php中数据排序与遍历函数总结
数组的排序
在php教程中，排序方式有三种，通过索引排序、通过值排序（不保留原索引）、通过值排序（保留原索引）。每种又分为升序、降序以及用户定义顺序三个函数。它们分别如下：
通过索引排序：①升序 ksort() ②降序 krsort() ③用户定义顺序 uksort()
不保留原索引值排序：①升序 sort() ②降序 rsort() ③用户定义顺序 usort()
保留原索引值排序：①升序 asort() ②降序 arsort() ③用户定义顺序 uasort()
在php中，也可以用array_multisort来一次排序多个数组，不过项目中可能用得比较少。
翻转数组，把数字索引翻转，索引重新从0开始：array_reverse()
把索引和值调换：array_flip()
随机顺序：shuffle()
迭代器遍历
$test01 = array('a', 'b', 'c');
// for
for ($i = 0; $i echo $test01[$i];
}
// foreach value only
foreach ($test01 as $value) {
echo $value;
}
// foreach key and value
$test01 = array('a' => 'aaaa', 'b' => 'bbbb', 'c' => 'cccc');
foreach ($test01 as $key => $value) {
echo "$key => $value";
}
$test01 = array('a' => 'aaaa', 'b' => 'bbbb', 'c' => 'cccc');
while (list($key, $value) = each($test01)) {
echo "$key => $value" . "
";
}
php中，迭代遍历主要要用到以下函数。
current() 迭代的当前元素。
reset() 重新移动到第一个元素并返回它。
next() 移动到下一个元素并返回它。
prev() 移动到上一个元素并返回它。
end() 移动到最后一个元素并返回它。
each() 以数组的形式返回当前元素的索引和值，并移动到下一个迭代。
key() 返回当前的索引。
array_ walk() 为每一个元素调用函数。
array_ reduce() 为每一个元素依次计算。
变通遍历
array_walk($test01, walk_test);
function walk_test($key, $value) {
echo "walk: $key => $value" . "
";
}
$test02 = array(1, 2, 3, 4, 5);
echo array_reduce($test02, reduce_test);
function reduce_test($run_result, $current_value) {
return $run_result + $current_value * $current_value;
}
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