The example PHP code made available here is incorrect:
http://code.google.com/apis/chart/docs/post_requests.html
Here's the code:
====================================
<?php
// Create some random text-encoded data for a line chart.
header('content-type', 'image/png');
$url = 'http://chart.apis.google.com/chart';
====================================
The second argument to header() is supposed to be a boolean flag
specifying whether it should replace a pre-existing header of the same
name. The correct usage would be:
====================================
header('content-type: image/png');
====================================
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