15. PHPÔÚ×Ö·û¶Ïµã´¦½Ø¶ÏÎÄ×Ö

Ëùν¶Ï×Ö (word break)£¬¼´Ò»¸öµ¥´Ê¿ÉÔÚתÐÐʱ¶Ï¿ªµÄµØ·½¡£ÕâÒ»º¯Êý½«ÔÚ¶Ï×Ö´¦½Ø¶Ï×Ö·û´®¡£

// Original PHP code by Chirp Internet: www.chirp.com.au
// Please acknowledge use of this code by including this header.
function myTruncate($string, $limit, $break=¡±.¡±, $pad=¡±¡­¡±) {
// return with no change if string is shorter than $limit
if(strlen($string) <= $limit)
return $string;

// is $break present between $limit and the end of the string?
if(false !== ($breakpoint = strpos($string, $break, $limit))) {
if($breakpoint < strlen($string) ¨C 1) {
$string = substr($string, 0, $breakpoint) . $pad;
}
}
return $string;
}
/***** Example ****/
$short_string=myTruncate($long_string, 100, ¡® ¡®);

16. PHPÎļþ Zip ѹËõ

/* 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 $file) {
//make sure the file exists
if(file_exists($file)) {
$valid_files[] = $file;
}
}
}
//if we have good files¡­
if(count($valid_files)) {
//create the archive
$zip = new ZipArchive();
if($zip->open($destination,$overwrite ? ZIPARCHIVE::OVERWRITE : ZIPARCHIVE::CREATE) !== true) {
return false;
}
//add the files
foreach($valid_files as $file) {
$zip->addFile($file,$file);
}
//debug
//echo ¡®The zip archive contains ¡®,$zip->numFiles,¡¯ files with a status of ¡®,$zip->status;

//close the zip ¡ª done!
$zip->close();

//check to make sure the file exists
return file_exists($destination);
}
else
{
return false;
}
}
/***** Example Usage ***/
$files=array(¡®file1.jpg¡¯, ¡®file2.jpg¡¯, ¡®file3.gif¡¯);
create_zip($files, ¡®myzipfile.zip¡¯, true);