Using $_GET to change which image to use.

Luigi987 · July 23, 2010

Hello,

I have this PHP script I made that is basically a php dynamic PNG image and I want to be able to use http://example.com/image.php?red to show it with a red background and so on.

Here's my code:

<?php
// are we POSTing data?
if($_POST["name"] && $_POST["line"])
{
updateTags(' <' . substr(stripcslashes($_POST["name"]), 0, 14) . '> ' . substr(stripcslashes($_POST["line"]), 0, 60));
} else { // if not, let's display the tagboard thigny
displayImage();
}

function updateTags($newline)
{
//the data
$data = "$newline";

//open the file and choose the mode
$fh = fopen("archive.txt", "a");
fwrite($fh, $data."\n");

//close the file
fclose($fh);

$file = file('./messages.txt');

// Okay, what this does is:
// 1. Copy lines 0-400 to positions 1-18.
for($i = 1; $i < 29; $i++)
{
	$file[$i] = $file[$i+1];
}
// 2. Replace line 19 with the new line.
$file[29] = "\n" . $newline;
// 3. Write
file_put_contents('./messages.txt',$file);
// 4. Redirect the user to the last page they were on
?><head><META http-equiv="refresh" content="1;URL=<? echo $_SERVER['HTTP_REFERER']; ?>#tagboard"></head><?php
}


function displayImage()
{
$font = "./start.ttf";
        
// This stuff was for testing purposes. 
//$line = "<12345678901234> 618203089397031759542093136045940823181599051328925062729983961751505864647211170984368632377438";
//$bbox = imagettfbbox(6, 0, $font, $line);
//echo $bbox[0] . ', ' . $bbox[1] . "<br>";
//echo $bbox[2] . ', ' . $bbox[3] . "<br>";
//echo $bbox[4] . ', ' . $bbox[5] . "<br>";
//echo $bbox[6] . ', ' . $bbox[7] . "<br>";

      $image = ImageCreateFromPNG("base.png");
$black = imagecolorallocate($image, 0, 0, 0);
imagefill($image, 0, 0, $black);
$white = imagecolorallocate($image, 255, 255, 255);
      $shadow = imagecolorallocate($image, 0x66, 0x66, 0x66);

$file = file('./messages.txt');
imagettftext($image, 6, 0, 0, 8, $white, $font, $file[0]);

for($i = 2; $i <= 30; $i++)
{ // I forget exactly what possessed me to write this line this way.
	imagettftext($image, 6, 0, 0, (8 * $i) + ($i-1), $white, $font, $file[$i-1]);
}

// let's be neat - add the proper header and free allocated memory
header('Content-type: image/png');
header("Expires: Mon, 20 Dec 1998 01:00:00 GMT");
header("Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT"); // cover multiple bases to BLOCK caching so I can just tell it to reload the page
header("Cache-Control: no-cache, must-revalidate");
header("Pragma: no-cache");
imagepng($image);
imagedestroy($image);
}
?>

The place of the thing I wanna change is the:

      $image = ImageCreateFromPNG("base.png");

Part to use another image rather than base.png and use red.png in this example.

Help greatly appreciated.

~Luigi987

Luigi987 · July 23, 2010

Never mind,

I figured it out.

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Using $_GET to change which image to use.

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