php - 帮助 PHP 和 HTML 复选框

Question

我在使用复选框和 PHP 方面需要帮助。我只是想用 PHP 确定复选框是否被选中的值。

例子:

<?php
include ("inc/conf.php");
$id = $_SESSION['id'];

if(isset($_POST['subfrm'])){
  $gtid = $_REQUEST['tid'];

  $ch1 = $_REQUEST['ch1'];
  if($ch1 == "ON"){
    $gch1 = "Y";
  } else {
    $gch1 = "N";
  }

  $ch2 = $_REQUEST['ch2'];
  if($ch2 == "ON"){
    $gch2 = "Y";
  } else {
    $gch2 = "N";
  }

  mysql_query("UPDATE SET ctable ch1='$gch1', ch2='$gch2' WHERE id='$gtid'");
}
?>

<form method="post" action="<?php echo $_SERVER['PHP_SELF']; ?>">
<input type="hidden" name="tid" value="<?php echo $id; ?>" />
<input type="checkbox" name="ch1" />Hats
<input type="checkbox" name="ch2" />Watches
<textarea name="thetext"></textarea>
<input type="submit" name="subfrm" value="PUNCH ME" />
</form>

Answer 1

if(isset($_REQUEST["ch1"])){
    $gch1 = "Y";
} else {
    $gch1 = "N";
}
if(isset($_REQUEST["ch2"])){
    $gch2 = "Y";
} else {
    $gch2 = "N";
}

您不需要检查值是什么，因为如果不检查它不会提交任何数据，如果检查它会提交 on 的值.