PHP image upload and preview effect_PHP tutorial

PHP image upload and preview effect. This article is an image upload code. It can preview and modify the image uploaded to the server. If it is what you want, you can save it. You can not delete it and re-upload it.

PHP tutorial image upload and preview effect
This article is an image upload code. It can preview and modify the image uploaded to the server. If it is what you want, you can save it. It cannot be deleted. Re-upload it.
*/
if(!isset($_session))session_start();

/**2010-6-22
* $data array type contains the following variables
----------------------------------
* $sub_type submit type (upload: upload button delete: delete button), default upload
* $file $_files['filename'] array obtained through form
* $img_tag_id Preview image The id value of img>
* $img_dir The directory for uploading pictures
* $max_file_size in m (megabytes), default: 1m
* $type_array The types of images allowed to be uploaded (default: image/pjpeg, image /jpeg、image/gif)
**/
function upload($data){
if( !$data['file']){
                                              echo '<script>alert("file cannot be empty!"); data['img_tag_id']){<br /> echo '<script>alert("Preview image tag id cannot be empty!");</script>';exit;
}
if(! $data['img_dir']){
echo '<script>alert("The image upload directory cannot be empty!");</script>';exit;
}
if(! Isset ($ Data ['Max_file_size']) {
$ Data ['Max_file_size'] = 1024 * 1024;
} Else {
$ Data ['Max_file_size'] _file_size ' ] * 1024 * 1024;
}
if(!isset($data['type_array'])){
$data['type_array'] = array('image/pjpeg', 'image/ jpeg', 'image/gif');
}
if(!isset($data['sub_type'])){
$data['sub_type'] = 'upload';
}

$imgpath = '';

if(isset($data['sub_type']) && $data['sub_type'] == 'delete'){

if(isset( $_session['name']) && $_session['name']){
                                                                                                                                                         );
}
unset($_session['name'], $_session['imgpath']);
if(!isset($_session['name'])){
echo '<script>alert("Deleted successfully! ");</script>';
                                                                                                            echo '<script>parent.document.getelementbyid("'.$data['img_tag_id'].'").style.display = "none";< /script>';<br />                                                                                                                                                                                          echo '< 🎜> echo '<script>alert("No manuscript!");</script>';
                  }exit;                                

if(isset($_session['imgpath']) && $_session['imgpath']){
echo '<script>alert("The manuscript already exists. Please delete the original manuscript if you want to re-upload it. ! ");</script>';exit;
}
if(!in_array($data['file']['type'], $data['type_array'])){
        echo '<script>alert("The manuscript type does not match, please upload images in .jpg, .gif and .png format!");</script>';exit;
 }
 if( $ Data ['file'] ['size'] & gt; $ data ['max_file_size']) {
Echo '& LT; Script & GT; Alert ("The manuscript you uploaded is too large, please select pictures of less than 2m! ");';exit;
}

if(!is_dir($data['img_dir'])){
@mkdir($data['img_dir'] , 0777, true);
}
$imgpath = $data['img_dir'].'/'.date('his', time()).rand(100, 999).$data[' file']['name'];
$isupload = move_uploaded_file($data['file']['tmp_name'], $imgpath);
if(!$isupload){
echo '< ;script>alert("Manuscript upload failed, please try to upload again!");';exit;
                                                                                                                Manuscript uploaded successfully! );';
}
$_session['name'] = $data['file']['name'];
$_session['imgpath'] = $imgpath ;

return $imgpath;

}

/*test_start*/

$sub_type = '';
if(isset($_post['submit_upload']) )$sub_type = 'upload';
if(isset($_post['submit_delete']))$sub_type = 'delete';
if($sub_type){//echo '<script>alert( "'.$sub_type.'");</script>';exit;
$data = array( 'sub_type' => $sub_type,
'file' => $_files['file '],
'img_tag_id' => 'picview',
'img_dir' => 'upload_img',
);
$imgpath = upload($data);
} else{
$imgpath = isset($_session['imgpath'])? $_session['imgpath']: '';
}
?>

 

<script><p>if( "<?php echo $imgpath; ?>"){<br /> parent.document.getelementbyid("picview").src = "<?php echo $imgpath; ?>";<br /> parent. document.getelementbyid("picview").style.display = "block";<br />}<br /></script>

http://www.bkjia.com/PHPjc/444841.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/444841.htmlTechArticlephp image upload and preview effect This article is an image upload code, which can upload images to the server in Make preview changes and save them if they are what you want. If not...