image_create(), header.....

[Gerard Samuel]

Im trying to use dynamic buttons, and Im trying to figure out how to get
around the header call.
I figure use output buffering, but so far Ive only come up with errors.
Anyone see a better way or any errors in my code.
Thanks

nb: Uncomment the echo() statement to get the error.
--------------------------------------------------
<?php

//echo 'Hey<br>';

function button($word) {
ob_start();
header("Content-Type: image/png");
$im = ImageCreate(100, 50);

$black = ImageColorAllocate($im, 0, 0, 0);
$white = ImageColorAllocate($im, 255, 255, 255);

$start_x = 50 - (strlen($word) * ImageFontWidth(5) / 2);
$start_y = 25 - ImageFontHeight(5) / 2;

ImageString($im, 5, $start_x, $start_y, $word, $white);

ImagePNG($im);
ImageDestroy($im);
ob_end_flush();
}

button('Hello World');

?>

[Miguel Cruz]

You need to put the ob_start() call at the very beginning of your script,
not inside that function. You have to turn output buffering on before ANY
output is generated, if you want to be able to send headers later on.

miguel

[Natalie Leotta]

You can save them and then call them up, but then you have to use a cron or
something to empty out the folder. Here's how I save it:

//Image created and everything up here, this is the very end of it
$myTime = time();
ImagePNG($im, "../spool/jp$myTime.png"); //this creates a unique name
chmod("../spool/jp$myTime.png", 0666); //leading 0, then the code for the
mode you want
ImageDestroy($im);

print "<img src='../spool/jp$myTime.png' border=0 width=\"520\"
GALLERYIMG=\"NO\" height=\"500\"></td>";

I hope this helps!

-Natalie

//echo 'Hey<br>';

ImagePNG($im);
ImageDestroy($im);
ob_end_flush();
}

button('Hello World');

?>

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[Jerome Houston]

While Natalie's solution is a valid one, i have another....

first - the error you're getting is because the headers are sent AS SOON as
you echo, print or output html outside of your <?php ?> tags. you're echoing
something before you call ob_start();

second- the reason this doesn't work, is because you're trying to write
binary image bytes into an text html page.... I think what you want is
something like this (actually 2 scripts):

script1.php :
<?php
echo 'Hey<br>';
echo '<img src="script2.php?theword=Hello+World">';
?>

script2.php :
<?php

function button($word) {
ob_start();
header("Content-Type: image/png");
$im = ImageCreate(100, 50);

$black = ImageColorAllocate($im, 0, 0, 0);
$white = ImageColorAllocate($im, 255, 255, 255);

$start_x = 50 - (strlen($word) * ImageFontWidth(5) / 2);
$start_y = 25 - ImageFontHeight(5) / 2;

ImageString($im, 5, $start_x, $start_y, $word, $white);

ImagePNG($im);
ImageDestroy($im);
ob_end_flush();
}
button($_GET["theword"]);
?>

----Original Message Follows----
From: "Leotta, Natalie (NCI/IMS)" <Leo...@ims.nci.nih.gov>

I hope this helps!

-Natalie

//echo 'Hey<br>';

ImagePNG($im);
ImageDestroy($im);
ob_end_flush();
}

button('Hello World');

?>

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