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php上传图片功能

2013-09-03 22:46 211 查看

首先我们来建立数据库：

CREATE TABLE `people` (
`id` INT NOT NULL AUTO_INCREMENT PRIMARY KEY ,
`fname` VARCHAR( 30 ) NOT NULL ,
`lname` VARCHAR( 40 ) NOT NULL ,
`filename` VARCHAR( 50 ) NOT NULL
) ENGINE = MYISAM ;

接下来我们建立数据库连接conn.php

<?php

// Input your information for the database here

// Host name
$host = "localhost";

// Database username
$username = "www.lelexie.com";

// Database password
$password = "www.lelexie.com";

// Name of database
$database = "db_name";

$conn = mysql_connect($host, $username, $password) or die ("Could not connect");
$db = mysql_select_db($database, $conn) or die ("Could not select DB");

?>

接下来建立index.php文件

<?php
// Start a session for displaying any form errors
session_start();
?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>Dream in code tutorial</title>

<style type="text/css">
label
{
float: left;
text-align: right;
margin-right: 10px;
width: 100px;
color: black;
}

#submit
{
float: left;
margin-top: 5px;
position: relative;
left: 110px;
}

#error
{
color: red;
font-weight: bold;
font-size: 16pt;
}
</style>
</head>

<body>

<div>
<?php
if (isset($_SESSION['error']))
{
echo "<span id=\"error\"><p>" . $_SESSION['error'] . "</p></span>";
unset($_SESSION['error']);
}
?>
<form action="upload.php" method="post" enctype="multipart/form-data">
<p>
<label>First Name</label>
<input type="text" name="fname" /><br />

<label>Last Name</label>
<input type="text" name="lname" /><br />

<label>Upload Image</label>
<input type="file" name="image" /><br />
<input type="hidden" name="MAX_FILE_SIZE" value="100000" />
<input type="submit" id="submit" value="Upload" />
</p>
</form>
<a href="http://www.lelexie.com">乐乐鞋</a>
</div>
</body>
</html>

建立upload.php

<?php
// Start a session for error reporting
session_start();

// Call our connection file
require("includes/conn.php");

// Check to see if the type of file uploaded is a valid image type
function is_valid_type($file)
{
// This is an array that holds all the valid image MIME types
$valid_types = array("image/jpg", "image/jpeg", "image/bmp", "image/gif");

if (in_array($file['type'], $valid_types))
return 1;
return 0;
}

// Just a short function that prints out the contents of an array in a manner that's easy to read
// I used this function during debugging but it serves no purpose at run time for this example
function showContents($array)
{
echo "<pre>";
print_r($array);
echo "</pre>";
}

// Set some constants

// This variable is the path to the image folder where all the images are going to be stored
// Note that there is a trailing forward slash
$TARGET_PATH = "images/";

// Get our POSTed variables
$fname = $_POST['fname'];
$lname = $_POST['lname'];
$image = $_FILES['image'];

// Sanitize our inputs
$fname = mysql_real_escape_string($fname);
$lname = mysql_real_escape_string($lname);
$image['name'] = mysql_real_escape_string($image['name']);

// Build our target path full string.  This is where the file will be moved do
// i.e.  images/picture.jpg
$TARGET_PATH .= $image['name'];

// Make sure all the fields from the form have inputs
if ( $fname == "" || $lname == "" || $image['name'] == "" )
{
$_SESSION['error'] = "All fields are required";
header("Location: index.php");
exit;
}

// Check to make sure that our file is actually an image
// You check the file type instead of the extension because the extension can easily be faked
if (!is_valid_type($image))
{
$_SESSION['error'] = "You must upload a jpeg, gif, or bmp";
header("Location: index.php");
exit;
}

// Here we check to see if a file with that name already exists
// You could get past filename problems by appending a timestamp to the filename and then continuing
if (file_exists($TARGET_PATH))
{
$_SESSION['error'] = "A file with that name already exists";
header("Location: index.php");
exit;
}

// Lets attempt to move the file from its temporary directory to its new home
if (move_uploaded_file($image['tmp_name'], $TARGET_PATH))
{
// NOTE: This is where a lot of people make mistakes.
// We are *not* putting the image into the database; we are putting a reference to the file's location on the server
$sql = "insert into people (fname, lname, filename) values ('$fname', '$lname', '" . $image['name'] . "')";
$result = mysql_query($sql) or die ("Could not insert data into DB: " . mysql_error());
header("Location: images.php");
exit;
}
else
{
// A common cause of file moving failures is because of bad permissions on the directory attempting to be written to
// Make sure you chmod the directory to be writeable
$_SESSION['error'] = "Could not upload file.  Check read/write persmissions on the directory";
header("Location: index.php");
exit;
}
?>

建立image.php<?php
// Get our database connector
require("includes/conn.php");
?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>Dream in code tutorial - List of Images</title>
</head>

<body>

<div>

<?php
// Grab the data from our people table
$sql = "select * from people";
$result = mysql_query($sql) or die ("Could not access DB: " . mysql_error());

while ($row = mysql_fetch_assoc($result))
{
echo "<div class=\"picture\">";
echo "<p>";

// Note that we are building our src string using the filename from the database
echo "<img src=\"images/" . $row['filename'] . "\" alt=\"\" /><br />";
echo $row['fname'] . " " . $row['lname'] . "<br />";
echo "</p>";
echo "</div>";
}

?>

</div>
</body>
</html>

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