This is the script I use on my server to graph media negativity towards each candidate. It runs daily as a cron job.

Candidate_Media_Negativity_Graph.php

<?php

require_once('store_data.php');

class CANDIDATE_DATA_GRAPH 
	{

	private function scan_news_data($first_name, $last_name) 
		{ 

		$candidate_yahoo_data = file_get_contents('https://news.search.yahoo.com/search?fr=uh3_news_vert_gs&type=2button&p=' . $first_name . '%20' . $last_name . '%20');
		$candidate_google_data = file_get_contents('https://www.google.com/search?hl=en&gl=us&tbm=nws&authuser=0&q' . $first_name . '+' . $last_name);
		$candidate_cnn_data = file_get_contents('http://www.cnn.com/search/?text=');
		$candidate_nbc_data = file_get_contents('http://www.nbcnews.com/search/' . $first_name . '%20' . $last_name);
		$candidate_nytimes_data = file_get_contents('http://query.nytimes.com/search/sitesearch/?action=click&contentCollection&region=TopBar&WT.nav=searchWidget&module=SearchSubmit&pgtype=Homepage#/' . $first_name . ' ' . $last_name);


		$consolidated_data = $candidate_yahoo_data . $candidate_google_data . $candidate_cnn_data . $candidate_nbc_data . $candidate_nytimes_data;
		return $consolidated_data;
		}



	private function negativity($negative_candidate_data) 
		{

		$total_negative_counter = 0;

		$negative_adjectives = array('aggressive','aloof','arrogant','belligerent','big-headed','bitchy','boastful','bone-idle','boring','bossy','callous','cantankerous','careless','changeable','clinging','compulsive','cowardly','cruel','cunning','cynical',
'deceitful','detached','dishonest','dogmatic','domineering','finicky','flirtatious','foolish','foolhardy','fussy','greedy','grumpy','gullible','harsh', 
'impatient','impolite','impulsive','inconsiderate','inconsistent','indecisive','indiscreet','inflexible','interfering','intolerant','irresponsible',
'jealous lazy','Machiavellian','materialistic','mean','miserly','moody','narrowminded','nasty','naughty','nervous','obsessive obstinate', 'overcritical','overemotional','parsimonious','patronizing','perverse','pessimistic','pompous','possessive','pusillanimous','quarrelsome','quick-tempered','resentful','rude','ruthless','sarcastic','secretive','selfish','self-centred','self-indulgent','silly','sneaky','stingy', 'stubborn','stupid','superficial','tactless','timid','touchy','thoughtless','truculent','unkind','unpredictable','unreliable', 'untidy',
'untrustworthy','vague','vain','vengeful','vulgar','weak-willed');

		foreach ($negative_adjectives as &$word) 
			{
			$word_results = substr_count(($negative_candidate_data), $word);
			if ($word_results != 0) 
				{
				$total_negative_counter = $total_negative_counter + $word_results;
				}
			}
	
	
		return $total_negative_counter;
		}



	private function positivity($positive_candidate_data) 
		{

		$total_positive_counter = 0;

		$positive_adjectives = array('adaptable','adventurous','affable','affectionate','agreeable','ambitious','amiable','amicable',
'amusing','brave','bright','broad-minded','calm','careful','charming','communicative','compassionate','conscientious','considerate',
'convivial','courageous','courteous','creative','decisive','determined','diligent','diplomatic','discreet','dynamic','easygoing','emotional',
'energetic','enthusiastic','exuberant','fair-minded','faithful','fearless','forceful','frank','friendly','funny','generous','gentle','good',
'gregarious','hard-working','helpful','honest','humorous','imaginative','impartial','independent','intellectual','intelligent','intuitive',
'inventive','kind','loving','loyal','modest','neat','nice','optimistic','passionate','patient','persistent','pioneering','philosophical',
'placid','plucky','polite','powerful','practical','pro-active','quick-witted','quiet','rational','reliable','reserved','resourceful','romantic','self-confident','self-disciplined','sensible','sensitive','sincere','sociable','straightforward','sympathetic','thoughtful',
'tidy','tough','unassuming','understanding','versatile','warmhearted','willing','witty');


		foreach ($positive_adjectives as &$word) 
			{
			$word_results = substr_count(($positive_candidate_data) , $word);
			if ($word_results != 0) 
				{
				$total_positive_counter = $total_positive_counter + $word_results;
				}
			}
		return $total_positive_counter;

