如果值存在于主数组中，则多选添加选定属性 - php答案

【问题标题】：Multi-select add selected attribute if the value is present in the main array - php如果值存在于主数组中，则多选添加选定属性 - php
【发布时间】：2017-02-08 12:53:57
【问题描述】：

我正在使用多选和 GET 方法。我希望在基于 url 参数中的 $_GET 方法提交后重新加载表单时选择多个选项。我关联的 URL 参数是 cuisine%5B%5D=indian&cuisine%5B%5D=thai。实际上是多选择大约是cuisine。

我的代码如下：

 <select name="cuisine[]" class="selectpicker show-tick form-control" data-selected-text-format="count > 3" data-done-button="true" data-done-button-text="OK" multiple>
    <?php
        $selected_cuisine = $_GET['cuisine'];
        // Get all cuisines list by get_terms() function.Its built in wordpress
        $restaurant_cuisines = get_terms('cuisine', array('hide_empty' => false));
        $cuisines = array();
        foreach ($restaurant_cuisines as $restaurant_cuisine) {
            // echo $restaurant_cuisine;
            array_push( $cuisines, $restaurant_cuisine->slug );
            // echo $cuisines_list;
        }
        print_r ($selected_cuisine);
        print_r($cuisines);
        if(array_intersect($selected_cuisine, $cuisines)){
            $selected = 'selected';
        }else{
            $selected = '';
        }
        foreach ($restaurant_cuisines as $cuisine) {
            echo '<option value="'. $cuisine->slug .'" '. $selected .' >'. $cuisine->name .'</option>';
        }
    ?>
</select>

但问题是每个选项都被选中。实际上共有3 cuisines : indian, thai & chainese 和2 of them are selected -> indian and thai。但问题是选择了3 个选项。：/

【问题讨论】：

标签： php wordpress array-intersect

【解决方案1】：

请记住，当您使用 array_intersect 时，它设置为 true 是两个数组中至少有一个匹配项。所以一切都被选中了。您可以试试这个：

<select name="cuisine[]" class="selectpicker show-tick form-control" data-selected-text-format="count > 3" data-done-button="true" data-done-button-text="OK" multiple>
<?php
    $selected_cuisine = $_GET['cuisine'];
    // Get all cuisines list by get_terms() function.Its built in wordpress
    $restaurant_cuisines = get_terms('cuisine', array('hide_empty' => false));
    $cuisines = array();
    foreach ($restaurant_cuisines as $restaurant_cuisine) {
        array_push( $cuisines, $restaurant_cuisine->slug );
    }
    foreach ($restaurant_cuisines as $cuisine) {
        if(in_array($cuisine->slug, $selected_cuisine)){
          $selected = 'selected';
        }else{
          $selected = '';
        }
        echo '<option value="'. $cuisine->slug .'" '. $selected .' >'. $cuisine->name .'</option>';
    }
?>

【讨论】：