Php Image Upload and preview

Php Image Upload and preview effect this article is an image upload code that allows you to preview and modify the image uploaded to the server. If you want to, you can save it, you cannot delete the file and upload it again.

Php tutorial Image Upload and preview
This article is an image upload code. You can preview and modify the image uploaded to the server. If you want to save it, you cannot delete the file and upload it again.
*/
If (! Isset ($ _ session) session_start ();

/** 2010-6-22
* $ The data array type contains the following variables:
-------------------------------
* $ Sub_type submit type (upload: upload button delete: delete button), default upload
* $ File the $ _ files ['filename'] array obtained through the form
* $ Img_tag_id id of the preview image
* $ Img_dir directory for uploading images
* $ Max_file_size unit: m (MB); default value: 1 m
* $ Type_array: supported image types (default: image/pjpeg, image/jpeg, image/gif)
**/
Function upload ($ data ){
If (! $ Data ['file']) {
Echo '<script> alert ("file cannot be blank! "); </Script> '; exit;
}
If (! $ Data ['img _ tag_id ']) {
Echo '<script> alert ("preview Image Tag id cannot be blank! "); </Script> '; exit;
}
If (! $ Data ['img _ dir']) {
Echo '<script> alert ("the Image Upload directory cannot be blank! "); </Script> '; exit;
}
If (! Isset ($ data ['max _ file_size ']) {
$ Data ['max _ file_size '] = 1024*1024;
} Else {
$ Data ['max _ file_size '] = $ data ['max _ 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']) {
If (is_file ($ _ session ['imgpath']) {
$ B = unlink ($ _ session ['imgpath']);
}
Unset ($ _ session ['name'], $ _ session ['imgpath']);
If (! Isset ($ _ session ['name']) {
Echo '<script> alert ("deleted successfully! "); </Script> ';
Echo '<script> parent.doc ument. getelementbyid ("'. $ data ['img _ tag_id ']. '"). style. display = "none"; </script> ';
} Else {
Echo '<script> alert ("deletion failed! "); </Script> ';
}
} Else {
Echo '<script> alert ("No manuscript! "); </Script> ';
} Exit;
}

If (isset ($ _ session ['imgpath']) & $ _ session ['imgpath']) {
Echo '<script> alert ("the manuscript already exists. to upload it again, delete the original manuscript! "); </Script> '; exit;
}
If (! In_array ($ data ['file'] ['type'], $ data ['Type _ array']) {
Echo '<script> alert ("the source is not matched. Upload the. jpg).gif and. PNG images! "); </Script> '; exit;
}
If ($ data ['file'] ['SIZE']> $ data ['max _ file_size ']) {
Echo '<script> alert ("your uploaded manuscript is too large. Please select an image below 2 MB to upload! "); </Script> '; 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 ("An error occurred while uploading the manuscript. please upload it again! "); </Script> '; exit;
} Else {
Echo '<script> alert ("the manuscript is uploaded successfully! "); </Script> ';
}
$ _ 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']: '';
}
?>

<Form action = "ad. php" method = "post" enctype = "multipart/form-data" target = "frame">
<Input type = "file" name = "file" class = "input">
<Input type = "submit" name = "submit_upload" value = "Upload">
<Input type = "submit" name = "submit_delete" value = "delete">
<Iframe id = "frame" name = "frame" width = "0" height = "0" marginwidth = "0" frameborder = "0" src = "about: blank "> </iframe>
</Form>

<Script>
If ("<? Php echo $ imgpath;?> "){
Parent.doc ument. getelementbyid ("picview"). src = "<? Php echo $ imgpath;?> ";
Parent.doc ument. getelementbyid ("picview"). style. display = "block ";
}
</Script>