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<?php |
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namespace BilginPro\Agency\Dha; |
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use Carbon\Carbon; |
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use GuzzleHttp; |
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/** |
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* Class Crawler |
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* @package BilginPro\Ajans\Dha |
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*/ |
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class Crawler |
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{ |
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/** |
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* @var string |
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*/ |
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protected $x_code = ''; |
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/** |
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* @var string |
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*/ |
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protected $y_code = ''; |
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/** |
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* @var int |
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*/ |
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protected $summary_length = 150; |
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/** |
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* @var array |
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*/ |
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protected $attributes = [ |
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'limit' => '5', |
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]; |
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/** |
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* Create a new Crawler Instance |
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*/ |
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public function __construct($config) |
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{ |
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$this->setParameters($config); |
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} |
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/** |
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* Does the magic. |
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* @return array |
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*/ |
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public function crawl($attributes = []) |
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{ |
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$this->setAttributes($attributes); |
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$response = $this->fetchUrl($this->getUrl()); |
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$xml = new \SimpleXMLElement($response); |
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$result = []; |
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$i = 0; |
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foreach ($xml->channel->item as $item) { |
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if ($this->attributes['limit'] > $i) { |
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$news = new \stdClass; |
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$news->code = (string)$item->guid; |
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$news->title = (string)$item->title; |
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$news->summary = $this->createSummary($item->description); |
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$news->content = (string)trim(preg_replace('/\s+/', ' ', $item->description)); |
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// preg_replace is for cleaning newlines. |
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$news->created_at = (new Carbon($item->pubDate))->format('d.m.Y H:i:s'); |
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$news->category = $this->titleCase(str_replace('DHA-', '', $item->category)); |
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$news->city = (!empty($item->location) ? $this->titleCase($item->location) : ''); |
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$news->images = []; |
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if (isset($item->photoshd) && count($item->photoshd) > 0) { |
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foreach ($item->photoshd as $image) { |
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$news->images[] = (string)$image; |
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} |
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} |
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$result[] = $news; |
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$i++; |
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} |
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} |
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return $result; |
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} |
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/** |
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* Creates short summary of the news, strip credits. |
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* @param $text |
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* @return string |
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*/ |
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public function createSummary($text) |
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{ |
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if (strpos($text, '(DHA)') > 0) { |
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$split = explode('(DHA)', $text); |
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if (count($split) > 1) { |
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$text = $split[1]; |
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$text = trim($text, ' \t\n\r\0\x0B-'); |
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} |
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} |
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$summary = (string)$this->shortenString(strip_tags($text), $this->summary_length); |
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return $summary; |
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} |
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/** |
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* Sets config parameters. |
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*/ |
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public function setParameters($config) |
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{ |
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if (!is_array($config)) { |
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throw new \InvalidArgumentException('$config variable must be an array.'); |
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} |
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if (array_key_exists('x_code', $config)) { |
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$this->x_code = $config['x_code']; |
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} |
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if (array_key_exists('y_code', $config)) { |
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$this->y_code = $config['y_code']; |
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} |
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if (array_key_exists('limit', $config)) { |
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$this->limit = $config['limit']; |
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} |
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} |
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/** |
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* Sets filter attributes. |
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* @param $attributes array |
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*/ |
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protected function setAttributes($attributes) |
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{ |
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foreach ($attributes as $key => $value) { |
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$this->attributes[$key] = $value; |
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} |
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} |
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/** |
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* Returns full url for crawling. |
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* @return string |
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*/ |
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public function getUrl() |
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{ |
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$url = 'http://ajans.dha.com.tr/dhayharss_resimli.php' |
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. '?x=' . $this->x_code |
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. '&y=' . $this->y_code; |
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return $url; |
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} |
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/** |
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* Fethches given url and returns response as string. |
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* @param $url |
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* @param string $method |
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* @param array $options |
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* |
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* @return string |
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*/ |
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public function fetchUrl($url, $method = 'GET', $options = []) |
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{ |
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$client = new GuzzleHttp\Client(); |
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$res = $client->request($method, $url, $options); |
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if ($res->getStatusCode() == 200) { |
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return (string)$res->getBody(); |
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} |
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return ''; |
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} |
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/** |
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* Cuts the given string from the end of the appropriate word. |
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* @param $str |
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* @param $len |
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* @return string |
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*/ |
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public function shortenString($str, $len) |
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{ |
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if (strlen($str) > $len) { |
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$str = rtrim(mb_substr($str, 0, $len, 'UTF-8')); |
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$str = substr($str, 0, strrpos($str, ' ')); |
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$str .= '...'; |
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$str = str_replace(',...', '...', $str); |
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} |
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return $str; |
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} |
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/** |
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* Converts a string to "Title Case" |
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* @param $str |
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* @return string |
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*/ |
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public function titleCase($str) |
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{ |
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$str = mb_convert_case($str, MB_CASE_TITLE, 'UTF-8'); |
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return $str; |
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} |
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} |
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In PHP it is possible to write to properties without declaring them. For example, the following is perfectly valid PHP code:
Generally, it is a good practice to explictly declare properties to avoid accidental typos and provide IDE auto-completion: