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PHP Discussion Thread
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Jul 10th, 2006

Image Generation Problem

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See, I am using the following PHP code to generate a PNG image file

PHP Syntax (Toggle Plain Text)
<?php
// create a 100*30 image
$im = imagecreate(100, 30);
 
// white background and blue text
$bg = imagecolorallocate($im, 255, 255, 255);
$textcolor = imagecolorallocate($im, 0, 0, 255);
 
// write the string at the top left
imagestring($im, 5, 0, 0, "Hello world!", $textcolor);
 
// output the image
header("Content-type: image/png");
imagepng($im);
?>
<?php
// create a 100*30 image
$im = imagecreate(100, 30);

// white background and blue text
$bg = imagecolorallocate($im, 255, 255, 255);
$textcolor = imagecolorallocate($im, 0, 0, 255);

// write the string at the top left
imagestring($im, 5, 0, 0, "Hello world!", $textcolor);

// output the image
header("Content-type: image/png");
imagepng($im);
?>

The above code works absolutely fine if I am running on the top of my webpage,

But if I try to run anywhere in between my page, then it generates the following error

PHP Syntax (Toggle Plain Text)

The image "http://localhost" cannot be displayed, because it contains erros

I know this is due to because I am passing the header after the HTML codes, but if I try to pass the header before any HTML tag then I get the same error as above.

Any suggestions?

PS: I want to make a graphical counter at the bottom of my page, and this is the reason I need this code to work. Or is there any alternative????

Kindly Help

God Bless

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cancer10

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Posting Whiz in Training

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since Dec 2004

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Jul 11th, 2006

Re: Image Generation Problem

header stuff has to come out before anything else is printed to the screen. Try splitting the code in two. Put the header at the top and then move your image code to where you need it.

barnamos

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Junior Poster in Training

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since Mar 2005

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Jul 11th, 2006

Re: Image Generation Problem

Just make a html image tag and call your image counter script from that tag!

// add to your html output page

[PHP]<img src='/my_counter.php?page=index' height='24' width='100' alt='' />[/PHP]

example counter file content

file name = index

PHP Syntax (Toggle Plain Text)

0000000000

// my_counter.php

[PHP]<script language='php'>

/* path to counter files */

$path = './counters/';

/* default count, invalid page or no page or counter file doesn't exist */

$count = 0;

if ( ! empty ( $_GET['page'] ) )
{
$p = trim ( $_GET['page'] );

if ( preg_match ( "/^[a-z]{4,10}$/", $p ) && file_exists ( $path . $p ) )
{
$io = fopen ( $path . $p, 'r+' );
$count = fgets ( $io, 11 );
fseek ( $io, 0 );
fputs ( $io, sprintf ( '%010d', ++$count ) );
fclose ( $io );
}
}

if ( $count == 0 )
{
++$count;
}

$im = imagecreate ( 100, 24 );

$bg = imagecolorallocate ( $im, 255, 255, 255 );

$tc = imagecolorallocate ( $im, 0, 0, 255 );

imagestring ( $im, 5, 6, 4, sprintf ( '%010d', $count), $tc );

header ( 'Content-Type: image/png' );

imagepng ( $im );

imagedestroy ( $im );

</script>[/PHP]

demo!

Last edited by demo; Jul 11th, 2006 at 11:56 am.

demo

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since Jan 2005

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Jul 11th, 2006

Re: Image Generation Problem

Thanx

Problem solved, Plz close this topic

cancer10

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Posting Whiz in Training

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since Dec 2004

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Jul 13th, 2006

Re: Image Generation Problem

cancer10, you can mark the topic as solved yourself. Up on the menu navigation there's an option for the topic starter to mark the topic as solved.

Puckdropper

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This thread is more than three months old

No one has posted to this discussion for at least three months. Please let old threads die and do not reply to them unless you feel you have something new and valuable to contribute that absolutely must be added to make the discussion complete. Otherwise, please start a new thread in this forum instead.

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