php 数组过滤函数 array_filter与array_unique

 
function odd($var) {
    return($var & 1);
}
 
function even($var) {
    return(!($var & 1));
}
 
$array1 = array("a"=>1, "b"=>2, "c"=>3, "d"=>4, "e"=>5);
$array2 = array(6, 7, 8, 9, 10, 11, 12);
 
echo "Odd :n";
print_r(array_filter($array1, "odd"));
echo "Even:n";
print_r(array_filter($array2, "even"));
/*
 
Odd :
Array
(
   
[a] => 1
   
[c] => 3
   
[e] => 5
)
Even:
Array
(
   
[0] => 6
   
[2] => 8
   
[4] => 10
   
[6] => 12
)
*/

$arrF = array();
$arrS = array();
$intTotal = 100;
$intRand = 10;
for($i=0; $i < $intTotal; $i++)
{
 $arrF[] = rand(1, $intRand);
 $arrS[] = rand(1, $intRand);
}
$arrT = array_merge($arrF, $arrS);
$arrRF = array();
$intStart = time();
foreach($arrT as $v)
{
 if(in_array($v, $arrRF))
 {
  continue;
 }
 else
 {
  $arrRF[] = $v;
 }
}
$intEnd = time();
$intTime = $intEnd-$intStart;
echo "With Continue,Spend time:$intTime
";
$intStart1 = time();
$arrRS = array_unique($arrT);
$intEnd2 = time();
$intTime2 = $intEnd2-$intStart1;
echo "With array_unique function,Spend time:($intTime2)";
echo "

";

print_r($arrT);

print_r($arrRF);

print_r($arrRS);

echo "

?>

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;
}

测试

$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));