Question

我有一个数组如下

array(
  0 => array('email' => 'abc@abc.com','name'=>'abc'),
  1 => array('email' => 'xyz@abc.com','name'=>'xyz'),
  2 => array('email' => 'uvw@abc.com','name'=>'uvw'),
  3 => array('email' => 'abc@abc.com','name'=>'str'),
 )

我想过滤掉电子邮件地址上的记录，并获取具有相同电子邮件地址的记录。例如，从上面的例子我想要

 array(
  0 => array(
     array(
         0 => array('email' => 'abc@abc.com','name'=>'abc'),
         1 => array('email' => 'abc@abc.com','name'=>'str'),
     )
 )

我的代码是

 $tmpArray = array();
    $duplicateRecords = array();
    if (empty($data)) {
        return false;
    }

    foreach ($data as $key => $value) {

        if (in_array($value['Email'], $tmpArray)) {
            $duplicateRecords[] = $value;
        }
        $tmpArray[] = $value['Email'];
    }

    echo '<pre>';print_r($duplicateRecords);die;

但是这段代码只返回记录一次存在，这是第二次。我知道什么时候它第一次遍历它没有电子邮件进行比较。有没有办法让记录的存在次数和数组一样多。

Answer 1

// get count of each email
$counters = array_count_values(array_column($data, 'email'));

// collect email with counter > 1
$result = [];
foreach ($data as $item) {
    if ($counters[$item['email']] > 1) {
        $result[] = $item;
    }
}

Answer 2

这个应该适合你：

foreach($array as $key => $value) {
    foreach ($array as $k => $v) {
        if ($key < $k && $value['email'] == $v['email']) {
            $result[] = array(
                $value,
                $v
            );
        }
    }
}

PHPFiddle链接：http://phpfiddle.org/main/code/8trq-k2zc

请注意：这只会找到冲突对。例如：

$array = array(
    array(
        'email' => 'abc@abc.com',
        'name' => 'abc'
    ),
    array(
        'email' => 'abc@abc.com',
        'name' => 'def'
    ),
    array(
        'email' => 'abc@abc.com',
        'name' => 'ghi'
    )
);

会导致：

Array
(
    [0] => Array
        (
            [0] => Array
                (
                    [email] => abc@abc.com
                    [name] => abc
                )

            [1] => Array
                (
                    [email] => abc@abc.com
                    [name] => def
                )

        )

    [1] => Array
        (
            [0] => Array
                (
                    [email] => abc@abc.com
                    [name] => abc
                )

            [1] => Array
                (
                    [email] => abc@abc.com
                    [name] => ghi
                )

        )

    [2] => Array
        (
            [0] => Array
                (
                    [email] => abc@abc.com
                    [name] => def
                )

            [1] => Array
                (
                    [email] => abc@abc.com
                    [name] => ghi
                )

        )

)

所以abc与def冲突，abc与ghi冲突，def与ghi冲突。

Answer 3

这是一个两通＃＆＃39;解。代码已注释。

PHP 5.3.18

<?php // https://stackoverflow.com/questions/26548634/find-all-duplicates-values-in-multi-dimensional-array-php

$data = array(
  0 => array('email' => 'abc@abc.com','name'=>'abc'),
  1 => array('email' => 'xyz@abc.com','name'=>'xyz'),
  2 => array('email' => 'uvw@abc.com','name'=>'uvw'),
  3 => array('email' => 'abc@abc.com','name'=>'str'),
 );

// two passes required

// first pass: count of emails
$emailCounts = array();

foreach($data as $emailEntry) {
    if (isset($emailCounts[$emailEntry['email']])) {
        $emailCounts[$emailEntry['email']] += 1;
    }
    else {
        $emailCounts[$emailEntry['email']] = 1;
    }
}

// second pass: extract duplicate emails (count > 1)
$duplicateEmails = array();

foreach($data as $emailEntry) {
    if ($emailCounts[$emailEntry['email']] > 1) {
       $duplicateEmails[] = $emailEntry;
    }
}

// show output...
var_dump($emailCounts);

var_dump($duplicateEmails);

实际输出：

array
  'abc@abc.com' => int 2
  'xyz@abc.com' => int 1
  'uvw@abc.com' => int 1

array
  0 => 
    array
      'email' => string 'abc@abc.com' (length=11)
      'name' => string 'abc' (length=3)
  1 => 
    array
      'email' => string 'abc@abc.com' (length=11)
      'name' => string 'str' (length=3)

Answer 4

Here is the code for you
>$mainarray=array(
  0 => array('email' => 'abc@abc.com','name'=>'abc'),
 1 => array('email' => 'xyz@abc.com','name'=>'xyz'),
 2 => array('email' => 'uvw@abc.com','name'=>'uvw'),
 3 => array('email' => 'abc@abc.com','name'=>'str'),
 );

foreach($mainarray as $single){
$emailarray[]=$single['email'];
}
foreach(array_count_values($emailarray) as $val => $c)
   if($c > 1) $dups[] = $val;

foreach($mainarray as $single){
    if(in_array($single['email'], $dups)){
        $result[]=$single;
    }
}
    echo '<pre>';print_r($result);

在多维数组php中查找所有重复值

4 个答案: