PHP uploads the instance code to prevent repeated uploads. This upload instance code is very suitable for beginners of php to learn and has detailed annotations.
<? Php
Session_start ();
/****** The following can be used to track users:
Else $ sess_id = session_id ();
Between $ id = rand (between 0000000000,9999999999999999 );
******/
If (commit $ _ POST ["Submit"]) {
/****** The following is to prevent repeated uploads, which is applicable only once.
If (Response $ _ SESSION ["name"] = "1 "){
Echo "<p> Please do not submit it again! </P> ";
Exit;
}
******/
Program $ file_name = program $ _ FILES ["file"] ["name"];
Objects $ file_size = objects $ _ FILES ["file"] ["size"];
Parameters $ file_type = parameters $ _ FILES ["file"] ["type"];
Consumed $ file_tn = time (). consumed $ file_name;
Optional $ save_path = "upfiles /";
Except $ messg = "<p> when an object is uploaded: </p> <a href =? Id = ". Retry $ id."> return retry </a> ";
Required $ messg_sr = required $ messg;
If (Bytes $ file_type! = "Application/msword") {// breeze prompt, the upload format is limited to word
Optional $ messg. = "<p> the format of the uploaded file is MS wordand the general extension name is .doc </p> ";
}
If (Response $ file_size> 1048576) {// breeze prompt, which can be written as "if (Response $ file_size> 1*1024*1024) {" Easy to modify
Created $ messg. = "<p> the size of the uploaded file cannot exceed 1 MB. The size of this file is ". round (Bytes $ file_size/1024/1024), 2 ). "MB </p> ";
}
If (else $ messg! = Orders $ messg_sr ){
Echo done $ messg;
} Else {
If (move_uploaded_file (packages $ _ FILES ["file"] ["tmp_name"], packages $ save_path. Packages $ file_tn )){
// Resume $ _ SESSION ["name"] = "1"; # prevent repeated uploads from matching the above
// The following are the prompts and jumps for successful uploads:
// Echo "<p> congratulations! The file is uploaded successfully. </P> ";
// Echo "<script language = javascript> close (); </script> ";
// Echo "<script> location. href =; </script> ";
// Echo "<meta http-equiv =" refresh "content =" 0; URL = http://domain.com/test.html ">"; # prototype
Echo "<meta http-equiv =" refresh "content =" 3; URL =/"> <div id =" container "style =" margin: 40px; padding: 40px; text-align: center; font-size: 12px; border: # 0099FF double; "> upload successful! </Div> ";
} Else {
Echo done $ messg;
}
}
} Else {
?>
<! DOCTYPE html PUBLIC "-// W3C // dtd xhtml 1.0 Transitional // EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<Html xmlns = "http://www.w3.org/1999/xhtml">
<Head>
<Meta http-equiv = "Content-Type" content = "text/html; charset = gb2312"/>
<Title> File Upload </title>
<Style type = "text/css">
<! --
. Pt11 {
Font-size: 11pt;
Color: #333333;
}
-->
</Style>
</Head>
<Body>
<Form id = "form1" name = "form1" method = "post" enctype = "multipart/form-data" action = "">
<Table width = "500" border = "0" align = "center" cellspacing = "1" bgcolor = "#666699" class = "pt11">
<Tr>
<Td height = "25" bgcolor = "# 9999FF"> upload </td>
</Tr>
<Tr>
<Td height = "60" align = "center" bgcolor = "# F1F1F1">
<Input name = "file" type = "file" id = "file" size = "32"/>
</Td>
</Tr>
<Tr>
<Td height = "25" align = "center" bgcolor = "# E1E1E1">
<Input type = "submit" name = "Submit" value = "submit"/> </td>
</Tr>
</Table>
</Form>
</Body>
</Html>
<? Php }?>
Start building with 50+ products and up to 12 months usage for Elastic Compute Service
1 on 1 presale consultation
24/7 Technical Support 6 Free Tickets per Quarter Faster Response
Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.
A comprehensive suite of global cloud computing services to power your business
Payment Methods We Support
