Ok , so I'm learning how to use the GD library of PHP to generate polls , images , etc .. The thing is that when it comes to the image output using the imagejpeg function, nothing shows on the screen .. I'd really appreciate your help . For this exercise , I am typing text on a HTML forum , which needs to be put on an image using the GD library , basically putting text on an image . It's pretty straight-forward, I just don't understand why my image won't show .. Below is both the HTML form code and the PHP code .
HTML form.
Code:
<html>
<head> <title> Create Buttons </title> </head>
<body>
<form action ="button.php" method ="post">
<p> Type button text here </p>
<input type="text" name="button_text" size ="20" />
<p> Choose button color: </p>
<input type ="radio" name="color" value="red"> Red <br>
<input type ="radio" name="color" value="green"> Green <br>
<input type ="radio" name="color" value="blue"> Blue <br>
<input type ="submit" value ="Create Button" />
</form>
</body>
</html>
PHP Code:
<?php
Header('Content-type: image/jpeg');
$DOCUMENT_ROOT = $_SERVER['DOCUMENT_ROOT'];
$button_text = $_POST['button_text']; var_dump($button_text);
$color = $_POST['color']; var_dump($color);
if(empty($color) || empty($button_text))
{
echo " Could not create image - form not filled correctly";
exit;
}
$path = $DOCUMENT_ROOT."/uploads/$color-button.jpg";
$im = imagecreatefromjpeg ($path);
$width_image = imagesx($im);
$height_image = imagesy($im);
$width_image_wo_margins = $width_image-(2*18);
$height_image_wo_margins = $width_image-(2*18);
$font_size = 33;
putenv('GDFONTPATH=C:\Windows\Fonts');
$fontname = getenv('GDFONTPATH') . '\comic.ttf';
if(!is_file($fontname))
{
die( "Missing Font");
}
do
{
$font_size--;
$bbox = imagettfbbox($font_size,0,$fontname,$button_text);
$right_text = $bbox[2];
$left_text = $bbox[0];
$width_text = $right_text -$left_text;
$height_text = abs($bbox[7] - $bbox[1]);
}
while($font_size > 8 && ( $height_text > $height_image_wo_margins || $width_text > $width_image_wo_margins));
if ( $height_text > $height_image_wo_margins || $width_text > $width_image_wo_margins)
{
echo "Text given wil not fit on button.<br />";
}
else
{
$text_y = $width_image/2.0 - $width_text/2.0;
$text_x = $height_image/2.0 - $height_text/2.0;
if($left_text < 0)
{
$text_x += abs($left_text); //add factor for left overhang.
}
$above_line_text = abs($bbox[7]);
$text_y += $above_line_text;
$text_y -=2;
$white = imagecolorallocate($im,255,255,255);
imagettftext($im,$font_size,0,$text_x,$text_y,$white,$fontname,$button_text);
imagejpeg($im, NULL,75);
}
imagedestroy($im);
?>
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