HTML多选控件提交的表单数据在PHP里如何显示？

<form action="recv.php"> UserName: <input type="text" name="username" /><br /> Sex: <input type="radio" name="sex" value="male" checked="checked" />Male <input type="radio" name="sex" value="female" />Female<br/> Profession: <select name="profession"> <option value="student">Student</option> <option value="teacher">Teacher</option> <option value="worker">Worker</option> </select><br /> Favourite: <input type="checkbox" name="favourite" value="basketball" checked="checked" />Basketball <input type="checkbox" name="favourite" value="volleyball" />Volleyball <input type="checkbox" name="favourite" value="football" />Football<br /> <input type="submit" value="Submit" /> </form> recv.php代码如下： <?php echo '<pre>'; print_r($_GET); echo '</pre>'; ?>

1:php获取 checkbox复选框值的方法

<html xmlns="http://www.jb51.net/1999/xhtml"> 
<head> 
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" /> 
<title>php获取 checkbox复选框值的方法</title> 
</head> 
<body> 
<form name="form1" method="post" action=""> 
<label> 
<input type="checkbox" name="checkbox[]" value="复选一"> 
复选一 
</label> 
<label> 
<input type="checkbox" name="checkbox[]" value="复选二"> 
</label> 
复选二 
<label> 
<input type="checkbox" name="checkbox[]" value="复选三"> 
</label> 
复选三 
<label> 
<input type="checkbox" name="checkbox[]" value="复选四"> 
</label> 
复选四 
<label> 
<input type="submit" name="Submit" value="提交"> 
</label> 
</form> 
</body> 
</html> 
<? 
if( $_POST ) 
{ 
$value = $_POST['checkbox']; 
echo '你选择了:'.implode(',',$value); 
//由于checkbox属性，我们必须把checkbox复选择框的名字设置为一个如果checkbox[]，这样php才能读取，以数据形式,否则不能正确的读取checkbox复选框的值哦。//脚本之家 jb51.net 整理 
} 
?>

checkbox在php读取值时要用数组形式哦，我们读取这些值用php post获取是以一个array形式哦，

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 
<html xmlns="http://www.w3.org/1999/xhtml"> 
<head> 
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" /> 
<title>php获取多选框checkbox值</title> 
</head> 
<body> 
<?php 
$area_arr = array(); 
if($_GET['action']=="submit"){ 
$area_arr = $_POST['area']; 
} 
echo "您选定的地区为: "; 
foreach ($area_arr as $k=>$v){ 
echo $v." "; 
} 
?> 
<form id="form1" name="form1" method="post" action="?action=submit"> 
<p>河北 
<label> 
<input type="checkbox" id="area" name="area[]" value="河北"> 
</label> 
</p> 
<p>河南 
<label> 
<input type="checkbox" id="area[]" name="area[]" value="河南"> 
</label> 
</p> 
<p>山西 
<label> 
<input type="checkbox" id="area[]" name="area[]" value="山西"> 
</label> 
</p> 
<p>山东 
<label> 
<input type="checkbox" id="area[]" name="area[]" value="山东"> 
</label> 
</p> 
<p>江苏 
<label> 
<input type="checkbox" id="area[]" name="area[]" value="江苏"> 
</label> 
</p> 
<p>浙江 
<label> 
<input type="checkbox" id="area[]" name="area[]" value="浙江"> 
</label> 
</p> 
<p> 
<label> 
<input type="submit" name="Submit" value="提交"> 
</label> 
</p> 
</form> 
</body> 
</html>

php checkbox默认选择问题（都是利用的这种原理）

<input name="jb51" type="checkbox" value="jiaju" <?php if($myrow[fujia_jiaju]) echo("checked");?>>

2：指定size属性显示几个项，但是size小于option数量需要滚动

 <select name="profession" multiple size="2">
    <option value="student">Student</option>
    <option value="teacher">Teacher</option>
    <option value="worker">Worker</option>
</select>