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入门：PHP编程“数组”的基础知识(4) integer ksort(ayyay subject [,integer sort_flag])//根据 键或索引 进行升序排列
integer krsort(ayyay subject [,integer sort_flag])//根据 键或索引 进行降序排列
usort(array subject, string compare_function)//根据用户定义排序，用户定义自己的排序规则函数，但函数必须符合
uasort(array subject, string compare_function)//integer my_compare_function(mixed a, mixed b),a>b返回1，a uksort(array subject, string compare_function)//a等于b时返回0
$numbers = array(16,3,2,171,5,24,6,19);
sort($numbers);
foreach($numbers as $n)
echo $n." ";
$numbers = array(16,3,2,171,5,24,6,19);
rsort($numbers);
foreach($numbers as $n)
echo $n." ";
$numbers = array(16,3,2,171,5,24,6,19);
sort($numbers,SORT_STRING);
foreach($numbers as $n)
echo $n." ";
$a = array("o"=>"kk","e"=>"zz","z"=>"hh","a"=>"rr");
asort($a);
foreach ($a as $keyname=>$keyvalue)
echo $keyvalue;
$a = array("o"=>"kk","e"=>"zz","z"=>"hh","a"=>"rr");
ksort($a);
foreach ($a as $keyname=>$keyvalue)
echo $keyvalue;
//基于长度比较两个字符串
function cmp_length($a,$b)
{
if(strlen($a) < strlen($b))
return -1;
if(strlen($a) > strlen($b))
return 1;
return 0;
}
$animals = array("cow","ox","monkey","mimi");
usort($animals,"cmp_length");
foreach($animals as $an)
echo $an;
---------------------输出结果----------------------------------------
2 3 5 6 16 19 24 171 171 24 19 16 6 5 3 2 16 171 19 2 24 3 5 6 hhkkrrzzrrzzkkhhoxcowmimimonkey
---------------------------------------------------------------------
array_merge($a,$b)//组合数组，个人认为是比较有趣的函数之一，从两个数组生成一个数组，具有相同 键 的值会被覆盖
////////////////////////////代码部分////////////////////////////////////////
$a = array("name"=>"zhangsan",10,100);
$b = array("name"=>"lisi",4,6,8);
$c = array_merge($a,$b);
var_dump($c);
//////////////////////////////////////////////////////////////////////////
---------------------输出结果----------------------------------------
array(6) { ["name"]=> string(4) "lisi" [0]=> int(10) [1]=> int(100) [2]=> int(4) [3]=> int(6) [4]=> int(8) }
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