Question

I’ve got the following function that generates and saves an image based a text parameter. How can I call this in my file? I tried

INCLUDE 'outPrice.php'; 

to link to the external PHP and called it with this command,

outPrice($text);

To which I got the following response.

Warning: Cannot modify header information - headers already sent 

Any help would be appreciated.

function outPrice($textval){
    $textcolor = '666666';


    $font="bgtbt.ttf";
    $size = 20;
    $padding= 1;
    $bgcolor= "ffffff";

    $transparent = 0;
    $antialias = 0;

    $fontfile = $fontpath.$font;

    $box= imageftbbox( $size, 0, $fontfile, $textval, array());
    $boxwidth= $box[4];
    $boxheight= abs($box[3]) + abs($box[5]);
    $width= $boxwidth + ($padding*2) + 1;
    $height= $boxheight + ($padding) + 0;
    $textx= $padding;
    $texty= ($boxheight - abs($box[3])) + $padding;

    // create the image
    $png= imagecreate($width, $height);


    $color = str_replace("#","",$bgcolor);
    $red = hexdec(substr($bgcolor,0,2));
    $green = hexdec(substr($bgcolor,2,2));
    $blue = hexdec(substr($bgcolor,4,2));
    $bg = imagecolorallocate($png, $red, $green, $blue);

    $color = str_replace("#","",$textcolor);
    $red = hexdec(substr($textcolor,0,2));
    $green = hexdec(substr($textcolor,2,2));
    $blue = hexdec(substr($textcolor,4,2));
    $tx = imagecolorallocate($png, $red, $green, $blue);


    imagettftext( $png, $size, 0, $textx, $texty, $tx, $fontfile, $textval );

    header("content-type: image/jpeg");
    imagejpeg($png, "price".$textval.".jpg");
    imagedestroy($png);

}

Answer 1

How are you invoking this file? If you are calling it inside of an <img> tag, or from a CSS directive, then do as C. Walsh says and check for whitespace in the file (tip: for binary data, don’t include a closing ?> tag in your script) as well as a Byte Order Mark at the beginning of your file (use a HEX editor like PSPad for this).

You may also want to consider, since errors may occur during your image script’s execution, wrapping the script contents in ob_start() and ob_end_clean(), where ob_end_clean() is called just before the headers are sent and the image is generated.

If you are invoking it directly from the file in which you wish to embed the image, then use the following HTML scheme:

<img src="data:image/png;base64,DATADATADATA" alt ="" />

Where DATADATADATA is the base64 encoded version of your image.

See:

1. Data URI Scheme
2. PHP Manual Entry for base64_encode()