在 PHP 7.4 中，判断变量值是否为 uri 格式的数据

1、现在需要从一个一维数组中取出 uri 格式的数据。一维数组的打印结果，如图1

图1

array(134) {
  [14]=>
  bool(false)
  [15]=>
  string(0) ""
  [16]=>
  string(6) "center"
  [17]=>
  string(7) "#ffffff"
  [18]=>
  string(95) "https://xxx.s3.us-east-2.amazonaws.com/image/736589fac73c7dfdbf61efadb49a95fb9af16efb.jpeg"
  [19]=>
  string(30) "<p>Image with text overlay</p>"
  [20]=>
  string(8) "Shop Now"
}

2、基于 filter_var 代码实现如下，打印结果如下，不符合预期，其中存在：internal://policy_pages/29

foreach ($images->all() as $image) {
	var_dump($image, filter_var($image, FILTER_VALIDATE_URL));
	echo "\n";
}

string(11) "collections"
bool(false)

bool(false)
bool(false)

string(6) "center"
bool(false)

string(4) "grid"
bool(false)

string(18) "this is collection"
bool(false)

string(19) "main-index-carousel"
bool(false)

string(5) "slide"
bool(false)

bool(false)
bool(false)

string(0) ""
bool(false)

string(6) "center"
bool(false)

string(7) "#ffffff"
bool(false)

string(95) "https://xxx.us-east-2.amazonaws.com/image/736589fac73c7dfdbf61efadb49a95fb9af16efb.jpeg"
string(95) "https://xxx.us-east-2.amazonaws.com/image/736589fac73c7dfdbf61efadb49a95fb9af16efb.jpeg"

string(30) "<p>Image with text overlay</p>"
bool(false)

string(8) "Shop Now"
bool(false)

string(26) "internal://policy_pages/29"
string(26) "internal://policy_pages/29"

3、通过函数 parse_url 获取 scheme，判断是否为 http 或者 https。最后的过滤结果如下，符合预期。如图2

图2

$images = collect($data['sections'])->flatten()->reject(function ($image) {
	return !filter_var($image, FILTER_VALIDATE_URL);
})->reject(function ($image) {
	return !in_array(parse_url($image, PHP_URL_SCHEME), ['http', 'https']);
});
var_dump($images);

object(Illuminate\Support\Collection)#4918 (1) {
  ["items":protected]=>
  array(4) {
    [10]=>
    string(107) "https://cdn.xxx.com/image/2022/04/fa5d91ba9fd60ef1b050560895d2f15c02852f0d9669654de4c01c8b404af3f3.jpeg"
    [24]=>
    string(95) "https://xxx.us-east-2.amazonaws.com/image/736589fac73c7dfdbf61efadb49a95fb9af16efb.jpeg"
    [41]=>
    string(95) "https://xxx.us-east-2.amazonaws.com/image/7a204816a9625475044c8196bfb154b39aa3f12b.jpeg"
    [129]=>
    string(95) "https://xxx.us-east-2.amazonaws.com/image/736589fac73c7dfdbf61efadb49a95fb9af16efb.jpeg"
  }
}