从数组中删除重复项（阵列通过按键UNIC） [英] remove duplicates from array (array unic by key)

问题描述

 阵列
（
    [0] =＆GT;排列
        （
            [文件] =＆GT; /var/websites/example.com/assets/images/200px/1419050406e6648e1c766551a0ffc91380fd6ff3406002011-10-233750.jpg
            [MD5] =＆GT; 42479bee7a304d2318250de2ef1962a9
            [URL] =＆GT; http://example.com/assets/images/200px/1419050406e6648e1c766551a0ffc91380fd6ff3406002011-10-233750.jpg
        ）    [1] =＆GT;排列
        （
            [文件] =＆GT; /var/websites/example.com/assets/images/200px/21277792606e6648e1c766551a0ffc91380fd6ff3406002011-10-233750.jpg
            [MD5] =＆GT; 42479bee7a304d2318250de2ef1962a9
            [URL] =＆GT; http://example.com/assets/images/200px/21277792606e6648e1c766551a0ffc91380fd6ff3406002011-10-233750.jpg
        ）
）
 

我怎样才能从上面数组中删除MD5密钥副本？

解决方案

 ＆LT; PHP
$数据=阵列（
  阵列（
    'MD5'=＆GT; 'α'，
    某些=＆GT; '值'，
  ）
  阵列（
    'MD5'=＆GT; 'α'，
    某些=＆GT; 其他的价值，
  ）
  阵列（
    'MD5'=＆GT; 喝彩，
    某些=＆GT; 第三值'，
  ）
）;
//行走输入数组
$ _data =阵列（）;
的foreach（$的数据作为V $）{
  如果（使用isset（$ _数据[$ V ['MD5']））{
    //发现重复
    继续;
  }
  //记住的特定项目
  $ _data [$ V ['MD5'] = $ V;
}
//如果您需要$ _data零基于阵列，otheriwse工作
$数据= array_values​​（$ _数据）;
 

Array
(
    [0] => Array
        (
            [file] => /var/websites/example.com/assets/images/200px/1419050406e6648e1c766551a0ffc91380fd6ff3406002011-10-233750.jpg
            [md5] => 42479bee7a304d2318250de2ef1962a9
            [url] => http://example.com/assets/images/200px/1419050406e6648e1c766551a0ffc91380fd6ff3406002011-10-233750.jpg
        )

    [1] => Array
        (
            [file] => /var/websites/example.com/assets/images/200px/21277792606e6648e1c766551a0ffc91380fd6ff3406002011-10-233750.jpg
            [md5] => 42479bee7a304d2318250de2ef1962a9
            [url] => http://example.com/assets/images/200px/21277792606e6648e1c766551a0ffc91380fd6ff3406002011-10-233750.jpg
        )
)

How can I remove md5 key duplicates from above array?

解决方案

<?php
$data = array(
  array(
    'md5' => 'alpha',
    'some' => 'value',
  ),
  array(
    'md5' => 'alpha',
    'some' => 'other value',
  ),
  array(
    'md5' => 'bravo',
    'some' => 'third value',
  ),
);
// walk input array
$_data = array();
foreach ($data as $v) {
  if (isset($_data[$v['md5']])) {
    // found duplicate
    continue;
  }
  // remember unique item
  $_data[$v['md5']] = $v;
}
// if you need a zero-based array, otheriwse work with $_data
$data = array_values($_data);

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