一次选定数组中的每一个数，记下当前位置并假设它是从当前位置开始后面数中的最小数min=i，从这个数的下一个数开始扫描直到最后一个数，并记录下最小数的位置min，扫描结束后如果min不等于i，说明假设错误，则交换min与i位置上数。
代码如下:
/**
* 简单选择排序 simple selection sort
*
* 原理: 一次选定数组中的每一个数，记下当前位置并假设它是从当前位置开始后面数中的最小数min=i，从这个数的下一个数开始扫描直到最后一个数，并记录下最小数的位置min，扫描结束后如果min不等于i，说明假设错误，则交换min与i位置上数。
*/
function sort_simple_selection($list)
{
$len = count($list);
if(empty($len)) return $list;
for($i = 0;$i {
$min = $i;
for($j = $i + 1; $j {
//if($list[$j] > $list[$min]) // 从大到小
if($list[$j] {
$min = $j;
}
echo implode(',',$list)."#pos=".($min + 1)." min=".$list[$min]."
";
}
if($min != $i)
{
$temp = $list[$i];
$list[$i] = $list[$min];
$list[$min] = $temp;
}
echo "-------------------------
";
}
}
$list = array(4,3,2,1,5,7,3,7);
$list = sort_simple_selection($list);
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