<?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>
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