后端开发|php教程
PHP,图片上传
后端开发-php教程
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
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select_db($database); $work_group = check_input($_POST[work_group]); $name = check_input($_POST[ ame]); $tel = check_input($_POST[ el]); $id_card = check_input($_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][ mp_name]); $original = $_FILES[work1][ mp_name]; $type = $_FILES[work1][ ype]; //echo $type; $target_name = date(YmdHis).\_.preg_replace(`[^a-z0-9-_.]`i,\,$_FILES[work1][ ame]); $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][ mp_name]); $original = $_FILES[work2][ mp_name]; $type = $_FILES[work2][ ype]; $target_name = date(YmdHis).\_.preg_replace(`[^a-z0-9-_.]`i,\,$_FILES[work2][ ame]); $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); $page="../upload.php"; echo "alert(上传成功！); window.location = \"".$page."\";"; ?>
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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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