PHP determines whether the remote image can be called

This time I will bring you PHP to determine whether a remote image can be called. What are the precautions for PHP to determine whether a remote image can be called? The following is a practical case, let's take a look. Note: When making a picture preview, I encountered a problem, which is to determine whether the

exists (not the same server). Examples, multiple methods to determine whether remote images exist.

Code description: 
Method one, returns FALSE regardless of whether the picture is present;
Method two, feasible under windows, returns TRUE regardless of whether the picture is present under LINUX;
Method 3 should be the most appropriate
In addition: There are efficiency issues with the get_headers() method, and it is recommended not to use it as this solution. 

fsockopen version:
";
    print_r($headers);
 Use 
http status code
 to determine whether the file exists. For example, responses 302, 301, 404, etc. all mean that it does not exist. If it is 200, 304, etc., it can Treat the file as existing. 1, fopen() method: 


2, CURL method: 

 I believe you have mastered the method after reading the case in this article. For more exciting information, please pay attention to other related matters on the php Chinese website article! 
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