仅打印 foreach 中每个重复项的最后一项

Question

我有一个非常简单的数组，但有一些重复的条目。 我只想在每个重复项的末尾打印 cmets 列。我正在使用 php 框架 codeigniter v3。

请看下表结构：

下面是我迄今为止尝试过的代码，但它在第一项的开头打印。

    $Test_Comments = "";
    foreach($result as $value)
    {
        if ($Test_Comments != $value['Test_Comments'])
        {
            echo $value['Test_Comments'];
        }

        $Test_Comments = $value['Test_Comments'];
    }

编辑：

var_export($result);
array (
  0 => 
  array (
    'ID' => '570',
    'Patient_ID' => '4558',
    'Test_ID' => '570',
    'Test_Status' => 'Performed',
    'Head_ID' => '4769',
    'Result_Value' => 'Negative',
    'Test_Name' => 'Viral Marker ',
    'Test_Comments' => '<p><strong><em>Comments:</em></strong></p>
<p><em>Anti HCV,HbsAg were performed by immunochoromatographic Screeing Method. The Technique has Sensitivity of 99% and Sepcifity of 98% .Clinically&nbsp; inconsistent result should be reconfrimed by alternative method e.g (ELISA,PCR)</em></p>',
    
  ),
  1 => 
  array (
    'ID' => '570',
    'Patient_ID' => '4558',
    'Test_ID' => '570',
    'Test_Status' => 'Performed',
    'Head_ID' => '4769',
    'Result_Value' => 'Negative',
    'Test_Name' => 'Viral Marker ',
    'Test_Comments' => '<p><strong><em>Comments:</em></strong></p>
<p><em>Anti HCV,HbsAg were performed by immunochoromatographic Screeing Method. The Technique has Sensitivity of 99% and Sepcifity of 98% .Clinically&nbsp; inconsistent result should be reconfrimed by alternative method e.g (ELISA,PCR)</em></p>',
    
  ),
  2 => 
  array (
    'ID' => '464',
    'Patient_ID' => '4558',
    'Test_ID' => '464',
    'Test_Status' => 'Performed',
    'Head_ID' => '4769',
    'Result_Value' => '76',
    'Test_Name' => 'Random Sugar',
    'Test_Comments' => '',
    
  ),
  3 => 
  array (
    'ID' => '340',
    'Patient_ID' => '4558',
    'Test_ID' => '340',
    'Test_Status' => 'Performed',
    'Head_ID' => '4769',
    'Result_Value' => '0.7',
    'Test_Name' => 'LFT-Liver Functions Tests',
    'Test_Comments' => '',
    
  ),
  4 => 
  array (
    'ID' => '340',
    'Patient_ID' => '4558',
    'Test_ID' => '340',
    'Test_Status' => 'Performed',
    'Head_ID' => '4769',
    'Result_Value' => '0.5',
    'Test_Name' => 'LFT-Liver Functions Tests',
    'Test_Comments' => '',
    
  ),
  5 => 
  array (
    'ID' => '340',
    'Patient_ID' => '4558',
    'Test_ID' => '340',
    'Test_Status' => 'Performed',
    'Head_ID' => '4769',
    'Result_Value' => '0.2',
    'Test_Name' => 'LFT-Liver Functions Tests',
    'Test_Comments' => '',
    
  ),
  6 => 
  array (
    'ID' => '340',
    'Patient_ID' => '4558',
    'Test_ID' => '340',
    'Test_Status' => 'Performed',
    'Head_ID' => '4769',
    'Result_Value' => '29',
    'Test_Name' => 'LFT-Liver Functions Tests',
    'Test_Comments' => '',
    
  ),
  7 => 
  array (
    'ID' => '340',
    'Patient_ID' => '4558',
    'Test_ID' => '340',
    'Test_Status' => 'Performed',
    'Head_ID' => '4769',
    'Result_Value' => '32',
    'Test_Name' => 'LFT-Liver Functions Tests',
    'Test_Comments' => '',
    
  ),
  8 => 
  array (
    'ID' => '340',
    'Patient_ID' => '4558',
    'Test_ID' => '340',
    'Test_Status' => 'Performed',
    'Head_ID' => '4769',
    'Result_Value' => '164',
    'Test_Name' => 'LFT-Liver Functions Tests',
    'Test_Comments' => '',
    
  ),
  9 => 
  array (
    'ID' => '124',
    'Patient_ID' => '4558',
    'Test_ID' => '124',
    'Test_Status' => 'Performed',
    'Head_ID' => '4769',
    'Result_Value' => '0.7',
    'Test_Name' => 'RFT-Renal Function Tests',
    'Test_Comments' => '',
    
  ),
  10 => 
  array (
    'ID' => '124',
    'Patient_ID' => '4558',
    'Test_ID' => '124',
    'Test_Status' => 'Performed',
    'Head_ID' => '4769',
    'Result_Value' => '23',
    'Test_Name' => 'RFT-Renal Function Tests',
    'Test_Comments' => '',
    
  ),

)

Answer 1

您可以使用array_column 根据ID 键重新索引数组。对于每个 ID，它将始终保持最后一次出现，从而每次为您生成每个 ID 的最后一条评论。

您可以稍后在其上使用array_values() 来删除 ID 作为键。

<?php

$result= array_values(array_column($result, null, 'Test_ID'));
print_r($result);