PHP支持多种格式图片上传(支持jpg、png、gif)
2015-01-24信息快讯网
简单地写了一个PHP的图片上传,可以支持jpg、png、gif等格式的图片,如果你想支持更多的格式,比如bmp,可以自己扩充。不是面向对象的,在这里简单记录下,以便以后取用
此处一次支持上传2个图片,上传后生成原图和质量较差的图,原图用于保存质量高的图片,质量差的图用于网页显示。PHP Code
<?php include_once("db.php"); include_once("dbinfo.php"); $connector = new nmdb($host, $username, $password); $connector -> select_db($database); $work_group = check_input($_POST['work_group']); $name = check_input($_POST['name']); $tel = check_input($_POST['tel']); $id_card = check_input($_POST['id_card']); $work_name = check_input($_POST['work_name']); $place = check_input($_POST['place']); $work1 = check_input($_POST['work1']); date_default_timezone_set('PRC'); $date = date("Y-m-d H:i:s"); $quality = 100; $quality2 = 70; $quality_png = 9; $quality2_png = 7; if(isset($_FILES['work1']) && $_FILES['work1']['error']==0) { $size = getimagesize($_FILES['work1']['tmp_name']); $original = $_FILES['work1']['tmp_name']; $type = $_FILES['work1']['type']; //echo $type; $target_name = date('YmdHis').'_'.preg_replace('`[^a-z0-9-_.]`i','',$_FILES['work1']['name']); $work1 = $target_name; $target = dirname(__FILE__).'/uploads/'.$target_name; switch($type) { case "image/jpeg": $resultImage = imagecreatefromjpeg($original); imagejpeg($resultImage, $target, $quality); break; case "image/png": $resultImage = imagecreatefrompng($original); imagepng($resultImage, $target, $quality_png); break; case "image/gif": $resultImage = imagecreatefromgif($original); imagegif($resultImage, $target, $quality); break; default : die("不支持此文件类型"); exit; } $work1_small = $target_name; $target = dirname(__FILE__).'/uploads/small/'.$target_name; switch($type) { case "image/jpeg": $resultImage = imagecreatefromjpeg($original); imagejpeg($resultImage, $target, $quality2); break; case "image/png": $resultImage = imagecreatefrompng($original); imagepng($resultImage, $target, $quality2_png); break; case "image/gif": $resultImage = imagecreatefromgif($original); imagegif($resultImage, $target, $quality2); break; default : die("不支持此文件类型"); exit; } } if(isset($_FILES['work2']) && $_FILES['work2']['error']==0) { $size = getimagesize($_FILES['work2']['tmp_name']); $original = $_FILES['work2']['tmp_name']; $type = $_FILES['work2']['type']; $target_name = date('YmdHis').'_'.preg_replace('`[^a-z0-9-_.]`i','',$_FILES['work2']['name']); $work2 = $target_name; $target = dirname(__FILE__).'/uploads/'.$target_name; switch($type) { case "image/jpeg": $resultImage = imagecreatefromjpeg($original); imagejpeg($resultImage, $target, $quality); break; case "image/png": $resultImage = imagecreatefrompng($original); imagepng($resultImage, $target, $quality_png); break; case "image/gif": $resultImage = imagecreatefromgif($original); imagegif($resultImage, $target, $quality); break; default : die("不支持此文件类型"); exit; } $work2_small = $target_name; $target = dirname(__FILE__).'/uploads/small/'.$target_name; switch($type) { case "image/jpeg": $resultImage = imagecreatefromjpeg($original); imagejpeg($resultImage, $target, $quality2); break; case "image/png": $resultImage = imagecreatefrompng($original); imagepng($resultImage, $target, $quality2_png); break; case "image/gif": $resultImage = imagecreatefromgif($original); imagegif($resultImage, $target, $quality2); break; default : die("不支持此文件类型"); exit; } } $sql="insert into photo(work_group,name,tel,id_card,work_name,place,work,work_small,date) values('$work_group','$name','$tel','$id_card','$work_name','$place','$work1','$work1_small','$date')"; //echo $sql; $result = $connector -> query($sql) or die(mysql_error()); if($work2 != "" && $work2_small != null) { $sql2="insert into photo(work_group,name,tel,id_card,work_name,place,work,work_small,date) values('$work_group','$name','$tel','$id_card','$work_name','$place','$work2','$work2_small','$date')"; $result2 = $connector -> query($sql2) or die(mysql_error()); } $connector -> close($connector); $page="../upload.php"; echo "<script>alert('上传成功!'); window.location = \"".$page."\";</script>"; ?>
有些问题需要说明下:
JPEG图像生成的图像的质量的是一个范围从0(最低质量,最小的文件大小)到100(最高质量,最大文件大小)。而ImagePNG生成图像的质量范围从0到9的,传入的这个范围以外的参数则该函数不会工作。
判断上传文件的类型,$type = $_FILES['work1']['type'];。
创建各种格式的图片可以使用这些函数:imagecreatefromjpeg()、imagecreatefrompng()、imagecreatefromgif()。
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