php字符串截取函数（支持中文 utf-8截取）

function str_wrap1($str,$elen=30)
{
    $tlen = mb_strlen($str,"utf8"); //共有多少字
    //$elen = 8; //每行字符串长度8个字符、4个汉字
    $dlen = 0; //每行显示长度
    $str_wrap = '';
    for($i=0;$i<$tlen;$i++)
    {
        $tmpchar = mb_substr($str,$i,1,"utf8");
        if(strlen($tmpchar) == 3)
            $charlen = 2;
        else
            $charlen = 1;
        if( $dlen < $elen-1 )
        {
            $dlen += $charlen;
            $str_wrap .= $tmpchar;
        }
        else
        {
            $str_wrap .= "<br>".$tmpchar;
            $dlen = $charlen;
        }
    }
    return $str_wrap;
}

echo str_wrap1($str,5);

function multi_array_sort($multi_array,$sort_key,$sort=sort_asc){  
    if(is_array($multi_array)){  
        foreach ($multi_array as $row_array){  
            if(is_array($row_array)){  
                $key_array[] = $row_array[$sort_key];  
            }else{  
                return -1;  
            }  
        }  
    }else{  
        return -1;  
    }  
    array_multisort($key_array,$sort,$multi_array);  
    return $multi_array;  
} 

bool array_multisort ( array $ar1 [, mixed $arg [, mixed $... [, array $... ]]] )

<?php
//以时间inputdate为key值进行二维数组降序排列
function array_sort($arr,$keys,$type){
$keysvalue=array();
$i = 0;
foreach($arr as $key=>$val) {
$val[$keys] = str_replace("-","",$val[$keys]);
$val[$keys] = str_replace(" ","",$val[$keys]);
$val[$keys] = str_replace(":","",$val[$keys]);
$keysvalue[] =$val[$keys];

}
asort($keysvalue); //key值排序
reset($keysvalue); //指针重新指向数组第一个
foreach($keysvalue as $key=>$vals) {
$keysort[] = $key;
}
$new_array = array();
if($type != "asc"){
for($ii=count($keysort)-1; $ii>=0; $ii--) {
$new_array[] = $arr[$keysort[$ii]];
}
}else{
for($ii=0; $ii<count($keysort); $ii++){
$new_array[] = $arr[$keysort[$ii]];
}
}
return $new_array;
}
?>

<?php
    $a = array(
       0=>array("id"=>1,"name"=>"小何","addr"=>"0:1"),
       1=>array("id"=>2,"name"=>"小刚","addr"=>"0:1:2"),
       2=>array("id"=>3,"name"=>"小军","addr"=>"0:1:3"),
       3=>array("id"=>4,"name"=>"公司","addr"=>"0:4"),
    );
function sort_by($array, $keyname = null, $sortby){
    $myarray = $inarray = array();
    foreach($array as $i=>$befree){
      $myarray[$i] = $array[$i][$keyname];
    }
    switch($sortby){
       case 'asc':
       asort($myarray);
       break;
       case 'arsort':
       arsort($myarray);
       break;
       case 'natcasesor':
       natcasesor($myarray);
       break;
    }
    foreach($myarray as $key=>$befree){
        $inarray[$key] = $array[$key];
        }
          return $inarray;
}
print_r(sort_by($a,"addr","arsort"));

print_r($a[2]["id"]);
?>

$site=substr($url,0,strpos($url,"/",8));//站点

$base=substr($url,0,strrpos($url,"/")+1);//文件所在目录

$fp = fopen($url, "r" );//打开url

while(!feof($fp))$contents.=fread($fp,1024);//

$pattern="|href=['"]?([^ '"]+)['" ]|u";

preg_match_all($pattern,$contents, $regarr, preg_set_order);//匹配所有href=

for($i=0;$i<count($regarr);$i++){//遍历所有匹配

if(!eregi("://",$regarr[$i][1]))//是否是相对路径，即是否还有://

if(substr($regarr[$i][1],0,1)=="/")//是否是站点的根目录

   echo "link".($i+1).":".$site.$regarr[$i][1]."<br/>";//根目录

else

   echo "link".($i+1).":".$base.$regarr[$i][1]."<br/>";//当前目录

else

echo "link".($i+1).":".$regarr[$i][1]."<br/>";//相对路径

}

fclose($fp);