the callback function to be executed for each and every
request, as soon as a request finishes
the callback function receives as argument an object with 4 properties
(info, header, body and response)
function mycallback($result) {
everything went well at cURL level
if ($result->response[1] == CURLE_OK) {
if server responded with code 200 (meaning that everything went well)
see http://httpstatus.es/ for a list of possible response codes
if ($result->info['http_code'] == 200) {
see all the returned data
print_r('');
print_r($result);
show the server's response code
} else die('Server responded with code ' . $result->info['http_code']);
something went wrong
($result still contains all data that could be gathered)
} else die('cURL responded with: ' . $result->response[0]);
}
include the Zebra_cURL library
require 'path/to/Zebra_cURL';
instantiate the Zebra_cURL object
$curl = new Zebra_cURL();
process given URLs execute the "mycallback" function for each
request, as soon as it finishes
$curl->header('http://www.somewebsite.com', 'mycallback');
| public header ( mixed $urls, mixed $callback = '' ) : void | ||
| $urls | mixed | A single URL or an array of URLs to process. @param mixed $callback (Optional) Callback function to be called as soon as a request finishes. May be given as a string representing a name of an existing function, as an anonymous function created on the fly via {@link http://www.php.net/manual/en/function.create-function.php create_function} or via a {@link http://www.php.net/manual/en/function.create-function.php closure}. The callback function receives as first argument an object with 4 properties as described below, while any further arguments passed to the {@link header} method will be passed as extra arguments to the callback function: - info - an associative array containing information about the request that just finished, as returned by PHP's {@link http://php.net/manual/en/function.curl-getinfo.php curl_getinfo} function; - headers - an associative array with 2 items: - last_request an array with a single entry containing the request headers generated by the last request; so, remember, if there are redirects involved, there will be more requests made, but only information from the last one will be available; - responses an array with one or more entries (if there are redirects involved) with the response headers of all the requests made; Each entry in the headers' array is an associative array in the form of property => value - body - an empty string as it is not available for this method; - response - the response given by the cURL library as an array with 2 entries: the first entry is the textual representation of the result's code, while second is the result's code itself; if the request was successful, these values will be array(CURLE_OK, 0); consult {@link http://www.php.net/manual/en/function.curl-errno.php#103128 this list} to see the possible values of this property; If the callback function returns FALSE while {@link cache} is enabled, the library will not cache the respective request, making it easy to retry failed requests without having to clear all cache. @return void |
| $callback | mixed | |
| return | void | |
public function header($urls, $callback = '')
{
// iterate through the list of URLs to process
foreach ($urls as $url) {
// add each URL and associated properties to the "_requests" property
$this->_requests[] = array('url' => $url, 'options' => array(CURLINFO_HEADER_OUT => 1, CURLOPT_HEADER => 1, CURLOPT_HTTPGET => 1, CURLOPT_NOBODY => 1, CURLOPT_BINARYTRANSFER => null, CURLOPT_CUSTOMREQUEST => null, CURLOPT_FILE => null, CURLOPT_POST => null, CURLOPT_POSTFIELDS => null), 'callback' => $callback, 'arguments' => array_slice(func_get_args(), 2));
}
// if we're just queuing requests for now, do not execute the next lines
if ($this->_queue) {
return;
}
// if we have to pause between batches of requests, process them sequentially, in batches
if ($this->pause_interval > 0) {
$this->_process_paused();
} else {
$this->_process();
}
}