再来二十一段救命的PHP代码(5)

$cloudTags = array(); 

$spread == 0 && $spread = 1; 

foreach( $data as $tag => $count )

{

$size = $minFontSize + ( $count - $minimumCount )

* ( $maxFontSize - $minFontSize ) / $spread;

$cloudTags[] = '<a style="font-size: ' . floor( $size ) . 'px'

. '" href="#" title="\'' . $tag .

'\' returned a count of ' . $count . '">'

. htmlspecialchars( stripslashes( $tag ) ) . '</a>';

} 

return join( "\n", $cloudTags ) . "\n";

}

/**************************

**** Sample usage ***/

$arr = Array('Actionscript' => 35, 'Adobe' => 22, 'Array' => 44, 'Background' => 43,

'Blur' => 18, 'Canvas' => 33, 'Class' => 15, 'Color Palette' => 11, 'Crop' => 42,

'Delimiter' => 13, 'Depth' => 34, 'Design' => 8, 'Encode' => 12, 'Encryption' => 30,

'Extract' => 28, 'Filters' => 42);

echo getCloud($arr, 12, 36); 13. PHP寻找两个字符串的相似性

PHP 提供了一个极少使用的similar_text 函数，但此函数非常有用，用于比较两个字符串并返回相似程度的百分比。

 similar_text($string1, $string2, $percent);

//$percent will have the percentage of similarity 14. PHP在应用程序中使用Gravatar 通用头像

随着WordPress 越来越普及，Gravatar 也随之流行。由于Gravatar 提供了易于使用的API，将其纳入应用程序也变得十分方便。

 /******************

*@email - Email address to show gravatar for

*@size - size of gravatar

*@default - URL of default gravatar to use

*@rating - rating of Gravatar(G, PG, R, X)

*/

function show_gravatar($email, $size, $default, $rating)

{

echo '<img src="http://www.gravatar.com/avatar.php?gravatar_id='.md5($email).

'&default='.$default.'&size='.$size.'&rating='.$rating.'" width="'.$size.'px"

height="'.$size.'px" />';

} 15. PHP在字符断点处截断文字

所谓断字(word break)，即一个单词可在转行时断开的地方。这一函数将在断字处截断字符串。

16. PHP文件Zip 压缩

 /* creates a compressed zip file */

function create_zip($files = array(),$destination = '',$overwrite = false) {

//if the zip file already exists and overwrite is false, return false

if(file_exists($destination) && !$overwrite) { return false; }

//vars

$valid_files = array();

//if files were passed in...

if(is_array($files)) {

//cycle through each file

foreach($files as $file) {

//make sure the file exists