How does PHP determine that parameters cannot be empty?

php method to determine whether the parameters cannot be empty: first create a PHP sample file; then use the "array_keys(array_map('trim', $data), '');" method and the if statement to determine whether the parameters are Just leave it empty.

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php batch judgment parameters cannot be empty

The code is as follows:

        //批量判断参数是否为空
        $arr = array_keys(array_map('trim', $data), '');
        if($arr) {
            echo '有参数为空';
        }

rrree

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