		}
	
	public function pass_data_to_chart()
		{
		$trump_data = $this -> scan_news_data('Donald', 'Trump');  
		$sanders_data = $this -> scan_news_data('Bernie','Sanders');
		$clinton_data = $this -> scan_news_data('Hillary','Clinton');

		$trump_negativity = $this -> negativity($trump_data);
		$sanders_negativity = $this -> negativity($sanders_data);
		$clinton_negativity = $this -> negativity($clinton_data);

		$trump_positivity = $this -> positivity($trump_data);
		$sanders_positivity = $this -> positivity($sanders_data);
		$clinton_positivity = $this -> positivity($clinton_data);
		
		$trump_negative_percent = round((($trump_negativity/$trump_positivity) * 100), 2);	
		$sanders_negative_percent = round((($sanders_negativity/$sanders_positivity) * 100), 2);
		$clinton_negative_percent = round((($clinton_negativity/$clinton_positivity) * 100), 2);

		$store_data = new DATA_STORE();
		$store_data -> serialize('grapher_files/election/date.txt', date('M/d'), 30);
		$store_data -> serialize('grapher_files/election/trump.txt', $trump_negative_percent, 30);
		$store_data -> serialize('grapher_files/election/sanders.txt', $sanders_negative_percent, 30);
		$store_data -> serialize('grapher_files/election/clinton.txt', $clinton_negative_percent, 30);

		$store_data -> graph('line_graph', 'trump', 'grapher_files/election/', 'grapher_files/election/date.txt' , 'grapher_files/election/trump.txt');
		$store_data -> graph('line_graph', 'sanders', 'grapher_files/election/', 'grapher_files/election/date.txt' , 'grapher_files/election/sanders.txt');
		$store_data -> graph('line_graph', 'clinton', 'grapher_files/election/', 'grapher_files/election/date.txt' , 'grapher_files/election/clinton.txt');
		}
	

	}

$data = new CANDIDATE_DATA_GRAPH();
$data -> pass_data_to_chart();

?>

store_data.php

<?php
//This is required to serialize arrays and store them as text files.  
//The graph generating library (grapher.php) is the same I uploaded on to here. 
require_once('grapher.php');


class DATA_STORE 
	{

	public function serialize($path_to_file, $data, $max_data_points)
		{ 

		if (!file_exists($path_to_file))
			{
			$data_array = array();
			array_push($data_array, $data);
			$file_create = fopen($path_to_file ,'w');
			$serialized_array = serialize($data_array);
			file_put_contents($path_to_file, $serialized_array);
			fclose($file_create);	
			}

		else 
			{
			$recover_serialized_array = file_get_contents($path_to_file);
			$recovered_array = unserialize($recover_serialized_array);
			$recovered_array = $this -> truncate_array($recovered_array, $max_data_points);
			array_push($recovered_array, $data);
			$serialized_array = serialize($recovered_array);
			file_put_contents($path_to_file, $serialized_array);
			}
			
		}


	public function graph($graph_type, $image_name, $image_directory, $label_file, $data_file)
		{
		$recover_serialized_array_label = file_get_contents($label_file);
		$recovered_array_label = unserialize($recover_serialized_array_label);
		$recover_serialized_array_data = file_get_contents($data_file);
		$recovered_array_data = unserialize($recover_serialized_array_data);
		$graph_data_array = array('value' => $recovered_array_data, 'label' => $recovered_array_label);
		$image_render = new GRAPH_CREATE();
		$image_render -> gather_data($graph_type, 600,1000, $graph_data_array, 0, 0,$image_name, array(10, 200, 28), 1, 20, $image_directory, 0);
		}


	private function truncate_array($array_to_truncate, $max_data_points)
		{
		if (count($array_to_truncate) == $max_data_points)
			{
			array_shift($array_to_truncate);
			}
		return $array_to_truncate;
		}



	}

?>