由于我们每天都可以看到 Digg 越来越多地变成一个有趣的图片和视频网站,所以我将注意力转向了 Reddit。 Reddit 似乎更受控制并且对程序员更友好。由于我尊重 Reddit,所以我想我应该编写一个快速教程,介绍如何使用 PHP 检索 URL 的 Reddit 分数。
PHP
<?php
/* settings */
$url = 'https://davidwalsh.name/9-signs-not-to-hire-that-web-guy';
$reddit_url = 'http://www.reddit.com/api/info.{format}?url='.$url;
$format = 'json'; //use XML if you'd like...JSON FTW!
$score = $ups = $downs = 0; //initialize
/* action */
$content = get_url(str_replace('{format}',$format,$reddit_url)); //again, can be xml or json
if($content) {
if($format == 'json') {
$json = json_decode($content,true);
foreach($json['data']['children'] as $child) { // we want all children for this example
$ups+= (int) $child['data']['ups'];
$downs+= (int) $child['data']['downs'];
//$score+= (int) $child['data']['score']; //if you just want to grab the score directly
}
$score = $ups - $downs;
}
}
/* output */
echo "Ups: $ups<br />"; //21
echo "Downs: $downs<br />"; //8
echo "Score: $score<br />"; //13
/* utility function: go get it! */
function get_url($url) {
$ch = curl_init();
curl_setopt($ch,CURLOPT_URL,$url);
curl_setopt($ch,CURLOPT_RETURNTRANSFER,1);
curl_setopt($ch,CURLOPT_CONNECTTIMEOUT,1);
$content = curl_exec($ch);
curl_close($ch);
return $content;
}
?>
解析 JSON 很简单,使用 json_encode 和 true 的值将 JSON 转换为关联数组。我的示例展示了如何获取“上升”和“下降”的数量——而不仅仅是分数。对于每个 API/Web 服务,我强烈建议缓存您的请求结果。
