PHP - 为foreach（）警告消息提供的参数无效

Question

$data = file_get_contents($file);

$fexplode = explode(PHP_EOL, $data);

foreach ($fexplode as $uline) {
     foreach (unserialize($uline) as $item => $value){ 
         echo $item . " :  ";
         echo $value;
     }
} 

运行此代码时，在我的页面上出现“警告：为foreach（）提供的参数无效”警告

Answer 1

以下方式使用

$data = file_get_contents($file);

$fexplode = (!empty($data)?explode(PHP_EOL, $data):array()); // use !empty otherwise make empty array

foreach ($fexplode as $uline) {
     foreach (unserialize($uline) as $item => $value){ 
         echo $item . " :  ";
         echo $value;
     }
}