如何從數組中獲得唯一值？

Question

$a=array("a"=>"Cat","b"=>"Dog","c"=>"Cat"); 

從上述陣列我需要單獨的值的狗。我怎麼能從數組中獲得唯一的值？有沒有在PHP的任何功能...

感謝 拉維

Answer 1

$a = array("a"=>"Cat","b"=>"Dog","c"=>"Cat"); 
$counted = array_count_values($a); 
$result = array(); 
foreach($counted as $key => $value) { 
    if($value === 1) { 
    $result[] = $key; 
    } 
} 
//$result is now an array of only the unique values of $a 
print_r($result); 

Answer 2

$a=array("a"=>"Cat","b"=>"Dog","c"=>"Cat"); 
$result = array_unique(a); 
print_r($result); 

試試這個...

Answer 3

看一看：

http://php.net/function.array-unique

，也許：

http://php.net/function.array-count-values

Answer 4

function getArrayItemByValue($search, $array) { 
    // without any validation and cheking, plain and simple 
    foreach($array as $key => $value) { 
     if($search === $value) { 
      return $key; 
     } 
    } 

    return false; 
} 

然後嘗試使用它：

echo $a[getArrayitembyValue('Dog', $a)]; 

Answer 5

嘗試用：

$a = array("a"=>"Cat","b"=>"Dog","c"=>"Cat"); 
$aFlip = array_flip($a); 
$unique = array(); 

foreach (array_count_values($a) as $key => $count) { 
    if ($count > 1) continue; 
    // $unique[ array_search($key) ] = $key; 
    $unique[ $aFlip[$key] ] = $key; 
} 

Answer 6

使用下面的函數似乎是工作&得心應手。

<?php 
$array1 = array('foo', 'bar', 'xyzzy', 'xyzzy', 'xyzzy'); 

$dup = array_unique(array_diff_assoc($array1, array_unique($array1))); 

$result = array_diff($array1, $dup); 

print_r($result); 
?> 

你可以看到它在這裏工作 - http://codepad.org/Uu21y6jf