Example of whether PHP detects the existence of a remote file

$url = ' http://xxxx.com '; $hander _array = get_headers ($url); if ($header _array [0] = = ' http/1.1 OK ') { echo ' file exists '; } else { Echo ' file does not exist '; } Copy Code Description: Get_headers accesses a remote address and returns the HTTP headers sent by the server as an array. The $header[0] is the status code returned by the server (the status code should be the first to return if not unexpectedly). To determine if a file exists on the remote server, just make sure that the status code returned by accessing the file is "http/1.1" (Status code http/1.1 404 Not Found can detect a file does not exist? Readers). For an example of a three-bit HTTP response code, refer to a section of PHP code that detects the existence of a remote file.

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