Làm cách nào để kiểm tra sự tồn tại của URL trong PHP? (ok)

https://www.geeksforgeeks.org/how-to-check-the-existence-of-url-in-php/

How to check the existence of URL in PHP?

Existence of an URL can be checked by checking the status code in the response header. The status code 200 is Standard response for successful HTTP requests and status code 404 means URL doesn’t exist.

Used Functions:

• get_headers() Function: It fetches all the headers sent by the server in response to the HTTP request.

• strpos() Function: This function is used to find the first occurrence of a string into another string.

Example 1: This example checks for the status code 200 in response header. If the status code is 200, it indicates URL exist otherwise not.filter_none

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<?php // Initialize an URL to the variable$url = "https://www.geeksforgeeks.org"; // Use get_headers() function$headers = @get_headers($url); // Use condition to check the existence of URLif($headers && strpos( $headers[0], '200')) { $status = "URL Exist";}else { $status = "URL Doesn't Exist";} // Display resultecho($status); ?>

Output:

URL Exist

Example 2: This example checks for the status code 404 in response header. If the status code is 404, it indicates URL doesn’t exist otherwise URL exist. filter_none

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<?php // Initialize an URL to the variable$url = "https://www.geeksforgeeks.org"; // Use get_headers() function$headers = @get_headers($url); // Use condition to check the existence of URLif($headers || strpos( $headers[0], '404')) { $status = "URL Doesn't Exist";}else { $status = "URL Exist";} // Display resultecho($status); ?>

Output:

URL Doesn't Exist

Example 3: This example uses curl_init() method to check the existence of an URL.filter_none

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<?php // Initialize an URL to the variable$url = "https://www.geeksfgeeks.org"; // Use curl_init() function to initialize a cURL session$curl = curl_init($url); // Use curl_setopt() to set an option for cURL transfercurl_setopt($curl, CURLOPT_NOBODY, true); // Use curl_exec() to perform cURL session$result = curl_exec($curl); if ($result !== false) { // Use curl_getinfo() to get information // regarding a specific transfer $statusCode = curl_getinfo($curl, CURLINFO_HTTP_CODE); if ($statusCode == 404) { echo "URL Doesn't Exist"; } else { echo "URL Exist"; }}else { echo "URL Doesn't Exist";} ?>