如果$ var> 0第一个数组结果始终为null

Question

我正在尝试使用此代码抓取Google Images并将其返回到JSON数组，此代码工作正常，但如果我使用if $img > 0，则第一个结果（0节点）始终返回Null，

有人可以告诉我如何解决此问题吗？

$search_query = "ginger pie cake site:pinterest.com"; 
$search_query = urlencode( $search_query );
$goourl = "https://www.google.com/search?q=".$search_query."&client=firefox-b-ab&tbs=isz:l,itp:photo&tbm=isch&sa=G&tbas=0&biw=1608&bih=817&dpr=0.9#imgrc=_";


$ch = curl_init($goourl);
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
curl_setopt($ch, CURLOPT_USERAGENT, 'Mozilla/5.0 (X11; Linux i686; rv:20.0) Gecko/20121230 Firefox/20.0');
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false);
$output = curl_exec($ch);   


$array_getimg = explode("\"ou\":\"", $output);
$sresult = [];
foreach($array_getimg as $img => $imgurl){
  if ($img > 0) 
    {
    $array_getimg_2 = explode("\",\"", $imgurl);
    $item['img'] = $array_imgurl[] = $array_getimg_2[0];
    }
    $sresult[] = $item;   
}

var_dump($sresult);