PHP数组处理

深碍√TFBOYSˉ_ 2022-05-27 03:16 186阅读 0赞

一、一个数组里面有两组数据，指定的key的value作为新的索引，另一个key的value作为新索引的value

public static function index(array $array, $name)
    {
        $indexedArray = array();
    
        if (empty($array)) {
            return $indexedArray;
        }
    
        foreach ($array as $item) {
            if (isset($item[$name])) {
                $indexedArray[$item[$name]] = $item;
                continue;
            }
        }
    
        return $indexedArray;
    }

例如：$array = array(array('id'=>1,

'name'=>'xiaogou'

array('id'=>2,

'name'=>'xiaomao'

)

直接return index($array,'id');

结果就是array('1'=>'xiaogou','2'=>'xiaomao');

二、获取数组指定key的value集合

public static function column(array $array, $columnName)
    {
        if (empty($array)) {
            return array();
        }
    
        $column = array();
    
        foreach ($array as $item) {
            if (isset($item[$columnName])) {
                $column[] = $item[$columnName];
            }
        }
    
        return $column;
    }

例如：$array = array(array('id'=>1,'name'='xiaogou'),array('id'=>2,'name'=>'xiaomao'));

$array\_ids = column($array,'id');

$array\_ids 结果就是array(0=>1,1=>2);

三、获取数组指定key的值（与上面的集合不同，这个是直接获取值）

public static function get(array $array, $key, $default)
    {
        if (isset($array[$key])) {
            return $array[$key];
        } else {
            return $default;
        }
    }

四、替换多维数组的相同键的值

public static function rename(array $array, array $map)
    {
        $keys = array_keys($map);
    
        foreach ($array as $key => $value) {
            if (in_array($key, $keys)) {
                $array[$map[$key]] = $value;
                unset($array[$key]);
            }
        }
    
        return $array;
    }

五、返回两个数组的交集

array_intersect

if(array_intersect($array1, $array2)){

return ture;

六、多维数据按某个key对应value值排序

//按指定完成拼团剩余人数最少值升序排序
    $sort = array(
        'direction' => 'SORT_ASC',//排序顺序标志 SORT_DESC 降序；SORT_ASC 升序
        'field' => 'residue_num',//排序字段
    );
    $arrSort = array();
    foreach ($pinTuanIng AS $uniqid => $row) {
        foreach ($row AS $key => $value) {
            $arrSort[$key][$uniqid] = $value;
        }
    }
    if ($sort['direction']) {
        array_multisort($arrSort[$sort['field']], constant($sort['direction']), $pinTuanIng);
    }

七、多维数据按多个key对应的value值排序

$sort = array(
        'direction' => 'SORT_ASC',//排序顺序标志 SORT_DESC 降序；SORT_ASC 升序
        'field' => 'residue_num',//排序字段
        'field2' => 'residue_time',//排序字段
    );
    $arrSort = array();
    foreach ($pinTuanIng AS $uniqid => $row) {
        foreach ($row AS $key => $value) {
            $arrSort[$key][$uniqid] = $value;
        }
    }
    if ($sort['direction']) {
        array_multisort($arrSort[$sort['field']], constant($sort['direction']), $arrSort[$sort['field2']], constant($sort['direction']), $pinTuanIng);
    }

2018.7.11

八、把数组的键值相同的找出来当做键名重新分组

/**
     * 获取拼团课程
     * @param string $num 查询个数 为0或空时返回全部数据
     * @return array
     */
    public function getPinCourse($num)
    {
        try {
            $where = array('status' => '1');
            $res = $this->slave1()->where($where)->getAll();
            $res = json_decode(json_encode($res), true);
            if (!empty($num)) {
                $res = array_slice($res, 0, $num);
            }
    
            $new = array();
            //按单全科分组
            foreach ($res as $val) {
                $type = $val['goods_type'];
                !isset($new[$type]) && $new[$type] = array();
                $new[$type][] = $val;
            }

**二维数组去重项2018-9-27**

<table style="width:620px;"> 
 <tbody> 
  <tr> 
   <td>&nbsp;代码如下</td> 
   <td>&nbsp;</td> 
  </tr> 
  <tr> 
   <td colspan="2" style="vertical-align:top;"> 
    <table> 
     <tbody> 
      <tr> 
       <td>1</td> 
       <td>例如：</td> 
      </tr> 
      <tr> 
       <td>2</td> 
       <td>$result = array(<br> &nbsp;&nbsp;&nbsp; 0=&gt;array('a'=&gt;1,'b'=&gt;'Hello'),<br> &nbsp;&nbsp;&nbsp; 1=&gt;array('a'=&gt;1,'b'=&gt;'other'),<br> &nbsp;&nbsp;&nbsp; 2=&gt;array('a'=&gt;1,'b'=&gt;'other'),<br> );</td> 
      </tr> 
      <tr> 
       <td>3</td> 
       <td>处理成</td> 
      </tr> 
      <tr> 
       <td>4</td> 
       <td>$result = array(<br> &nbsp;&nbsp;&nbsp; 0=&gt;array('a'=&gt;1,'b'=&gt;'Hello'),<br> &nbsp;&nbsp;&nbsp; 1=&gt;array('a'=&gt;1,'b'=&gt;'other')&nbsp;&nbsp;<br> );</td> 
      </tr> 
      <tr> 
       <td>5</td> 
       <td>使用方法</td> 
      </tr> 
      <tr> 
       <td>6</td> 
       <td><span style="color:#f33b45;"><strong>array_unique($result, SORT_REGULAR);</strong></span></td> 
      </tr> 
     </tbody> 
    </table></td> 
  </tr> 
 </tbody> 
</table>

