Added URL analyzer library

classes/URLanalyzer.php

@@ -0,0 +1,64 @@
+<?php
+/**
+ * URL analyzer
+ * 
+ * Retreivee the source code of a webpage to extracts
+ * its open graph tags
+ * 
+ * @author Pierre HUBERT
+ */
+
+class URLAnalyzer {
+
+	/**
+	 * Analyze a given URL to extract OpenGraph content
+	 * 
+	 * @param string $url The URL to analyze
+	 * @param int $timeout The
+	 * @return array Open graph informations in case of success or
+	 * empty array in case of failure
+	 */
+	public static function analyze(string $url, int $timeout = 15) : array {
+
+		//Initialize curl
+		$ch = curl_init($url);
+		
+		//Set timeout
+		curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, $timeout);
+		
+		//Get the response
+		curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
+		
+		//Perform the request
+		$source = curl_exec($ch);
+		if(!$source)
+			return array();
+		
+		//Analyze response
+		preg_match_all('#<meta (.*?)>#is', $source, $results, PREG_PATTERN_ORDER);
+
+		//Process results
+		$list = array();
+		foreach($results[1] as $entry){
+
+			//Remove spaces
+			$entry = str_replace(array(" =", "= "), "=", $entry);
+
+			//Check if the meta tag represent an interest
+			if(preg_match("/property/", $entry) AND preg_match("/og:/", $entry)){
+
+				//Search for property tag and content tag
+				preg_match("#property=[\"\']og:(.*?)[\"\']#is", $entry, $matches1);
+				preg_match("#content=[\"\'](.*?)[\"\']#is", $entry, $matches2);
+
+				$name = isset($matches1[1]) ? $matches1[1] : 1;
+				$value = isset($matches2[1]) ? $matches2[1] : "";
+				$list[$name] = $value;
+			}
+		}
+
+
+		return $list;
+	}
+
+}