Question

到处都找到了删除php或mysql中重复条目的解决方案。但是所有这些解决方案都删除了整行，但我只想删除列的值。例如我在mysql中有这个SELECT：

SELECT HE_FRUIT as fruit, CA_FRUIT as candy, CA_FRUIT_NAME as name, CA_FRUIT_color as color 
FROM fruits LEFT JOIN candy ON HE_FRUIT_ID = CA_FRUIT_ID 
WHERE CA_FRUIT_COUNTRY LIKE '%usa%' 
GROUP BY CA_FRUIT_TITLE 
ORDER BY CA_FRUIT_PRIO, CA_FRUIT_HE

我打印数组，我明白了：

array
  0 => 
      array
      fruit = "APPLE"
      candy = "lolly"
      name = "xxx"
      color = "green"
   1 => 
      array
      fruit = "APPLE"
      candy = "gum"
      name = "xxx"
      color = "blue"
  2 => 
      array
      fruit = "APPLE"
      candy = "candy"
      name = "xxx"
      color = "red"
  3 => 
      array
      fruit = "BANANA"
      candy = "lolly"
      name = "xxx"
      color = "yellow"

我想要的是：

  0 => 
      array
      fruit = "APPLE"
      candy = "lolly"
      name = "xxx"
      color = "green"
   1 => 
      array
      fruit = ""
      candy = "gum"
      name = "xxx"
      color = "blue"
  2 => 
      array
      fruit = ""
      candy = "candy"
      name = "xxx"
      color = "red"
  3 => 
      array
      fruit = "BANANA"
      candy = "lolly"
      name = "xxx"
      color = "yellow"

因此，只有柱状水果的价值应该被移除，但其余部分应该保留。

有人知道如何解决这个问题，而不需要额外的代码吗？

提前非常感谢？

Answer 1

试试这个：

<?php

    $data = array(
      0 => array(
          'fruit' => "APPLE",
          'candy' => "lolly",
          'name' => "xxx",
          'color' => "green"
      ),
      1 => array(
          'fruit' => "APPLE",
          'candy' => "gum",
          'name' => "xxx",
          'color' => "blue"
      ),
      2 => array(
          'fruit' => "APPLE",
          'candy' => "candy",
          'name' => "xxx",
          'color' => "red"
      ),
      3 => array(
          'fruit' => "BANANA",
          'candy' => "lolly",
          'name' => "xxx",
          'color' => "yellow"
      )
    );

    foreach($data as $i => $dataRow)
    {
        foreach($dataRow as $fieldName => $fieldValue)
        {
            for($j=0; $j<$i; $j++)
            {
                if($data[$j][$fieldName] == $fieldValue)
                {
                    $data[$i][$fieldName] = '';
                }
            }
        }
    }

    print_r($data);

?>

Answer 2

您是否需要结果数组只是一维的？如果没有，我建议你可以将数组处理成一个多维数组，如下所示：

$array=array(
  0 => 
      array(
      'fruit' => "APPLE",
      'candy' => "lolly",
      'name' => "xxx",
      'color' => "green"),
  1 => 
      array(
      'fruit' => "APPLE",
      'candy' => "gum",
      'name' => "xxx",
      'color' => "blue"),
  2 => 
      array(
      'fruit' => "APPLE",
      'candy' => "candy",
      'name' => "xxx",
      'color' => "red"),
  3 => 
      array(
      'fruit' => "BANANA",
      'candy' => "lolly",
      'name' => "xxx",
      'color' => "yellow")
);

$output = array();
foreach( $array as $arrayItem ) {
    if( !isset( $output[$arrayItem['fruit']]) ) {
        $output[$arrayItem['fruit']] = array();
    }
    $outputItem = $arrayItem;
    unset( $outputItem['fruit'] );
    $output[$arrayItem['fruit']][] = $outputItem;
}

通过循环原始数据集可以达到相同的效果，您不需要创建一维PHP数组，然后再次处理它。这只是为了让例子更加清晰。

Answer 3

SELECT DISTINCT或array_unique()和朋友不会在这里帮助您：您不希望禁止重复行，您想操纵他们有不同的水果：空的字符串。

所以你最终需要一个循环：

//Assumes your resultset is in $myarray
$fruits=array();

for ($i=0;$i<sizeof($myarray);$i++)
  if (in_array($myarray[$i]['fruit'],$fruits)) $myarray[$i]['fruit']='';
  else $fruits[]=$myarray[$i]['fruit'];

php或mysql删除重复的条目数组

3 个答案: