Solution to "Cannot create references to elements of..." reported by php foreach

Today, when I used PHP foreach database to query the results in the project, for the sake of convenience, I did not judge whether the data existed. When I directly used (array) to force-convert the data, the web page could not be opened at first, and it reported 502. I was confused, and suddenly PHP reported "Cannot create references to elements of a temporary array expression" and found the error line. The original code is as follows:

foreach ((array) $net_arr as $k => &$val) {    
    $network[$val['node_ip']][$val['ifname']] = $val;
}

Later, it was changed to the following code and everything returned to normal.

if (!empty($net_arr)) {    
    foreach ($net_arr as $k => &$val) {        
    $network[$val['node_ip']][$val['ifname']] = $val;
    }
}

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