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# PHP curl_strerror Function [ PHP cURL Reference](#) (PHP 5 >= 5.5.0) curl_strerror — Returns the description of an error code. * * * ## Description string curl_strerror ( int $errornum ) Returns the textual description of the error code. * * * ## Parameters **errornum** A constant from the [» cURL error codes](http://curl.haxx.se/libcurl/c/libcurl-errors.html). * * * ## Return Value Returns the error code description, or NULL for invalid error codes. * * * ## Example The above example will output: cURL error (1): Unsupported protocol * * PHP cURL Reference](#)