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I am using the php post request example given on http://code.google.com/apis/chart/docs/post_requests.html for generating chart.

The code: chartserver-image.php

<?php // Create some random text-encoded data for a line chart. header('content-type: image/png'); $url = 'http://chart.apis.google.com/chart'; $chd = 't:'; for ($i = 0; $i < 150; ++$i) { $data = rand(0, 100000); $chd .= $data . ','; } $chd = substr($chd, 0, -1); // Add data, chart type, chart size, and scale to params. $chart = array( 'cht' => 'lc', 'chs' => '600x200', 'chds' => '0,100000', 'chd' => $chd); // Send the request, and print out the returned bytes. $context = stream_context_create( array('http' => array( 'method' => 'POST', 'content' => http_build_query($chart)))); fpassthru(fopen($url, 'r', false, $context)); ?>

another_page.html

<img width='600' height='200' src='chartserver-image.php'>

Right now when i access another_page.html, the image doesn't load when i click on view image it shows

The image “http://localhost/demo/chartserver-image.php” cannot be displayed, because it contains errors.

What is the issue i am unable to understand?

Please help me on this

Thanks

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4 Answers 4

Reset to default
2

Replacing 'content' => http_build_query($chart)))); with 'content' => http_build_query($chart,'', '&')))); resolves the issue.

I have added arg separator '&' to http_build_query() which avoid bug if the arg_separator.output parameter is modified in php.ini.

When i checked phpinfo the arg_separator.output was &amp. That was causing issue so adding '&' to http_build_query() resolves the problem.

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2 Comments

+1 that seems to have solved my problem at stackoverflow.com/questions/3682622/…
oops, sorry, no it didn't -something else did, sorry. But it's a good point to make anyway
1

This will work Absolutely fine... Some mistakes in the above example i think.. they are solved below.

<?php // Create some random text-encoded data for a line chart. header('content-type: image/png'); $url = 'http://chart.apis.google.com/chart'; $chd = 't:'; for ($i = 0; $i < 150; ++$i) { $data = rand(0, 100000); $chd .= $data . ','; } $chd = substr($chd, 0, -1); // Add data, chart type, chart size, and scale to params. $chart = array( 'cht' => 'lc', 'chs' => '600x200', 'chds' => '0,100000', 'chd' => $chd); $query = http_build_query($chart); $fullurl = $url."?".$query; $context = stream_context_create( array( 'http' => array( 'method' => 'GET', 'header' => "Content-type: application/x-www-form-urlencoded\r\n" . "Content-length: 0", ) ) ); $ret = fopen($fullurl, 'r', false, $context); fpassthru($ret); ?>
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0

This works for me:

<?php // Create some random text-encoded data for a line chart. //header('content-type: image/png'); $url = 'http://chart.apis.google.com/chart'; $chd = 't:'; for ($i = 0; $i < 150; ++$i) { $data = rand(0, 100000); $chd .= $data . ','; } $chd = substr($chd, 0, -1); // Add data, chart type, chart size, and scale to params. $chart = array( 'cht' => 'lc', 'chs' => '600x200', 'chds' => '0,100000', 'chd' => $chd); $query = http_build_query($chart); $fullurl = $url."?".$query; $context = stream_context_create( array( 'http' => array( 'method' => 'GET', 'header' => "Content-type: application/x-www-form-urlencoded\r\n" . "Content-length: 0", 'proxy' => 'tcp://X.X.X.X:XXXX' ) ) ); $ret = fopen(fullurl, 'r', false, $context); fpassthru($ret);
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Thanks for replying can you please clarify the need for 'proxy' => 'tcp://X.X.X.X:XXXX'. What is the value should i pass to this variable? Right now i am getting this error Warning: fopen() [function.fopen]: php_network_getaddresses: getaddrinfo failed: No such host is known. in E:\xampp\htdocs\demo\chartserver-image.php on line 33
Warning: fopen(chart.apis.google.com/…; in E:\xampp\htdocs\demo\chartserver-image.php on line 33 Warning: fpassthru(): supplied argument is not a valid stream resource in E:\xampp\htdocs\demo\chartserver-image.php on line 34
I tested it behind a proxy so that's why I had to have the proxy set. I'm no expert in PHP, but it worked for me.
0

I had the identical problem, and I split 

$context = stream_context_create( array('http' => array( 'method' => 'POST', 'content' => http_build_query($chart))));

into two statements:

$x = array('http' => array( 'method' => 'POST', 'content' => http_build_query($chart))); $context = stream_context_create($x);

and that seemed to solve it (please don't ask me why)

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