Export only selected columns in php

Question

Previously it was hardcoded, but now the requirement is that I want to download only the selected columns.

In View:

foreach ($allColumnsDBArray as $colHeading) { ?>
    <input type="checkbox" class='form' name="selectedcols[]" value="<?php echo "$colHeading"; ?>" />
    <?php echo $colHeading; echo "<br>";
}

In Controller:

public function actionExport_csv() {
    $model = new Companies();
    $session = Yii::$app->session;             
    if(isset($_POST['download'])){ if(!empty($_POST['selectedcols'])) {
        foreach($_POST['selectedcols'] as $check) {
            echo $check;//what will be the code here to download column in selectedcols
         }
    } 
}

Answer 1

我使用导出菜单小部件导出选定的列