如何在循环里插入5b7a15bed8615d1b843806256bebea72？
$data = array (
0 =>
array (
'id' => '1',
'name' => 'web编程',
'parentid' => '0',
),
1 =>
array (
'id' => '2',
'name' => 'php',
'parentid' => '1',
),
2 =>
array (
'id' => '3',
'name' => 'ajax',
'parentid' => '1',
),
3 =>
array (
'id' => '4',
'name' => 'java',
'parentid' => '1',
),
4 =>
array (
'id' => '5',
'name' => 'winform编程',
'parentid' => '0',
),
5 =>
array (
'id' => '6',
'name' => 'vb',
'parentid' => '5',
),
6 =>
array (
'id' => '7',
'name' => 'vc',
'parentid' => '5',
),
);
这么一个数组，想得到下面的效果。
<select name="categorys">
<optgroup label="web编程">
<option value="2" >php</option>
<option value="3" >ajax</option>
<option value="4" >java</option>
</optgroup>
<optgroup label="winform编程">
<option value="6" >vb</option>
<option value="7" >vc</option>
</optgroup>
</select>
难点在于如何在foreach里判断把<option>包含在<optgroup>里，折腾了半天也没出办法。请高手指点如何完成。
$data = array (
0 => array (
'id' => '1',
'name' => 'web编程',
'parentid' => '0',
),
1 => array (
'id' => '2',
'name' => 'php',
'parentid' => '1',
),
2 => array (
'id' => '3',
'name' => 'ajax',
'parentid' => '1',
),
3 => array (
'id' => '4',
'name' => 'java',
'parentid' => '1',
),
4 => array (
'id' => '5',
'name' => 'winform编程',
'parentid' => '0',
),
5 => array (
'id' => '6',
'name' => 'vb',
'parentid' => '5',
),
6 => array (
'id' => '7',
'name' => 'vc',
'parentid' => '5',
),
);
echo '<select name="categorys">';
foreach($data as $v) {
if($v['parentid'] == 0)
echo "<optgroup label='$v[name]'>";
else
echo "<option value='$v[id]' >$v[name]</option>";
}
echo '</select>';
唠叨大哥，你上面的操作还是缺了结束符啊</optgroup>
我就是在苦闷如何把这个</optgroup>加进去。
echo "<optgroup label='$v[name]'>$v[name]</optgroup>";
稍微改下就行了。
$data = array (
0 =>
array (
'id' => '1',
'name' => 'web编程',
'parentid' => '0',
),
1 =>
array (
'id' => '2',
'name' => 'php',
'parentid' => '1',
),
2 =>
array (
'id' => '3',
'name' => 'ajax',
'parentid' => '1',
),
3 =>
array (
'id' => '4',
'name' => 'java',
'parentid' => '1',
),
4 =>
array (
'id' => '5',
'name' => 'winform编程',
'parentid' => '0',
),
5 =>
array (
'id' => '6',
'name' => 'vb',
'parentid' => '5',
),
6 =>
array (
'id' => '7',
'name' => 'vc',
'parentid' => '5',
),
);
$temparray = array();
foreach($data as $item){
$temparray[$item['parentid']][$item['id']] = $item['name'];
}
echo '<select name="categorys">';
foreach($temparray[0] as $parentid=>$name){
echo "<optgroup label=\"$name\">";
foreach($temparray[$parentid] as $id=>$name){
echo "<option value=\"$id\" >$name</option>";
}
echo '</optgroup>';
}
echo '</select>';
只是foreach了三次怕效率较差，不知还没有有别的方法。
重做数组的话……
$data = array (
array (
'id' => '1',
'name' => 'web编程',
'parentid' => '0',
'sub'=>
array(
array(
'id' => '2',
'name' => 'php',
'parentid' => '1',
),
array (
'id' => '3',
'name' => 'ajax',
'parentid' => '1',
),
array (
'id' => '4',
'name' => 'java',
'parentid' => '1',
)
)
),
array (
'id' => '5',
'name' => 'winform编程',
'parentid' => '0',
'sub'=>
array(
array (
'id' => '6',
'name' => 'vb',
'parentid' => '5',
),
array (
'id' => '7',
'name' => 'vc',
'parentid' => '5',
)
)
)
);
echo '<select style="width:200px;">';
for($i=0,$il=count($data);$i<$il;$i++){
echo '<optgroup label="'.$data[$i]['name'].'">';
for($j=0,$jl=count($data[$i]['sub']);$j<$jl;$j++){
echo '<option>'.$data[$i]['sub'][$j]['name'].'</option>';
}
echo '<optgroup>';
}
echo '</select>';
是吗？
哦，是少了个 </optgroup>
不过我测试代码时并没有感觉出有与没有的差异
一定要有的话，就加个开关变量。要多次循环干什么？
echo '<select name="categorys">';
$k = false;
foreach($data as $v) {
if($v['parentid'] == 0) {
echo "<optgroup label='$v[name]'>";
$k = true;
}else {
if($k) echo '</optgroup>';
echo "<option value='$v[id]' >$v[name]</option>";
$k = false;
}
}
echo '</select>';
以上就是在循环里如何使用<optgroup>标签的详细内容。