How to determine if 0 is not equal to empty in php

How to judge whether php is not equal to empty: First create a PHP sample file; then use the foreach loop method and functions such as empty and "is_numeric" to implement the judgment logic of not equal to empty; finally execute the file.

PHP determines that 0 is not empty

determines that 0 is empty or a number, so that 0 will not be Treated as empty

foreach ($param as $k=>$v){
// 为空或者为数字
            if (!empty($v) || is_numeric($v)){
                if ($i == 0){
                    $sign .= $k.'='.$v;
                }else{
                    $sign .= '&' . $k.'='.$v;
                }
            }
            $i++;
        }

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