关于两个数组循环判断的问题

[junchen168168]

代码如下：
说明：当循环$arrEmails这个数组时，判断$arrEmails与$arrMails中是否具有相同的值，如果有就选中复选框，该怎么弄？
<?php
$arrEmails = array(
array('id'=>1,'email'=>'[e-mail]','name'=>'111','createtime'=>'2011-1-22 17:12:12'),
array('id'=>2,'email'=>'[e-mail]','name'=>'222','createtime'=>'2011-1-21 14:12:12'),
array('id'=>2,'email'=>'[e-mail]','name'=>'333','createtime'=>'2011-1-20 14:12:12'),
array('id'=>2,'email'=>'[e-mail]','name'=>'444','createtime'=>'2011-1-19 14:12:12')
);
$arrMails = array(
array('mail'=>'[e-mail]'),
array('mail'=>'[e-mail]')
);
foreach($arrEmails as $arrEmail):
?>
<input type="checkbox" name="email" id="email" value="<?php echo $arrEmail['email']?>" /><?php echo $arrEmail['name']?><br />
<?php
endforeach;
?>

[goosman]

$arrMails = array(
array('mail'=>'[e-mail]'),
array('mail'=>'[e-mail]')
);
把你这个数组变成
$arrMailsHash = array('[e-mail]' => 1, '[e-mail]' => 1)这样的hash表方式(这个变换一个循环就够了).

然后在你循环中就好判断了
<input checked="<?php echo isset($arrMailsHash[$arrEmail['email']] ? 'true' : 'false' ?>" />

[tangjianft]

<?php
foreach($arrEmails as $r):
?>
<input type="checkbox" name="email" id="email" value="<?php echo $r['email']?>" <?php if (in_array($r['email'], $arrMails)) echo 'checked'?>/><?php echo $r['name']?><br />
<?php
endforeach;
?>

[转身]

3楼正解

[junchen168168]

3楼的代码我怎么运行了没有效果啊

[老骥伏枥]

我感觉也是三楼直观。
关键是学习了 in_array 函数的应用。

[junchen168168]

你运行过了代码吗？
<?php
foreach($arrEmails as $k=> $r):
?>
<input type="checkbox" name="email" id="email" value="<?php echo $r['email']?>" <?php if (in_array($r['email'], $arrMails[$k])) echo "checked='checked'"; ?>/><?php echo $r['name']?><br />
<?php
endforeach;
?>
这么写是可以但是要两个数组的长度相等！

[ihefe]

数组是二维不能直接搜索，应该这样

$arrEmails = array(
array('id'=>1,'email'=>'[e-mail]','name'=>'111','createtime'=>'2011-1-22 17:12:12'),
array('id'=>2,'email'=>'[e-mail]','name'=>'222','createtime'=>'2011-1-21 14:12:12'),
array('id'=>2,'email'=>'[e-mail]','name'=>'333','createtime'=>'2011-1-20 14:12:12'),
array('id'=>2,'email'=>'[e-mail]','name'=>'444','createtime'=>'2011-1-19 14:12:12')
);
$arrMails = array(
array('mail'=>'[e-mail]'),
array('mail'=>'[e-mail]')
);
$i=-1;
foreach($arrEmails as $arrEmail):
$i++;
?>
<input type="checkbox" name="email" id="email" value="<?php echo $r['email']?>"
<?php if(is_array($arrMails[$i]))if(in_array($arrEmail['email'], $arrMails[$i])) echo 'checked';?>/><?php echo $arrEmail['name']?><br />
<?php
endforeach;

[goosman]

我觉得单独开辟一个中间的数组作为hash表来做, 性能上要好一些的.

嵌套循环时间开销毕竟是比较大的.

楼上ihefe的解法, 如果$arrMails和$arrEmails中的第二维数组顺序不一致...结果也会不正确的.

[ihefe]

[Quote=引用 9 楼 lgg201 的回复:]

我觉得单独开辟一个中间的数组作为hash表来做, 性能上要好一些的.

嵌套循环时间开销毕竟是比较大的.

楼上ihefe的解法, 如果$arrMails和$arrEmails中的第二维数组顺序不一致...结果也会不正确的.
[/Quote]
也对。顺序也会改变，这样吧

$arrEmails = array(
array('id'=>1,'email'=>'[e-mail]','name'=>'111','createtime'=>'2011-1-22 17:12:12'),
array('id'=>2,'email'=>'[e-mail]','name'=>'222','createtime'=>'2011-1-21 14:12:12'),
array('id'=>2,'email'=>'[e-mail]','name'=>'333','createtime'=>'2011-1-20 14:12:12'),
array('id'=>2,'email'=>'[e-mail]','name'=>'444','createtime'=>'2011-1-19 14:12:12')
);
$arrMails = array(
array('mail'=>'[e-mail]'),
array('mail'=>'[e-mail]')
);
$newArray=array();
foreach($arrMails as $value)
{
	$newArray[]=$value["mail"];
}
foreach($arrEmails as $arrEmail):
?>
<input type="checkbox" name="email" id="email" value="<?php echo $r['email']?>"
<?php if(in_array($arrEmail['email'], $newArray)) echo 'checked';?>/><?php echo $arrEmail['name']?><br />
<?php
endforeach;

[junchen168168]

感谢1#和10#的大哥！