Ajax & PHP 边学边练 之五 图片处理_PHP教程
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2024-02-17 22:38:04
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在上一篇中讲解了如何通过Ajax提交表单并由PHP处理底层数据,本篇将主要介绍图片的上传与处理。对于文件的上传很简单,只需一个Form便可实现,再通过PHP将源文件上传到目标目录。先上个效果图:
//上传文件需要定义enctype,为了显示图片将target设为uploadframe
enctype="multipart/form-data" target="uploadframe">
Upload a File:
//上传文件
//提交Form
theform.submit();
//在showimg
Sample6_1.php 中创建Form:
Copy to Clipboard引用的内容:[www.bkjia.com] //显示上传状态和图片//上传文件需要定义enctype,为了显示图片将target设为uploadframe
enctype="multipart/form-data" target="uploadframe">
Upload a File:
//上传文件
上传图片函数 uploadimg:
Copy to Clipboard引用的内容:[www.bkjia.com] function uploadimg(theform){//提交Form
theform.submit();
//在showimg
中显示上传状态
setStatus ("Loading...","showimg");
}
//上传状态函数
function setStatus (theStatus, theObj){
obj = document.getElementById(theObj);
if (obj){
obj.innerHTML = "
}
}
$allowedtypes = array("image/jpeg","image/pjpeg","image/png", "image/x-png","image/gif");
//文件存放目录
$savefolder = "images";
//如果有文件上传就开始干活
if (isset ($_FILES['myfile'])){
//检查上传文件是否符合$allowedtypes类型
if (in_array($_FILES['myfile']['type'],$allowedtypes)){
if ($_FILES['myfile']['error'] == 0){
$thefile = "$savefolder/".$_FILES['myfile']['name'];
//通过move_uploaded_file上传文件
if (!move_uploaded_file($_FILES['myfile']['tmp_name'], $thefile)){
echo "There was an error uploading the file.";
}
else{
?>
br />"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
}
}
}
}
?>
setStatus ("Loading...","showimg");
}
//上传状态函数
function setStatus (theStatus, theObj){
obj = document.getElementById(theObj);
if (obj){
obj.innerHTML = "
" + theStatus + "
"; }
}
process_upload.php 提供文件上传功能:
Copy to Clipboard引用的内容:[www.bkjia.com] //提供图片类型校验$allowedtypes = array("image/jpeg","image/pjpeg","image/png", "image/x-png","image/gif");
//文件存放目录
$savefolder = "images";
//如果有文件上传就开始干活
if (isset ($_FILES['myfile'])){
//检查上传文件是否符合$allowedtypes类型
if (in_array($_FILES['myfile']['type'],$allowedtypes)){
if ($_FILES['myfile']['error'] == 0){
$thefile = "$savefolder/".$_FILES['myfile']['name'];
//通过move_uploaded_file上传文件
if (!move_uploaded_file($_FILES['myfile']['tmp_name'], $thefile)){
echo "There was an error uploading the file.";
}
else{
?>
br />"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
}
}
}
}
?>
上面代码最后部分的doneloading 函数就是用来显示图片及修改图片尺寸大小。其中会用到thumb.php,它会在images目录中生成出源图片的大、中、小三个尺寸,有兴趣可以研究一下。欢迎大家拍砖~
源码下载:Sample6.rar
转自:http://www.cnblogs.com/gnielee/
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