PHP $_POST self：复选框的默认值

Question

好的，我正在使用 $_POST 向自身发送数据。
我有一些默认选中的复选框。 （本例中为 1 和 2）
当表单被提交时，我想用 $_POST 值覆盖这些默认值。

<?php
    $syndication_check_1 = 'checked="checked"';
    $syndication_check_2 = 'checked="checked"';
    $syndication_check_3 = '';
    if (isset($_POST['syndication'])) {
        //
    }
?>

<form name="form" method="post" action="">
    <!-- this is what I use for radiobuttons -->
    <legend>Sex:</legend>
    <input type="radio" name="sex" id="sex-1" value="M" <?php echo (!isset($_POST['sex']) || $_POST['sex'] == "M") ? 'checked="checked"': ''; ?> />
    <label for="sex-1"><?= _("Male"); ?></label>
    <input type="radio" name="sex" id="sex-2" value="F" <?php echo (isset($_POST['sex']) && $_POST['sex'] == "F") ? 'checked="checked"': ''; ?> />
    <label for="sex-2"><?= _("Female"); ?></label>

    <!-- now something similar for checkboxes -->
    <legend>Syndication:</legend>
    <input type="checkbox" name="syndication[]" id="syndication-1" value="yahoo" <?= $syndication_check_1; ?> /> <!-- checked -->
    <label for="syndication-1">Yahoo Real Estate</label>
    <input type="checkbox" name="syndication[]" id="syndication-2" value="trulia" <?= $syndication_check_2; ?> /> <!-- checked -->
    <label for="syndication-2">Trulia.com</label>
    <input type="checkbox" name="syndication[]" id="syndication-3" value="zillow" <?= $syndication_check_3; ?> />
    <label for="syndication-3">Zillow.com</label>
</form>

Answer 1

我可能会做这样的事情......

$syndicationCheck = array(
  'yahoo' => null,
  'trulia' => null,
  'zillow' => null
);

if(isset($_POST['syndication'])){
  foreach($_POST['syndication'] as $value){
    $syndicationCheck[$value] = 'checked';
  }
}


<legend>Syndication:</legend>
    <input type="checkbox" name="syndication[]" id="syndication-1" value="yahoo" <?= $syndicationCheck['yahoo']; ?> /> <!-- checked -->
    <label for="syndication-1">Yahoo Real Estate</label>
    <input type="checkbox" name="syndication[]" id="syndication-2" value="trulia" <?= $syndicationCheck['trulia']; ?> /> <!-- checked -->
    <label for="syndication-2">Trulia.com</label>
    <input type="checkbox" name="syndication[]" id="syndication-3" value="zillow" <?= $syndicationCheck['zillow']; ?> />
    <label for="syndication-3">Zillow.com</label>

Answer 2

通常像 $variable1、$variable2、$variable3 这样的名称暗示它应该是 $variable[0]、$variable[1]、$variable[2]。我在下面的内容现在只是稍微方便了一点，但是如果您扩展到更多复选框，您会非常感激。

$syndication_checkboxes 将保存每个复选框的名称和选中/未选中状态。初始分配表示“默认”状态，可能会或可能不会被 $_POST 覆盖。

<?php
    $syndication_checkboxes = array(array('name' => 'Yahoo Real Estate',  'checked' => 1),
                                    array('name' => 'Trulia.com',  'checked' => 1),
                                    array('name' => 'Zillow.com',  'checked' => 0));

    if isset($_POST['syndication'])
    {
         $arr = array_fill(0, count($syndication_checkboxes), 0)
         foreach($_POST['syndication'] as $k=>$v)  //unfortunately in this case, merges on numeric arrays dont overwrite.  This could probably be written nicer as an array_walk or map
              $arr[$k] = $v;
         foreach($arr as $k=>$v)
              $syndication_checkboxes[$k]['checked'] = $v;
    }

    //Everything up to and including <legend>Syndication...

    foreach($syndication_checkboxes as $k=>$v)
    {
        $checkString = $v['checked'] ? "checked='checked'" : '';
        echo "<input type='checkbox' name='syndication[$k]' id='syndication-$k' value='1' $checkString />";
        echo "<label for='syndication-$k' >".$v['name']."</label>";
    }
    echo "</form>"
?>

现在，如果您想添加新的复选框，您只需将其添加到顶部的 $syndication_checkboxes 分配中。这甚至可以来自包含“名称”和“默认检查”表的数据库，而不是硬编码，如果它变得非常大或者您想使用管理工具或其他工具更改它，这将是很好的。