1.打印数组函数

 
function _print($array) 
{ 
echo ("<pre>"); 
print_r($array); 
echo ("</pre>"); 
} 

2.截取字串

 
func_chgtitle 
function func_chgtitle($str,$len) 
{ 
if(strlen($str)>$len) 
{ 
$tmpstr = ""; 
$strlen = $len; 
for($i = 0; $i < $strlen; $i++) 
{ 
if(ord(substr($str, $i, 1)) > 0xa0) 
{ 
$tmpstr .= substr($str, $i, 2); 
$i++; 
} 
else 
$tmpstr .= substr($str, $i, 1); 
} 
return $tmpstr.""; 
} 
else 
{ 
return $str; 
} 
} 

3.加载文件

 
loadFile 
function loadFile($filepath) 
{ 
$filecontent = ""; 
$fptr = fopen($filepath,"r"); 
if ($fptr) 
{ 
while ($content = fgets($fptr,4096)) 
{ 
$filecontent .= $content; 
} 
fclose($fptr); 
} 
return $filecontent; 
} 

4.下载文件
downloadFile

 
function downloadFile($path,$fileInfo) 
{ 
$target_file = $path.$fileInfo['fileid']; 
$file_content = loadFile($target_file); 
header("Content-Disposition: attachment; filename=".$fileInfo['filename']); 
header("Content-type: ".$fileInfo['filetype']); 
header("Content-Length: ".$fileInfo['filesize']); 
echo $file_content; 
} 

5.数组排序

 
/** 
* @package BugFree 
* @version $Id: FunctionsMain.inc.php,v 1.32 2005/09/24 11:38:37 wwccss Exp $ 
* 
* 
* Sort an two-dimension array by some level two items use array_multisort() function. 
* 
* sysSortArray($Array,"Key1","SORT_ASC","SORT_RETULAR","Key2"……) 
* @author Chunsheng Wang <wwccss@263.net> 
* @param array $ArrayData the array to sort. 
* @param string $KeyName1 the first item to sort by. 
* @param string $SortOrder1 the order to sort by("SORT_ASC"|"SORT_DESC") 
* @param string $SortType1 the sort type("SORT_REGULAR"|"SORT_NUMERIC"|"SORT_STRING") 
* @return array sorted array. 
*/ 
function sysSortArray($ArrayData,$KeyName1,$SortOrder1 = "SORT_ASC",$SortType1 = "SORT_REGULAR") 
{ 
if(!is_array($ArrayData)) 
{ 
return $ArrayData; 
} 
// Get args number. 
$ArgCount = func_num_args(); 
// Get keys to sort by and put them to SortRule array. 
for($I = 1;$I < $ArgCount;$I ++) 
{ 
$Arg = func_get_arg($I); 
if(!eregi("SORT",$Arg)) 
{ 
$KeyNameList[] = $Arg; 
$SortRule[] = '$'.$Arg; 
} 
else 
{ 
$SortRule[] = $Arg; 
} 
} 
// Get the values according to the keys and put them to array. 
foreach($ArrayData AS $Key => $Info) 
{ 
foreach($KeyNameList AS $KeyName) 
{ 
${$KeyName}[$Key] = $Info[$KeyName]; 
} 
} 
// Create the eval string and eval it. 
if(count($ArrayData)>0) 
{ 
$EvalString = 'array_multisort('.join(",",$SortRule).',$ArrayData);'; 
eval ($EvalString); 
} 
return $ArrayData; 
} 

来源：http://www.cnblogs.com/xiaosuo/archive/2009/12/14/1594455.html