PHP数组删除重复的值 - PHP array delect duplicate values

我有这个多维，我从列表中得到它。我希望该列表中的项目按"类别"分组，这是php代码：

foreach ($re_services as $re_serv){
    $ows_Category = $re_serv->getAttribute("ows_OfferingCatType");
    $ows_ServiceID = $re_serv->getAttribute("ows_Title");
    $ows_Service = $re_serv->getAttribute("ows_OfferingsName_Edit");
    $ows_Hours = $re_serv->getAttribute("ows_Hours");
    $Service_Array []= array(
        "Category" => $ows_Category,
        "ServiceID" => $ows_ServiceID,
        "Service" => $ows_Service,
        "Hours" => $ows_Hours 
    ); }

我的输出是：

大堆([0]=>数组([类别]=>造型[ServiceID:>Blow Dry-Male_104【服务】=>外螺纹吹干[小时]=>1.000000000000)[1] =>阵列([类别]=>造型[ServiceID]=>女士切块吹风机_101〔服务〕=>女士切割和吹干[小时]=>1.000000000000)[2] =>阵列([类别]=>造型[ServiceID]=>吹风时间更长_103【服务】=>更长的吹风时间[小时]=>2.000000000000000)[3] =>阵列([类别]=>造型[ServiceID]=>男士剪吹烘干_102〔服务〕=>男士切割和吹干[小时]=>1.000000000000)[4] =>阵列(【类别】=>超级服务[ServiceID]=>Half-Head_106【服务】=>半头[小时]=>1.000000000000)[5] =>阵列(【类别】=>超级服务[ServiceID]=>高亮显示/低亮度_105[服务]=>高亮/近光灯[小时]=>3.00000000000000)[6] =>阵列(【类别】=>超级服务[ServiceID]=>奢华护发素_109【服务】=>奢华美发[小时]=>4.00000000000000)[7] =>阵列([类别]=>技术[ServiceID]=>新娘发_108【服务】=>新娘头发[小时]=>4.00000000000000)[8] =>阵列([类别]=>技术[ServiceID]=>Hair Up_107[服务]=>Hair Up[小时]=>1.000000000000))

正如你所看到的，我有三个类别（风格，超级服务，技术）。现在我需要的输出是html标签，其值如下：

<select> 
<optgroup label="Category">
    <option value="ServiceID">Service Hours</option>
</optgroup> </select>

但没有任何与类别标签重复。我怎样才能做到这一点？

试试这个：

$categories = array();
foreach ($re_services as $re_serv){
    $ows_Category = $re_serv->getAttribute("ows_OfferingCatType");
    $ows_ServiceID = $re_serv->getAttribute("ows_Title");
    $ows_Service = $re_serv->getAttribute("ows_OfferingsName_Edit");
    $ows_Hours = $re_serv->getAttribute("ows_Hours");
    $Service_Array []= array(
        "Category" => $ows_Category,
        "ServiceID" => $ows_ServiceID,
        "Service" => $ows_Service,
        "Hours" => $ows_Hours 
    ); 
    //add the following part:
    if(!in_array($ows_Category, $categories))
        $categories[] = $ows_Category;
}

现在，您可以在$categories上使用foreach循环来打印正确的html标签：

echo '<select>';
foreach($categories as $category){
    echo '<optgroup label="' . $category . '">';
    foreach ($re_services as $re_serv){
        if($re_serv['Catergory'] == $category)
            echo '<option value="' . $re_serv['ServiceID'] . '">' . $re_serv['Service'] . '</option>';
    }
    echo '</optgroup>';
}
echo '</select>';

另一种选择是完全改变你的阵列结构：

foreach ($re_services as $re_serv){
    $ows_Category = $re_serv->getAttribute("ows_OfferingCatType");
    $ows_ServiceID = $re_serv->getAttribute("ows_Title");
    $ows_Service = $re_serv->getAttribute("ows_OfferingsName_Edit");
    $ows_Hours = $re_serv->getAttribute("ows_Hours");
    $Service_Array[$ows_Category][]= array(
        "ServiceID" => $ows_ServiceID,
        "Service" => $ows_Service,
        "Hours" => $ows_Hours 
    );
}
echo '<select>';
foreach($Service_Array as $category => $re_services){
    echo '<optgroup label="' . $category . '">';
    foreach($re_services as $re_serv){
        echo '<option value="' . $re_serv['ServiceID'] . '">' . $re_serv['Service'] . '</option>';
    }
    echo '</optgroup>';
}
echo '</select>';