无法在php中获取请求参数

Question

I am using the following code to get data from $_REQUEST in php:

for($i=0;$i<intval($q);$i++)
    {
       $construct="'".$i."'";
       echo $construct;
       $p=$_REQUEST[$construct];
       echo $p;

    }

where '0','1',... so on have values. But for some reason it does not work. However if I replace it by $_REQUEST['0'] it seems to print the value fine. Any ideas what I am doing wrong?

Answer 1

Your $construct variable's value contains single quotes, which are not necessary. When you write it out as '0' you are indicating an actual value of 0, whereas "'0'" indicates a value of '0'. Your code should read:

for($i=0;$i<intval($q);$i++)
{
   $construct= strval($i);
   echo $construct;
   $p=$_REQUEST[$construct];
   echo $p;
}

or more simply:

for ($i=0; $i<intval($q); $i++) {
   echo $_REQUEST[strval($i)];
}