**二维数组的重复项：**

对于二维数组咱们分两种情况讨论，一种是因为某一键名的值不能重复，删除重复项；另一种因为内部的一维数组不能完全相同，而删除重复项，下面举例说明：

㈠因为某一键名的值不能重复，删除重复项

PHP

<table style="width:620px;"> 
 <tbody> 
  <tr> 
   <td>&nbsp;代码如下</td> 
   <td>&nbsp;</td> 
  </tr> 
  <tr> 
   <td colspan="2" style="vertical-align:top;"> 
    <table> 
     <tbody> 
      <tr> 
       <td>1</td> 
       <td>&lt;?php</td> 
      </tr> 
      <tr> 
       <td>2</td> 
       <td>function assoc_unique($arr, $key) { <br> &nbsp;&nbsp;&nbsp; $tmp_arr = array();<br> &nbsp;&nbsp;&nbsp; <a href="http://www.111cn.net/tags.php/foreach/" rel="nofollow">foreach</a> ($arr as $k =&gt; $v) { <br> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; if (in_array($v[$key], $tmp_arr)) {//搜索$v[$key]是否在$tmp_arr数组中存在，若存在返回true<br> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; unset($arr[$k]);<br> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; } else { <br> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; $tmp_arr[] = $v[$key];<br> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; }<br> &nbsp;&nbsp;&nbsp; }<br> &nbsp;&nbsp;&nbsp; sort($arr); //sort函数对数组进行排序<br> &nbsp;&nbsp;&nbsp; return $arr;<br> }</td> 
      </tr> 
      <tr> 
       <td>3</td> 
       <td>$aa = array(<br> &nbsp;&nbsp;&nbsp; array('id' =&gt; 123, 'name' =&gt; '张三'),<br> &nbsp;&nbsp;&nbsp; array('id' =&gt; 123, 'name' =&gt; '李四'),<br> &nbsp;&nbsp;&nbsp; array('id' =&gt; 124, 'name' =&gt; '王五'),<br> &nbsp;&nbsp;&nbsp; array('id' =&gt; 125, 'name' =&gt; '赵六'),<br> &nbsp;&nbsp;&nbsp; array('id' =&gt; 126, 'name' =&gt; '赵六')<br> );<br> $key = 'id';<br> assoc_unique(&amp;$aa, $key);<br> print_r($aa);<br> ?&gt;</td> 
      </tr> 
     </tbody> 
    </table></td> 
  </tr> 
 </tbody> 
</table>

显示结果为：Array ( \[0\] => Array ( \[id\] => 123 \[name\] => 张三 ) \[1\] => Array ( \[id\] => 124 \[name\] => 王五 ) \[2\] => Array ( \[id\] => 125 \[name\] => 赵六 ) \[3\] => Array ( \[id\] => 126 \[name\] => 赵六 ) )

㈡因内部的一维数组不能完全相同，而删除重复项

<table style="width:620px;"> 
 <tbody> 
  <tr> 
   <td>&nbsp;代码如下</td> 
   <td>&nbsp;</td> 
  </tr> 
  <tr> 
   <td colspan="2" style="vertical-align:top;"> 
    <table> 
     <tbody> 
      <tr> 
       <td>1</td> 
       <td><br> &lt;?php<br> &nbsp;<br> function array_unique_fb($array2D) { <br> &nbsp;&nbsp;&nbsp; foreach ($array2D as $v) { <br> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; $v = join(",", $v); //降维,也可以用implode,将一维数组转换为用逗号连接的字符串<br> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; $temp[] = $v;<br> &nbsp;&nbsp;&nbsp; }<br> &nbsp;&nbsp;&nbsp; $temp = array_unique($temp);//去掉重复的字符串,也就是重复的一维数组<br> &nbsp;&nbsp;&nbsp; foreach ($temp as $k =&gt; $v) { <br> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; $temp[$k] = <a href="http://www.111cn.net/tags.php/explode/" rel="nofollow">explode</a>(",", $v);//再将拆开的数组重新组装<br> &nbsp;&nbsp;&nbsp; }<br> &nbsp;&nbsp;&nbsp; return $temp;<br> }<br> &nbsp;<br> $aa = array(<br> &nbsp;&nbsp;&nbsp; array('id' =&gt; 123, 'name' =&gt; '张三'),<br> &nbsp;&nbsp;&nbsp; array('id' =&gt; 123, 'name' =&gt; '李四'),<br> &nbsp;&nbsp;&nbsp; array('id' =&gt; 124, 'name' =&gt; '王五'),<br> &nbsp;&nbsp;&nbsp; array('id' =&gt; 123, 'name' =&gt; '李四'),<br> &nbsp;&nbsp;&nbsp; array('id' =&gt; 126, 'name' =&gt; '赵六')<br> );<br> $bb = array_unique_fb($aa);<br> print_r($bb)<br> ?&gt;</td> 
      </tr> 
     </tbody> 
    </table></td> 
  </tr> 
 </tbody> 
</table>

显示结果：Array ( \[0\] => Array ( \[0\] => 123 \[1\] => 张三 ) \[1\] => Array ( \[0\] => 123 \[1\] => 李四 ) \[2\] => Array ( \[0\] => 124 \[1\] => 王五 ) \[4\] => Array ( \[0\] => 126 \[1\] => 赵六 ) )