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string curl_strerror ( int $errornum )

<?php
// Create a cURL handle with a misspelled URL
$ch = curl_init("htp://example.com/");

// Send the request
curl_exec($ch);

// Check for error code and display error message
if($errno = curl_errno($ch)) {
    $error_message = curl_strerror($errno);
    echo "cURL error ({$errno}):\n {$error_message}";
}

// Close the handle
curl_close($ch);
?>

cURL error (1):
 Unsupported protocol