如何查看列名是否与yii中的给定数组匹配

Question

How do I find if the column name matches if I have an array? So I have a loop, the name of the column goes from 1 to 6 at the end. Looking to remove the image on click.

This doesn't work. It also doesn't work if I change $i to 1 in $product_id= "product_gallery_"+[$i];

 for ($i=1; $i<=6; $i++)
        {
        $product_img= "product_gallery_"+[$i];
            if($model->getAttributeLabel($product_id)==$image_attr) // not sure about $image_attr either, it was passed from view
            {   
            $filename = $model->$product_img;
            unlink($path.$filename);
            $model->product_gallery_[$i] = "default.png";
            $model->save();
            echo "removed";
            }
        }

Answer 1

PHP uses the . (dot) as the concatenation operator not the + sign.

Also the [] (square brackets) are used to address array elements by key not to access individual variables eg $variable[$key] to access the $key element of the $variable array

for ($i=1; $i<=6; $i++)
{
    $product_img= "product_gallery_".$i;
    if($model->getAttributeLabel($product_id)==$image_attr) // not sure about $image_attr either, it was passed from view
    {   
        $filename = $model->$product_img;
        unlink($path.$filename);
        $model->$product_img = "default.png";
        $model->save();
        echo "removed";
    }
}