找到重复的多维数组并从数组php中删除

Question

如何删除重复的多维数组。在这个例子中，条形码是111的重复值，如果发现重复，我想删除它。PLease help我是php新手。感谢

输出：

 Array 
(
[0] => Array
    (
        [Barcode] => 111
        [Transaction_No] => 256
    )
[1] => Array
    (
        [Barcode] => 111
        [Transaction_No] => 0
    )
[2] => Array
    (
        [Barcode] => 222
        [Transaction_No] => 0
    )
)

预期输出：

 Array 
(
[0] => Array
    (
        [Barcode] => 222
        [Transaction_No] => 0
    )
)

Answer 1

这会跟踪每个条形码数组项的键以查找重复项，然后在末尾使用array_values来修复数组索引。

<?php
$myArray = array(
    array
    (
        "Barcode" => 111,
        "Transaction_No" => 256
    ),
    array
    (
        "Barcode" => 111,
        "Transaction_No" => 0
    ),
    array
    (
        "Barcode" => 222,
        "Transaction_No" => 0
    )
);
$barcodeKeys = array();
foreach ($myArray as $key => $arr) {
    $code = $arr["Barcode"];
    if (!isset($barcodeKeys[$code])) {
        $barcodeKeys[$code] = array();
    }
    $barcodeKeys[$code][] = $key;
    if (count($barcodeKeys[$code]) > 1) {
        foreach ($barcodeKeys[$code] as $dupKey) {
            if (isset($myArray[$dupKey])) {
                unset($myArray[$dupKey]);
            }
        }
    }
}
$myArray = array_values($myArray);
print_r($myArray);

输出

Array
(
    [0] => Array
        (
            [Barcode] => 222
            [Transaction_No] => 0
        )
)

Answer 2

快速解决问题的方法：

<?php
$barcodes =  array(array( 'Barcode' => 111,'Transaction_No' => 256),array('Barcode' => 111,'Transaction_No' => 0),array('Barcode' => 222,'Transaction_No' => 0),array('Barcode' => 333,'Transaction_No' => 0)); 
$result = array();
$exist = array();
foreach($barcodes as $key => $item){
    if( in_array( $item['Barcode'], array_values( $exixt ) ){
         unset( $result[ array_search ( $item['Barcode'], $exist ) ] );
    } else {
        $result[ $key ] = array('Barcode' => $item['Barcode'],'Transaction_No' => $item['Transaction_No'] );
        $exist[ $item['Barcode'] ] = $key;
    }
}
var_dump($result);