array. To fix this error, we ensure that the $opt variable is an array before trying to access its offsets.
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