PHP数组排序之sort、asort与ksort用法实例,asortksort
PHP数组排序之sort、asort与ksort用法实例,asortksort
本文实例讲解了PHP数组排序中sort、asort与ksort的用法,供大家参考借鉴之用。具体实例如下所示:
<?php $arr = array('d'=>'sdf', 'r'=>'sdf', 'a'=> 'eee'); //sort($arr); // 对数组的值进行重排, 删除之前的键值, 变为索引数组 //asort($arr); // 对数组按照值进行重排,并保持索引关系,索引数组和关联数组均适用 ksort($arr); // 对数组按照键值进行重排,并保持索引关系,索引数组和关联数组均适用 // 对应逆序还有rsort arsort krsort // 使用函数比较有usort uksort uasort 第二个参数为比较的函数 需要在第一个参数相等 小于 大于第二个参数时 返回 等于 小于 大于 0 的值 浮点数只会取整数部分 print_r($arr); ?>
本文实例中仅对ksort用法做了示范,感兴趣的读者可以再测试sort与asort的运行结果,以便加深印象,牢固掌握。希望本文实例对大家PHP程序设计有所帮助。
不知道你是怎么写的,是少了个planet1,不过不用它也行,就用这个2就可以了,还有就是数组那块分割用逗号,别用分号,语句结束用分号.下面是我改的.自己看吧..
$planet2=array(
'X'=>'Earth',
'Y'=>'Venus',
'Z'=>'Mars',
'A'=>'Jupiter',
'B'=>'Saturn',
);
asort($planet2);
echo '使用函数asort对数组元素排序:';
echo '
';
foreach($planet2 as $key => $value)
{
echo 'planet2['.$key.']='.$value;
echo '
';
echo '
';
}
echo '
';
echo '使用函数ksort对数组元素排序:';
echo '
';
ksort($planet2);
foreach($planet2 as $key=>$value)
{
echo 'planet2['.$key.']='.$value;
echo '
';
echo '
';
}
?>
a1,a12,a2,b1 php自带的sort应该结果是这样。
他是一个一个字符比的。
你要想你这样数字当个整体,就得自己来了。
将数组做成这个样子就行
例如
array('a1','a2','a11','b1','b11')
处理成
array(
'a'=>array(
1=>array('a1'),
2=>array('a2'),
11=>array('a11')
),
'b'=>array(
1=>array('b1'),
11=>array('b11')
)
)

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