Array
$_COOKIE
-Contains keys and values set as browser cookies
$_ENV
-Contains keys and values set by the script's shell context
$_FILES
-Contains information about uploaded files
$_GET
-Contains keys and values submitted to the script using the HTTP get method
$_POST
-Contains keys and values submitted to the script using the HTTP post method
$_REQUEST
-A combined array containing values from the $_GET, $_POST, and $_COOKIES superglobal arrays
$_SERVER
-Variables made available by the server
$GLOBALS
-Contains all global variables associated with the current script
2. An example for $_SERVER
<?php
foreach ( $_SERVER as $key=>$value ) {
print "\$_SERVER[\"$key\"] == $value<br/>";
}
?>
3. $_SERVER Variables
$_SERVER['PHP_SELF']
-contains the current script. Suitable for use in links and form element action arguments.
$_SERVER['HTTP_USER_AGENT']
-contains the name and version of the client.
$_SERVER['REMOTE_ADDR']
-contains the IP address of the client.
$_SERVER['REQUEST_METHOD']
-contains whether the request was GET or POST.
$_SERVER['QUERY_STRING']
-contains for GET requests, the encoded data sent appended to the URL.
$_SERVER['REQUEST_URI']
-contains the full address of the request, including query string.
$_SERVER['HTTP_REFERER']
-contains the address of the page from which the request was made.
4. Sending the data
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html>
<head>
<title>A Simple HTML Form</title>
</head>
<body>
<form action=“process.php" method="get">
<input type="text" name="user"/>
<textarea name="address" rows="5" cols="40"> </textarea>
<input type="submit" value="hit it!" />
</form>
</body>
</html>
5. Capturing the data
<?php print "Welcome <b>".$_GET['user']."</b><br/>\n\n";
print "Your address is: <br/><b>".$_GET['address']."</b>";
?>
6. Sending array of data
<form action="process.php" method="post">
<input type="text" name="user" />
<input name="address" type="text" value="
" size="40" />
<select name="products[]" multiple="multiple">
<option>Sonic Screwdriver</option>
<option>Tricorder</option>
<option>ORAC AI</option>
<option>HAL 2000</option>
</select>
<input type="submit" value="hit it!" />
</form>
7. Capturing array of data
<?php
print "Welcome <b>".$_POST['user']."</b><br/>\n";
print "Your address is:<br/><b>".$_POST['address']."</b><br/>\n";
if ( is_array( $_POST['products'] ) ) {
print "<p>Your product choices are:</p>\n";
print "<ul>\n";
foreach ( $_POST['products'] as $value ) {
print "<li>$value</li>\n";
}
print "</ul>\n";
}
?>
8. PHP that calls itself
<?php
if ( ! empty( $_POST['guess'] ) ) {
print "last guess: ".$_POST['guess'];
}
?>
<form method="post" action="<?php print $_SERVER['PHP_SELF']?>">
<p>
Type your guess here: <input type="text" name="guess" />
</p>
</form>
9. Using Hidden Fields
<form method="post" action="<?php print $_SERVER['PHP_SELF']?>">
<input type="hidden" name="num_tries" value="<?php print $num_tries?>" />
Type your guess here: <input type="text" name="guess" value= "<?php print $guess?>"/>
</form>
10. Redirecting Pages
header("Location:congrats.html");
11. File Upload Form
form enctype="multipart/form-data" action="<?print $_SERVER['PHP_SELF']?>" method="post">
<input type="hidden" name="MAX_FILE_SIZE" value="102400" />
<input type="file" name="fupload" />
<input type="submit" value="upload!" />
</form>
12. $_FILES Elements
$ FILES['fupload']['name']
-contains name of uploaded file
$_FILES['fupload']['tmp_name']
-contains path to temporary file
$_FILES['fupload']['size']
-contains the size (in bytes) of uploaded file
$_FILES['fupload']['error']
-contains an error code corresponding to a PHP constant
$_FILES['fupload']['type']
-contains MIME type of uploaded file (where given by client)
13. File upload example
<?php if ( isset( $_FILES['fupload'] ) )
{
print "name: ". $_FILES['fupload']['name'] ."<br />";
print "size: ". $_FILES['fupload']['size'] ." bytes<br />";
print "temp name: ".$_FILES['fupload']['tmp_name'] ."<br />";
print "type: ". $_FILES['fupload']['type'] ."<br />";
print "error: ". $_FILES['fupload']['error'] ."<br />";
if ( $_FILES['fupload']['type'] == "image/gif" ) {
$source = $_FILES['fupload']['tmp_name'];
$target = "upload/".$_FILES['fupload']['name'];
move_uploaded_file( $source, $target );// or die ("Couldn't copy");
$size = getImageSize( $target );
$imgstr = "<p><img width=\"$size[0]\" height=\"$size[1]\" ";
$imgstr .= "src=\"$target\" alt=\"uploaded image\" /></p>";
print $imgstr;
} } ?>
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