php eval 函数

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http://php.net/eval

//获取user_id 内的id的值
// $user['user_id'] = ' "id" => "123454321" ';
eval('$user_id_arr = array(' .$user['user_id']. ');');
$id = $user_id_arr['id']);

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转载自blog.csdn.net/u011944141/article/details/82387613