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Thumbnail0r

Creates a thumbnail of a JPEG, PNG, or GIF, on the fly. It takes user-defined dimensions, and is smart enough to keep the image proportions (if desired, of course).

Info

Source Code ( 184 lines )

<?php 
//	Image thumbnail0r (with an "0" :]) 
//	mike[@]filespanker.com 
// 
//	PARAMETERS: 
// 
//	img:  
//		The image file as relative to THIS script.
//	h: 
//		The thumbnail's height.	Default: 30 
//	w: 
//		The thumbnail's width.	Default: 30 
//	mode: 
//		1		  = stretch:	  The image is resized to height and width 
//		0[default] = proportioned: The image is shrunken, but keeps proportions
//	type: 
//		[optional] 
//		jpg		 = JPEG 
//		gif		= GIF 
//		png		= PNG 
//		If this is not set, it is determined by its file extension. 
// 
//	This script's functions rely completely on your gd lib version. 
// 
//	So, if I recall correctly: 
//		gd v1.5 or lower : GIF 
//		gd v1.6 or higher: PNG 
//		gd v1.8 or higher: PNG and JPEG  
// 
//	So, all three image types should never work on the same gd lib :[ 
//	You can thank Unisys for that. 
//	 
//	Before mailing me, please actually look at the code.   
//Theres not much I could have really screwed up, and its probably an 
//	issue with your gd library.  Try up/downgrading it.  

// Configuration: 


//// CODE 

if (!isset($w)) 
	{
	$w = 50; 
	}

if (!isset($h)) 
	{
	$h = 50; 
	}


SetType($mode,   'integer'); 
SetType($w,	  'integer'); 
SetType($h,	 'integer'); 
SetType($img,	 'string' ); 

function percent($p, $w) 
	{
	return (real)(100 * ($p / $w)); 
	}

function unpercent($percent, $whole) 
	{ 
	return (real)(($percent * $whole) / 100); 
	} 

// Initialization 

// Make sure the file exists... 
if (!file_exists($img)) 
	{ 
	echo "Error: could not find file: $img."; 
	exit(); 
	} 

// If the user defined a type to use. 
if (!isset($type)) 
	{ 
	$ext = explode('.', $img); 
	$ext = $ext[count($ext)-1]; 
		switch(strtolower($ext)) 
			{ 
			case 'jpeg'  :  
				$type = 'jpg'; 
			break; 
			default : 
				$type = $ext; 
			break; 
			} 
	} 

// Create the image... 
switch (strtolower($type)) 
	{ 
	case 'jpg': 
		$tmp = imagecreatefromjpeg($img);	
	break; 

	case 'gif': 
		$tmp = @imagecreatefromgif($img);	
	break; 
	 
	case 'png': 
		$tmp = @imagecreatefrompng($img);	
	break; 
	 
	default: 
		echo 'Error: Unrecognized image format.'; 
		exit(); 
	break; 
	} 

if ($tmp) 
	{ 
	// Resize it 
	 
	$ow  = imagesx ($tmp);	// Original image width 
	$oh  = imagesy ($tmp);	// Original image height 

	if ($mode) 
		{ 
		// Just smash it up to fit the dimensions 
		$nw = $w; 
		$nh = $h; 
		} 
	else 
		{ 
		// Make it proportional. 
		if ($ow > $oh) 
			{ 
			$nw  = $w; 
			$nh = unpercent(percent($nw, $ow), $oh); 		
			} 
		else if ($oh > $ow) 
			{ 
			$nh = $h; 
			$nw = unpercent(percent($nh, $oh), $ow); 
			} 
		else 
			{ 
			$nh = $h; 
			$oh = $w; 
			} 
		} 

	$out = imagecreate($nw, $nh); 
	imagecopyresized($out, $tmp, 0, 0, 0, 0, $nw, $nh, $ow, $oh); 
	imagedestroy($tmp); 
	} 
else 
	{ 
	echo 'Could not create image resource.'; 
	exit; 
	} 


if ($out) 
	{ 
	switch (strtolower($type)) 
		{ 
		case 'jpg': 
			header('Content-type: image/jpeg'); 
			imagejpeg($out); 
		break; 

		case 'gif': 
			header('Content-type: image/gif'); 
			imagegif($out); 
		break; 

		case 'png': 
			header('Content-type: image/png'); 
			imagepng($out); 
		break; 
		} 
	imagedestroy($out); 
	} 
else 
	{ 
	echo 'ERROR: Could not create resized image.'; 
	} 

?>