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<?php
/**
* Checks if two images contain the same image, pixel by pixel
*
* @param mixed $file1 Filename for picture 1 OR gd image resource
* @param mixed $file1 Filename for picture 2 OR gd iamge resource
* @return boolean true if they are the same, false if not
*/
function imageisthesame($file1, $file2)
{
//echo $file1 . ' - ' . $file2 . "\n";
if (is_string($file1)) {
if (!file_exists($file1)) {
throw new Exception('File 1 does not exist' . $file1);
}
$i1 = imagecreatefromstring(file_get_contents($file1));
if ($i1 === false) {
throw new Exception('Image 1 could no be opened' . $file1);
}
} else {
$i1 = $file1;
}
if (is_string($file2)) {
if (!file_exists($file2)) {
throw new Exception('File 2 does not exist' . $file2);
}
$i2 = imagecreatefromstring(file_get_contents($file2));
if ($i2 === false) {
throw new Exception('Image 2 could no be opened' . $file2);
}
} else {
$i2 = $file2;
}
$sx1 = imagesx($i1);
$sy1 = imagesy($i1);
if ($sx1 != imagesx($i2) || $sy1 != imagesy($i2)) {
//image size does not match
return false;
}
for ($x = 0; $x < $sx1; $x++) {
for ($y = 0; $y < $sy1; $y++) {
$rgb1 = imagecolorat($i1, $x, $y);
$pix1 = array(
'r' => ($rgb1 >> 16) & 0xFF,
'g' => ($rgb1 >> 8) & 0xFF,
'b' => $rgb1 & 0xFF
);
$pix1 = imagecolorsforindex($i1, $rgb1);
$rgb2 = imagecolorat($i2, $x, $y);
$pix2 = array(
'r' => ($rgb2 >> 16) & 0xFF,
'g' => ($rgb2 >> 8) & 0xFF,
'b' => $rgb2 & 0xFF
);
$pix2 = imagecolorsforindex($i2, $rgb2);
//echo implode(',',$pix1) . ' - ' . implode(',',$pix2) . "\n";
if ($pix1 != $pix2) {
return false;
}
}
}
return true;
}//function imageisthesame($file1, $file2)
?>
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