php - 如果你需要 3 个 'tiers' 的引号，你会怎么做？

Question

例如，我知道您可以从 "转到 '，但是还有第三个吗？

我正在制作一个 $form 变量，我需要 3 个级别的引号

    $form = "<table id ='create_school_table'>
                    <tr>
                        <td>school name:</td>
                        <td><input type = 'text' maxlength='50' name='school_name' style='width: 174px;'/></td>
                    </tr>
                    <tr>
                        <td>state:</td>
                        <td><select name='state'>
                            <?php foreach ($states as $state) : ?>
                               //THIS NEXT LINE IS TRIPPING ME UP
                                <option value='<?php echo $state['state_name']; ?>'>
                                    <?php echo $state['state_name']; ?>
                                </option>
                            <?php endforeach; ?>
                    </select></td>
                    </tr>
                    <tr>
                        <td></td>
                        <td><input type='button' value='add school' name='submitbtn' onclick='execute_add_school()' /></td> 
                    </tr>
                </table>"

Answer 1

你能使用更多的变量吗？

$form = "Your initial HTML";

$states = "";
foreach ($states as $state) {
    $states .= "<option value='" . $state['state_name'] . "'>" 
            . $state['state_name'] . "</option>";
}

$form .= $states;
$form .= "the rest of your HTML";

如果您明确尝试将其全部保存在一个变量中，请随时更新您的问题以反射(reflect)这一点。