Question

I m not sure about an error I m getting while accessing a two-dimensional array in PHP. Basically my var_dump() gives me the following:

 array(1) {
   [ x ]=>
     string(1) "3"
 }
 array(1) {
   [ y ]=>
     string(3) "3"
 }

 array(1) {
   [ x ]=>
     string(1) "5"
 }
 array(1) {
   [ y ]=>
     string(3) "5"
 }

Var_dump是不正确的, 并展示了我想要实现的结果。

What I m doing is the following: 1) preparing x and y coordinates within an $points array 2) check if some numbers are within the coordinates given:

    function check_collisions {
    $points = array();
    for($y = 0; $y < count($this->Ks); $y++)
    {
        $points[][ x ] = $this->Ks[$y][0]; // first is 3, second is 5 - see var_dump above
        $points[][ y ] = $this->Ks[$y][1]; // first is 3, second is 5 - see var_dump above
    }


    for($p = 0; $p < count($points); $p++)
    {
        for($r = 0; $r < count($this->Ns); $r++)
        {
            if($points[$p][ x ] >= $this->Ns[$r][0] && $points[$p][ x ] <= $this->Ns[$r][2])
            {

                if($points[$p][ y ] >= $this->Ns[$r][1] && $points[$p][ y ] <= $this->Ns[$r][3])
                {

                    $collisions++;
                }
            }
        }
    }
    return $collisions;
    }

My PHP now tells me that x and y are undefined indexes within the two if conditions. Is there anything wrong? The other indexes are working well, like accessing $this->Ns etc. Any ideas?

Answer 1

更改环的 , 使其看起来像 :



for($y = 0; $y < count($this->Ks); $y++)
{
    $points[] = array( x  => $this->Ks[$y][0],  y  => $this->Ks[$y][1]);
}


当指定 $points[]  时,没有索引,它每次都会附加到数组中。您正在将两个阵列附加到每个循环 $points ,而不是带有坐标的单数组。

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