omundy/scraper_weather_regex.php

## scraper_weather_regex.php
<?php

/*	Advanced scraping demo with "regex" parsing. Retrieves current
 * 	weather in any city and colors the background accordingly.
 *	The math below for normalization could use some work.
 *	Owen Mundy Copyright 2011 GNU/GPL */

?>

<html>
<head>
<style>
body { margin:20; font:1.0em/1.4em Arial, Helvetica, sans-serif; }
.text { font:10.0em/1.0em Arial, Helvetica, sans-serif; color:#000; font-weight:bold; }
.navlist { list-style:none; margin:0; position:absolute; top:20px; left:200px }
.navlist li { float:left; margin-right:10px; }
</style>
</head>

<body onLoad="document.f.q.focus();">

<form method="GET" action="<?php print $_SERVER['PHP_SELF']; ?>" name="f">

	<input type="text" name="q" value="<?php print $_GET['q'] ?>" />
	<input type="submit" />

</form>

<ul class="navlist">
	<li><a href="?q=anchorage+alaska">anchorage</a></li>
	<li><a href="?q=toronto+canada">toronto</a></li>
	<li><a href="?q=new+york+ny">nyc</a></li>
	<li><a href="?q=london+uk">london</a></li>
	<li><a href="?q=houston+texas">houston</a></li>
	<li><a href="?q=linz+austria">linz</a></li>
	<li><a href="?q=rome+italy">rome</a></li>
	<li><a href="?q=cairo+egypt">cairo</a></li>
	<li><a href="?q=new+delhi+india">new delhi</a></li>
	<li><a href="?q=mars">mars</a></li>
</ul>

<?php

// make sure the form has been sent
if (isset($_GET['q']))
{
	// get contents of url in an array
	if ($str = file_get_contents('http://www.google.com/search?q=weather+in+'
						. str_replace(" ","+",$_GET['q'])))
	{

		// use regular expressions to extract only what we need...

		// 1, 2, or 3 digits followed by any version of the degree symbol
		$pattern = "/[0-9]{1,3}[º°]C/";
		// match the pattern with a C or with an F
		if (preg_match_all($pattern, $str, $data) > 0)
		{
			$scale = "C";
		}
		else
		{
			$pattern = "/[0-9]{1,3}[º°]F/";
			if (preg_match_all($pattern, $str, $data) > 0)
			{
				$scale = "F";
			}
		}

		// remove html
		$temp_str = strip_tags($data[0][0]);
		// remove everything except numbers and points
		$temp = ereg_replace("[^0-9..]", "", $temp_str);

		if ($temp)
		{

			// what is the scale?
			if ($scale == "C"){
				// convert ºC to ºF
				$tempc = $temp;
				$tempf = ($temp*1.8)+32;
			}
			else if ($scale == "F")
			{
				// convert ºF to ºC
				$tempc = ($temp-32)/1.8;
				$tempf = $temp;
			}
			// normalize the number
			$color = round($tempf/140,1)*10;
			// cool -> warm
			// scale -20 to: 120
			$color_scale = array(
					'0,  0,255',
					'0,128,255',
					'0,255,255',
					'0,255,128',
					'0,255,0',
					'128,255,0',
					'255,255,0',
					'255,128,0',
					'255,  0,0'
					);

?>

<style> body { background:rgb(<?php print $color_scale[$color] ?>) }</style>
<div class="text"><?php print round($tempc,1) ."&deg;C " ?></div>
<?php print round($tempf,1) ?>&deg;F

<?php

		}
		else
		{
			print "city not found";
		}
	}
}
?>

</body>
</html>
	<?php

	/* Advanced scraping demo with "regex" parsing. Retrieves current
	* weather in any city and colors the background accordingly.
	* The math below for normalization could use some work.
	* Owen Mundy Copyright 2011 GNU/GPL */

	?>

	<html>
	<head>
	<style>
	body { margin:20; font:1.0em/1.4em Arial, Helvetica, sans-serif; }
	.text { font:10.0em/1.0em Arial, Helvetica, sans-serif; color:#000; font-weight:bold; }
	.navlist { list-style:none; margin:0; position:absolute; top:20px; left:200px }
	.navlist li { float:left; margin-right:10px; }
	</style>
	</head>

	<body onLoad="document.f.q.focus();">

	<form method="GET" action="<?php print $_SERVER['PHP_SELF']; ?>" name="f">

	<input type="text" name="q" value="<?php print $_GET['q'] ?>" />
	<input type="submit" />

	</form>

	<ul class="navlist">
	<li><a href="?q=anchorage+alaska">anchorage</a></li>
	<li><a href="?q=toronto+canada">toronto</a></li>
	<li><a href="?q=new+york+ny">nyc</a></li>
	<li><a href="?q=london+uk">london</a></li>
	<li><a href="?q=houston+texas">houston</a></li>
	<li><a href="?q=linz+austria">linz</a></li>
	<li><a href="?q=rome+italy">rome</a></li>
	<li><a href="?q=cairo+egypt">cairo</a></li>
	<li><a href="?q=new+delhi+india">new delhi</a></li>
	<li><a href="?q=mars">mars</a></li>
	</ul>

	<?php

	// make sure the form has been sent
	if (isset($_GET['q']))
	{
	// get contents of url in an array
	if ($str = file_get_contents('http://www.google.com/search?q=weather+in+'
	. str_replace(" ","+",$_GET['q'])))
	{

	// use regular expressions to extract only what we need...

	// 1, 2, or 3 digits followed by any version of the degree symbol
	$pattern = "/[0-9]{1,3}[º°]C/";
	// match the pattern with a C or with an F
	if (preg_match_all($pattern, $str, $data) > 0)
	{
	$scale = "C";
	}
	else
	{
	$pattern = "/[0-9]{1,3}[º°]F/";
	if (preg_match_all($pattern, $str, $data) > 0)
	{
	$scale = "F";
	}
	}

	// remove html
	$temp_str = strip_tags($data[0][0]);
	// remove everything except numbers and points
	$temp = ereg_replace("[^0-9..]", "", $temp_str);

	if ($temp)
	{

	// what is the scale?
	if ($scale == "C"){
	// convert ºC to ºF
	$tempc = $temp;
	$tempf = ($temp*1.8)+32;
	}
	else if ($scale == "F")
	{
	// convert ºF to ºC
	$tempc = ($temp-32)/1.8;
	$tempf = $temp;
	}
	// normalize the number
	$color = round($tempf/140,1)*10;
	// cool -> warm
	// scale -20 to: 120
	$color_scale = array(
	'0, 0,255',
	'0,128,255',
	'0,255,255',
	'0,255,128',
	'0,255,0',
	'128,255,0',
	'255,255,0',
	'255,128,0',
	'255, 0,0'
	);

	?>

	<style> body { background:rgb(<?php print $color_scale[$color] ?>) }</style>
	<div class="text"><?php print round($tempc,1) ."°C " ?></div>
	<?php print round($tempf,1) ?>°F

	<?php

	}
	else
	{
	print "city not found";
	}
	}
	}
	?>

	</body>
	</html>