error generating image

[lucydog]

Im completing an exercise in the book: php and mysql web developement - chapter 19.

This is the code:
<?
// set up image
$height = 200;
$width = 200;
$im = ImageCreate($width, $height);
$white = ImageColorAllocate ($im, 255, 255, 255);
$black = ImageColorAllocate ($im, 0, 0, 0);

// draw on image

ImageFill($im, 0, 0, $black);
ImageLine($im, 0, 0, $width, $height, $white);
ImageString($im, 4, 50, 150, "Sales", $white);

// output image
Header ("Content-type: image/png");
ImagePng ($im);

// clean up
ImageDestroy($im);
?>

and I am getting the error:

Warning: Cannot add header information - headers already sent by (output started at c:\program files\apache group\apache\htdocs\simplegraph.php:2) in c:\program files\apache group\apache\htdocs\simplegraph.php on line 16
‰PNG IHDRÈÈ—–<ÝPLTEÿÿÿUÂÓ~õIDATxœuÓKrå @Q/µWÐIUßÀKÓR”èueÀ€ñ 6ºLÏ]UiY ¼EPÅPJDI(¥¬(‚¢(´ Z -…‚–BAK¡ MEQ hÚ‚6 M hÚEPÅÚÅÚÅÚÅÚÅÚÅ😃PÅ :Ä :Ä :Ä :Ä :Ä :EPÅ :Å :Å :Å :Å :Å ª"(ŠâUq‚ª8AUœ *NP'¨‰ (ÊÔdj25™ƒšÌAMæ KEQ¦ K¦ K¦ K¦ K¦ K¦ .‚¢(Ï .Ï .Ï .Ï .Ï .Ï AEQ % D”„’QA£Š¢J@‰( %£Üƒn"(Šb(%¢$”Œr º‹ (Š¡”ˆ’P2ÊôAQC (%¡d”!è)‚¢(†P"JBÉ(=hAQC (%¡d”+hAQC (%¡d”äˆ (Š¡”ˆ’P2J ªò.ß]d[‡ÛU»É;¾ßMÂ(ßö²µJåçg“{P›úßëëóÔþùxY?u”¿/³Kd,ýÿ§ÏvyÛ9ƒ\ (%¡d”#ÈAQC (%¡d”=DPÅPJDI(e "E1”€QJF)+Š (Š¡”ˆ’Pò/})R0ÂoªaIEND®B`‚

I have uncommented the extensions in the php.ini file is there anything else I need to do?

Thanks

[Anon]

The error is not with the php.ini - the error message tells you that you cannot send headers because you've already sent content. Do you have any other thing in the script before that that outputs something to the browser? Also make sure that your first line of the script is "<?" without the quotes.

Diego

[lucydog]

That is all the script there is...

[Anon]

Nope, because PHP is saying that the error happens when the header was sent on "line 16", but counting lines in your code, the header() call is on line 15 - there's another line there you're not telling us about 🙂. Even a blank line before the initial <? is enough to cause the headers to be "already sent".