PHP for multiple users to achieve the replacement avatar function _php instance

A web site, in fact, is a few specific features of a combination, and the replacement of the user avatar is in these functions. Today to do a test, for different users, to achieve Avatar upload function.

First show you the finished product effect chart:

Ideas

For different users to upload avatar, we want to create a folder for each logged-on user, the name of the folder is the user name of the current user.

After the user uploaded successfully, jump to the user login successfully after the page, and refresh the user avatar.

Landing page

Form making

 <form role= "form" action= "/forindex.php" > <div class= "Form-group" > <
Label for= "Name" > Username </label> <input type= "text" class= "Form-control" id= "username" name= "username"
placeholder= "Please enter name" > </div> <div class= "Form-group" > <label for= "inputfile" > File input </label> <input type= "Password" id= "inputfile" name= "password" > <p class= "Help-block" > here is an example of block-level help text. </p> </div> <div class= "Form-group" > <label> Please enter verification code </label> <input type= "text" id= " Checkcode "name=" Checkcode "/>  "/><a href=" javascript:void (0); "onclick=" Change () "> Can't see </a> </div> <script> function 
Change () {document.getElementById ("Imagecheckcode"). src = "./store.php?r=" + math.random (); } </script> <button type= "Submit" class= "BTN Btn-default" > Submit </button> </form> 

Verify code creation

<?php session_start ()//must be declared at the very beginning of PHP to open session//Use GD Imagecreatetruecolor (); Create a background image $image =
Imagecreatetruecolor (100,40);
Generate Fill Color $bgcolor = imagecolorallocate ($image, 255,255,255);
Fills the fill color onto the background image Imagefill ($image, 0,0, $bgcolor);
Generates a random 4-digit letter and a digital hybrid verification code $checkcode = '; For ($i =0 $i <4; $i + +) {$fontsize = rand (6,8); $fontcolor = Imagecolorallocate ($image, Rand (0,255), Rand (0,255), Rand (
0,255));
In order to avoid the user difficult to identify, removed some ambiguous letters and numbers $rawstr = ' abcdefghjkmnopqrstuvwxyz23456789 ';
$fontcontent = substr ($rawstr, Rand (0,strlen ($RAWSTR)), 1);
Stitching is about to be born in the verification code $checkcode. = $fontcontent;
Avoid the resulting picture overlap $x + 20;
$y = rand (10,20); 
Imagestring ($image, $fontsize, $x, $y, $fontcontent, $fontcolor);
}//Save to Session variable $_session[' Checkcode ']= $checkcode; Generates some disturbing points, here are 200 for ($i =0 $i <200; $i + +) {$pointcolor = Imagecolorallocate ($image, Rand (50,255), Rand (50,255),
Rand (50,255));
Imagesetpixel ($image, Rand (0,100), Rand (0,30), $pointcolor); //Generate some noise lines here are 4 for ($i =0 $i <4; $i + +) {//set to light-colored line to prevent distracting $linecolor = ImagEcolorallocate ($image, Rand (50,255), Rand (50,255), Rand (50,255));
Imageline ($image, Rand (0,99), Rand (0,29), Rand (0,99), Rand (0,29), $linecolor);
Header (' content-type:image/png ');
Imagepng ($image); Releasing resources, destroying the execution object Imagedestroy ($image);

JavaScript Refresh Verification Code

<a href= "javascript:void (0);" onclick= "Change ()" > Unclear </a>
<script> function Change
() {
document.getElementById ("Imagecheckcode"). src = "./store.php?r=" + math.random (); 
}
</script>

Validate page

As the most core of this test is the replacement of the user's head, so the user name for the time being, whichever is the root.

Validation logic

<?php
session_start ();
Header ("Content-type:text/html;charset=utf-8");
$username = $_request[' username '];
$password = $_request[' password '];
if (Strtolower ($_request[' checkcode ']==$_session[' Checkcode ')) {
if (!is_dir ($username)) {
mkdir ($ username);
}
echo "Congratulations, landing success!" "." <br/>3 seconds will automatically jump to the personal homepage! ";
$_session[' username ' = $username;
Header ("refresh:3;url=./personalpage.php");
} else{
echo "Sorry, the landing failed!" ";
Header ("refresh:3;url=./index.php");
echo "<script>window.location.href= './index.php ' </script>"; 
}

Page Jump

In PHP, to first implement the page jump, there are many ways. This article uses a way to increase header information, and here are a few small instances of page jumps.

Header function

< PHP 
//Redirect Browser
header ("Location:http://blog.csdn.net/marksinoberg"); 
Ensure that after redirection, subsequent code will not be executed 
exit;
? >

Note: There should be no spaces between location and:

META tags

<meta http-equiv = "Refresh" 
content = "1;url=http://blog.csdn.net/marksinoberg" >

Note: Content can be controlled to complete the jump within a few seconds.

Javascript

< php 
$ url = "Http://bbs.lampbrother.net"; 
echo "< script language = ' javascript ' 
type = ' text/javascript ' > '; 
echo "window.location.href = ' $url '"; 
echo "</script >"; 
? >

Note: Using JavaScript, the location of the code can be arbitrary, as long as it meets the requirements of the grammar.

Upload page

Personal homepage

<! DOCTYPE HTML PUBLIC "-//W3C//DTD XHTML 1.0 transitional//en" "Http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd ">  

Upload Core

The core of the upload is a form, we upload the image uploaded to the server, and then PHP use Move_uploaded_file to achieve file migration, upload.

<?php
session_start ();
Header ("Content-type:text/html;charset=utf-8");
The storage location of the attachment, the name of the attachment
$path = "./root/";
$username = $_session[' username '];
The name that is spliced into the file on the server
$server _name = $path. $username. ". PNG ";
if ($_files[' photo '] [' Error ']>0 ') {
die ("Wrong!") ". $_files[' photo '] [' ERROR ']]; 
}
if (Move_uploaded_file ($_files[' photo '] [' tmp_name '], $server _name)) {
//echo "<BR>". " Upload success! ";
echo "Congratulations, upload success!" "." <br/>3 seconds will automatically jump to the personal homepage! "; 
Header ("refresh:3;url=./personalpage.php");
} else{
//echo "<BR>". Upload failed! ". $_files[' photo ' [' Error ']; 
echo "Sorry, upload avatar failed!" ";
Header ("refresh:2;url=./index.php");
>

Final results

Landing page

Validation results

Personal homepage

Latest Avatar

The above is a small set to introduce the implementation of PHP to change the Avatar function (for many users), I hope to help you, if you have any questions please give me a message, small series will promptly reply to everyone. Here also thank you very much for the cloud Habitat Community website support!