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【www.gdgbn.com--C语言】
$people=array("name","sex","nation","birth");
foreach ($people as $mychrs)
echo $mychrs." ";
sort($people);
echo "
---排序后---
";
foreach ($people as $mychrs)
echo $mychrs." ";
?>
升序排序后的数组元素显示为 birth name nation sex，当然，sort()函数是区分字母大小写的（字母从大到小的顺序是：a…z…a…z）
sort()函数还具有第二参数，用来说明升序的规则是用来比较数字还是字符串的
echo "---按数字升序排序---
";
$num2=array("26","3",);
sort($num2,sort_numeric);
foreach ($num2 as $mychrs)
echo $mychrs." ";
echo "
---按字符升序排序---
";
$num3=array("26","3");
sort($num3,sort_string);
foreach ($num3 as $mychrs)
echo $mychrs." ";
?>
php中关联数组的排序
php除了支持数字索引数组以外，还支持相关数组。比如如下数组就是一个相关(关联)数组：
$peoples=array("xm"=>"name","xb"=>"sex","mz"=>"nation","cs"=>"birth");
使用sort($peoples)默认即是按照元素定义值的升序排序，在关联数组中可使用asort()函数表示，关联数组中最主要的则是可按照关键字（如xm、xb、mz等）的升序排序，该方法是用函数ksort()函数。
$peoples=array("xm"=>"name","xb"=>"sex","mz"=>"nation","cs"=>"birth");
foreach ($peoples as $mychrs)
echo $mychrs." ";
echo "
--按元素值升序排列--
";
asort($peoples);
foreach ($peoples as $mychrs)
echo $mychrs." ";
echo "
--按关键字升序排列--
";
ksort($peoples);
foreach ($peoples as $mychrs)
echo $mychrs." ";
?>