11. PHP强制性文件下载
为用户提供强制性的文件下载功能。
/********************
*@file – path to file
*/
function force_download($file)
{
if ((isset($file))&&(file_exists($file))) {
header(“Content-length: “.filesize($file));
header(‘Content-Type: application/octet-stream’);
header(‘Content-Disposition: attachment; filename=”‘ . $file . ‘”‘);
readfile(“$file”);
} else {
echo “No file selected”;
}
}12. PHP创建标签云
function getCloud( $data = array(), $minFontSize = 12, $maxFontSize = 30
)
{
$minimumCount = min( array_values( $data ) );
$maximumCount = max(
array_values( $data ) );
$spread = $maximumCount –
$minimumCount;
$cloudHTML = ”;
$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” />’;
}
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