PHP上传图片生成多张不同尺寸缩略图示例源码

使用方法

<?php
require_once('functions.php');

if(isset($_FILES['image_file_input']))
 {
	$output['status']=FALSE;
	set_time_limit(0);
	$allowedImageType = array("image/gif",   "image/jpeg",   "image/pjpeg",   "image/png",   "image/x-png"  );
	
	if ($_FILES['image_file_input']["error"] > 0) {
		$output['error']= "File Error";
	}
	elseif (!in_array($_FILES['image_file_input']["type"], $allowedImageType)) {
		$output['error']= "Invalid image format";
	}
	elseif (round($_FILES['image_file_input']["size"] / 1024) > 4096) {
		$output['error']= "Maximum file upload size is exceeded";
	} else {
	    $temp_path = $_FILES['image_file_input']['tmp_name'];
		$file = pathinfo($_FILES['image_file_input']['name']);
		$fileType = $file["extension"];
		$fileName = rand(222, 888) . time() . ".$fileType";
		
		$small_thumbnail_path = "uploads/small/";
		createFolder($small_thumbnail_path);
		$small_thumbnail = $small_thumbnail_path . $fileName;
		
		$medium_thumbnail_path = "uploads/medium/";
		createFolder($medium_thumbnail_path);
		$medium_thumbnail = $medium_thumbnail_path . $fileName;
		
		$large_thumbnail_path = "uploads/large/";
		createFolder($large_thumbnail_path);
		$large_thumbnail = $large_thumbnail_path . $fileName;
		
		$thumb1 = createThumbnail($temp_path, $small_thumbnail,$fileType, 150, 93);
		$thumb2 = createThumbnail($temp_path, $medium_thumbnail, $fileType, 300, 185);
		$thumb3 = createThumbnail($temp_path, $large_thumbnail,$fileType, 550, 340);
				
		if($thumb1 && $thumb2 && $thumb3) {
		    $output['status']=TRUE;
		    $output['small']= $small_thumbnail;
		    $output['medium']= $medium_thumbnail;
        		$output['large']= $large_thumbnail;
		}
	}
	echo json_encode($output);
}
?>