php对二维数组进行相关操作（排序、转换、去空白等）

array_keys($array) //返回所有键名  array_values($array) //返回所有键值   $result=array_reverse($input); //将数组颠倒，不保留键名 $result_keyed=array_reverse($input,true); //将数组颠倒，保留键名  array_keys($array,"blue"); //返回值为blue的键名  

function unique_arr($array2D,$stkeep=false,$ndformat=true) {   // 判断是否保留一级数组键 (一级数组键可以为非数字)   if($stkeep) $stArr = array_keys($array2D);    // 判断是否保留二级数组键 (所有二级数组键必须相同)   if($ndformat) $ndArr = array_keys(end($array2D));    //降维,也可以用implode,将一维数组转换为用逗号连接的字符串   foreach ($array2D as $v){     $v = join(",",$v);      $temp[] = $v;   }    //去掉重复的字符串,也就是重复的一维数组   $temp = array_unique($temp);     //再将拆开的数组重新组装   foreach ($temp as $k => $v)   {     if($stkeep) $k = $stArr[$k];     if($ndformat)     {       $tempArr = explode(",",$v);        foreach($tempArr as $ndkey => $ndval) $output[$k][$ndArr[$ndkey]] = $ndval;     }     else $output[$k] = explode(",",$v);    }    return $output; }  

$array2D = array('first'=>array('title'=>'1111','date'=>'2222'),'second'=>array('title'=>'1111','date'=>'2222'),'third'=>array('title'=>'2222','date'=>'3333'));   print_r($array2D); print_r(unique_arr($array2D,true)); 

function printr($arr) {   echo '<pre>';    print_r($arr);   echo '</pre><br>'; } 

$a = array('a'=>1,2);  sort($a); printr($a);  rsort($a); printr($a);  /*Array (   [0] => 1   [1] => 2 )  Array (   [0] => 2   [1] => 1 ) */ 

$a = array('a'=>1,2); asort($a); printr($a);   arsort($a); printr($a);  /* Array (   [a] => 1   [0] => 2 )  Array (   [0] => 2   [a] => 1 ) */ 

$a = array('a'=>1,2);  ksort($a); printr($a);   krsort($a); printr($a);  /* Array (   [0] => 2   [a] => 1 )  Array (   [a] => 1   [0] => 2 ) */ 

/**  * @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.  *  * sortArr($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 $SortType1  the sort type("SORT_REGULAR"|"SORT_NUMERIC"|"SORT_STRING")  * @return array        sorted array.  */ function sortArr($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}[$Key] = strtolower($Info[$KeyName]);   }      // Create the eval string and eval it.   $EvalString = 'array_multisort('.join(",",$SortRule).',$ArrayData);';   eval ($EvalString);   return $ArrayData; } 

//################# 示例 ################# $arr = array(  array(    'name'    =>  '学习',    'size'    =>  '1235',    'type'    =>  'jpe',    'time'    =>  '1921-11-13',    'class'    =>  'dd',  ),  array(    'name'    =>  '中国功夫',    'size'    =>  '153',    'type'    =>  'jpe',    'time'    =>  '2005-11-13',    'class'    =>  'jj',  ),  array(    'name'    =>  '编程',    'size'    =>  '35',    'type'    =>  'gif',    'time'    =>  '1997-11-13',    'class'    =>  'dd',  ),  array(    'name'    =>  '中国功夫',    'size'    =>  '65',    'type'    =>  'jpe',    'time'    =>  '1925-02-13',    'class'    =>  'yy',  ),  array(    'name'    =>  '中国功夫',    'size'    =>  '5',    'type'    =>  'icon',    'time'    =>  '1967-12-13',    'class'    =>  'rr',  ), );  echo '<pre>'; print_r($arr); echo '<br>';  //注意：按照数字方式排序时 153 比 65 小 $temp = sortArr($arr,"name","SORT_ASC","type","SORT_DESC","size","SORT_ASC","SORT_STRING");  print_r($temp);  echo '</pre>'; 

function rebuild_array($arr){ //rebuild a array  static $tmp=array();   for($i=0; $i<count($arr); $i++){   if(is_array($arr[$i])){     rebuild_array($arr[$i]);   }else{     $tmp[]=$arr[$i];   }  }   return $tmp; } 

$arr=array('123.html','456.html',array('dw.html','fl.html',array('ps.html','fw.html')),'ab.html');  // 定义一个三维数组，用来检测我们的函数 echo '<pre>'; print_r(rebuild_array($arr)); echo '</pre>'; 

function array_remove_empty(&$arr, $trim = true)   {     foreach ($arr as $key => $value) {       if (is_array($value)) {         array_remove_empty($arr[$key]);       } else {         $value = trim($value);         if ($value == '') {           unset($arr[$key]);         } elseif ($trim) {           $arr[$key] = $value;         }      }     }   }  

$a = array(array(3),2,'',array('',23),0);  array_remove_empty($a);  printr($a); // printr 函数请在本文中找 

function getall_by_key(array $arr, $key){   if (!trim($key)) return false;   preg_match_all("//"$key/";/w{1}:(?:/d+:|)(.*?);/", serialize($arr), $output);   return $output[1]; }  $testArr = array('111'=> 100, 'out'=> 200, '333' => array('out' => 310, array(321, 322, 'out' => "this is a test")));  printr(getall_by_key($testArr, 'out'));