Why can't phpforeach access

Why cannot phpforeach access PHPcode $ RSQL = sprintf (self: GETQATT, $ CID); $ us = $ this-& gt; mysql-& gt; getData ($ RSQl ); e. why cannot php foreach access?

PHP code

          $RSQL=sprintf(self::GETQATT,$CID);        $us=$this->mysql->getData($RSQl);        echo $RSQL;        $uc=count($us);        if($uc>0)        {            foreach($us as $u)            {                echo $u['UID'];            }        }

$ Why can't foreach access when uc is clearly greater than 0?

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Print_r ($ us); check out

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Output $ us before foreach

PHP code

If ($ uc> 0) {print_r ($ us); foreach ($ us as $ u) {echo "# TEST #"; echo $ u ['uid'];}
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   Discussion
   
$ Why can't foreach access when uc is clearly greater than 0?
   

  
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That is, there is a problem with the database connection. check it.
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$ Us = $ this-> mysql-> getData ($ RSQl );
Print_r ($ us); // Paste the result to see
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   Discussion
   

   
No problem. if there is anything, how can $ uc be greater than 0?