删除多维数组中的重复项并保留原始数组键值

Question

我有这个数组

Array (
    [0] => Array ( [name] => Apple [amount] => 1)
    [1] => Array ( [name] => Apple [amount] => 2)
    [2] => Array ( [name] => Orange [amount] => 3)
    [3] => Array ( [name] => Orange [amount] => 4)
    [4] => Array ( [name] => Banana [amount] => 5)
    [5] => Array ( [name] => Pear [amount] => 6)
)

我想这样结束：

Array (
    [0] => Array ( [name] => Apple [amount] => 1)
    [2] => Array ( [name] => Orange [amount] => 3)
    [4] => Array ( [name] => Banana [amount] => 5)
    [5] => Array ( [name] => Pear [amount] => 6)
)

重要的是转换后的数组键值必须相同。

目前我使用这个解决方案：

$newArray = array();
$usedFruits = array();

foreach ( $originalArray AS $line ) {
    if ( !in_array($line['name'], $usedFruits) ) {
        $usedFruits[] = $line['name'];
        $newArray[] = $line;
    }
}

$originalArray = $newArray;
$newArray = NULL;
$usedFruits = NULL;

这会删除重复的数组，但也会重置键值。

Array ( 
    [0] => Array ( [name] => Apple [amount] => 1)
    [1] => Array ( [name] => Orange [amount] => 3)
    [2] => Array ( [name] => Banana [amount] => 5)
    [3] => Array ( [name] => Pear [amount] => 6)
)

如何保留原始数组键值？

Answer 1

使用可选$key的foreach()：

foreach ( $originalArray AS $key => $line ) { 
    if ( !in_array($line['name'], $usedFruits) ) { 
        $usedFruits[] = $line['name']; 
        $newArray[$key] = $line; 
    } 
} 

http://codepad.org/SuClGlQW

输出：

Array
(
    [0] => Array
        (
            [name] => Apple
            [amount] => 1
        )

    [2] => Array
        (
            [name] => Orange
            [amount] => 3
        )

    [4] => Array
        (
            [name] => Banana
            [amount] => 5
        )

    [5] => Array
        (
            [name] => Pear
            [amount] => 6
        )

)