php 云标签的例子，代码如下：

<?php
/**
* @php 云标签
* @param $tags 标签列表
* @edit：www.
*/
function printTagCloud($tags) {
  // $tags is the array
  
  arsort($tags);
  
  $max_size = 32; // max font size in pixels
  $min_size = 12; // min font size in pixels
  
  // largest and smallest array values
  $max_qty = max(array_values($tags));
  $min_qty = min(array_values($tags));
  
  // find the range of values
  $spread = $max_qty - $min_qty;
  if ($spread == 0) { // we don't want to divide by zero
    $spread = 1;
  }
  
  // set the font-size increment
  $step = ($max_size - $min_size) / ($spread);
  
  // loop through the tag array
  foreach ($tags as $key => $value) {
    // calculate font-size
    // find the $value in excess of $min_qty
    // multiply by the font-size increment ($size)
    // and add the $min_size set above
    $size = round($min_size + (($value - $min_qty) * $step));
  
    echo '<a href="#"  . $size . 'px" title="' . $value . ' things tagged with ' . $key . '">' . $key . '</a> ';
  }
}

//调用示例
$tags = array('weddings' => 32, 'birthdays' => 41, 'landscapes' => 62, 'ham' => 51, 'chicken' => 23, 'food' => 91, 'turkey' => 47,
 'windows' => 82, 'apple' => 27);
printTagCloud($tags);
?>

1，form表单部分

<!-- Form Area -->
<form enctype="multipart/form-data" action="/blog_article/uploader.html" method="post"> 
Select Image: <input type="file" name="userfile"> 
<input type="submit" value="Upload!"> 
</form> 
<!-- Form Area -->

2，上传图片文件的php代码

<?php 

# Variables
$path = "images/";  
$max_size = "200000"; 

# File
$filename = $_POST['userfile']; 

# Control
if (!isset($HTTP_POST_FILES['userfile'])) exit; 

if (is_uploaded_file($HTTP_POST_FILES['userfile']['tmp_name'])) { 

if ($HTTP_POST_FILES['userfile']['size']>$max_size) {  
echo "文件太大，超过了上传文件的最大限制。The Max File Size is $max_size KB<br>n";  
exit;  
} 

# Type Control
if ( 
   ($HTTP_POST_FILES['userfile']['type']=="image/gif")   ||          
   ($HTTP_POST_FILES['userfile']['type']=="image/jpg")   ||   
   ($HTTP_POST_FILES['userfile']['type']=="image/bmp")   || 
   ($HTTP_POST_FILES['userfile']['type']=="image/png")   || 
   ($HTTP_POST_FILES['userfile']['type']=="image/jpeg") 
) 
{ 

# If File Exist
if (file_exists($path . $HTTP_POST_FILES['userfile']['name']))  
{  
echo "同名的文件已存在。<br>";  
exit;  
} 

$res = copy($HTTP_POST_FILES['userfile']['tmp_name'], $path . 

$HTTP_POST_FILES['userfile']['name']); 
if (!$res){  
echo "上传失败！<br>";  
exit;  
}  
else{  
echo "上传成功!<br>";  
} 

echo "File Name: ".$HTTP_POST_FILES['userfile']['name']."<br>"; 
echo "File Size: ".$HTTP_POST_FILES['userfile']['size']." bytes<br>"; 
echo "File Type: ".$HTTP_POST_FILES['userfile']['type']."<br>"; 
echo "<a href=/blog_article/$path/index.html".$HTTP_POST_FILES['userfile']['name'].">View Image</a>"; 
}  
else  
{ 
echo "错误的文件类型<br>";  
exit;  
} 
} 
?>

注意：
在php5以后的代码，已经不再使用这样的方式，改用全局变量$_FILE来接收上传数据了。

php获取meta站点信息的方法，代码如下：

<?php
/**
* @get_meta_tags函数的应用实例
* @获取站点描述信息
* @edit：www.
*
*/
// Header...
header("Content-Type: text/html; charset=utf-8");

// Function Starts Here...
function getInfo($URL){
  $getInfo= get_meta_tags($URL);
  return $getInfo;
}

// URL...
$URL = "http://www.";  

$_getInfo = getInfo($URL);
        
// Print.
echo "$URL <p>";
echo $_getInfo ["author"]."<p>";   
echo $_getInfo ["keywords"]."<p>";    
echo $_getInfo ["description"]."<p>"; 
echo $_getInfo ["robots"]."<p>";
?>