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Easy to use function to create thumbnail image from image, it very use full for creating catalog display where user need not to enter two file for thumbnail and main image

 PHP | 
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/*thumb.php*/
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if($_GET[image])
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{
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	$image = "imagepath/".$_GET[image];
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	if (!$max_width)
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		$max_width = 200;
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	if (!$max_height)
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		$max_height = 150;
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	$size = getimagesize($image);
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	$width = $size[0];
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	$height = $size[1];
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	$x_ratio = $max_width / $width;
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	$y_ratio = $max_height / $height;
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	if (($height <= $max_height) && ($width <= $max_width))
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		{
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			$tn_height = $height;
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			$tn_width = $width;
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		}
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	elseif (($x_ratio * $height) < $max_height) 
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		{
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			$tn_height = ceil($x_ratio * $height);
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			$tn_width = $max_width;
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		}
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	else {
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		$tn_width = ceil($y_ratio * $width);
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		$tn_height = $max_height;
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		}
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	$src = imagecreatefromjpeg($image);
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	//echo "width".$tn_width."height".$tn_height;
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	//exit;
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	$dst = imagecreatetruecolor($tn_width,$tn_height);
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	imagecopyresampled ($dst, $src, 0, 0, 0, 0, $tn_width, $tn_height, $width, $height);
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	//imagecreateresampled($dst, $src, 0, 0, 0, 0, $tn_width, $tn_height, $width, $height);
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	header('Content-type: image/jpeg');
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	imagejpeg($dst, null, -1);
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	imagedestroy($src);
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	imagedestroy($dst);
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}
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1
<img src="thumb.php?image=abc.jpg"/>