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Home Backend Development PHP Tutorial php数组foreach出来如何控制里面的顺序?

php数组foreach出来如何控制里面的顺序?

Jun 23, 2016 pm 02:05 PM

<?php         /*查询关键字5个宝贝,按照热销降序排列*/         $items = $itemManager->queryByKeyword(" ","hotsell",5);         foreach($items as $i=>$item){              echo "宝贝标题:". $item->title;         }    ?>
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这是淘宝的根据关键字查询宝贝的接口,foreach出来是5个宝贝的标题;
比如foreach出来宝贝的顺序是

1 2 3 4 5

然后我分别再foreach,对应的宝贝顺序是:
5 1 2 3 4

继续foreach ,对应的宝贝顺序是:

4 5 1 2 3

继续foreach ,对应的宝贝顺序是:

3 4 5 1 2

最后一次 foreach ,对应的宝贝顺序是:

2 3 4 5 1


这个可以这么实现?


回复讨论(解决方案)

我觉得可以先用list()重新给数组排序,再foreach

你 再foreach 是在同一个程序里吗?

你 再foreach 是在同一个程序里吗?

我觉得这个问题要再延伸一下:
是同一个浏览者访问时执行多次foreach,还是不同浏览者访问同一个php期望foreach得到不同的顺序?
后者比较麻烦

引用 2 楼 xuzuning 的回复:你 再foreach 是在同一个程序里吗?

我觉得这个问题要再延伸一下:
是同一个浏览者访问时执行多次foreach,还是不同浏览者访问同一个php期望foreach得到不同的顺序?
后者比较麻烦

是同一个人访问时 执行多次foreach 代码类似下面这样

$items = $itemManager->queryByKeyword(" ","hotsell",5);         foreach($items as $i=>$item){              echo 出来的标题顺序是 :1 2 3 4 5          }		 		 foreach($items as $i=>$item){              echo 出来的标题顺序是 :5 1 2 3 4         }		 		 foreach($items as $i=>$item){              echo 出来的标题顺序是 :4 5 1 2 3         }		 		 foreach($items as $i=>$item){              echo 出来的标题顺序是 :3 4 5 1 2         }		 		 foreach($items as $i=>$item){              echo 出来的标题顺序是 :2 3 4 5 1         }
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最终的效果是在同一个页面里面 标题这样排序
1 2 3 4 5
5 1 2 3 4
4 5 1 2 3
3 4 5 1 2
2 3 4 5 1

我觉得这个问题要再延伸一下:
是同一个浏览者访问时执行多次foreach,还是不同浏览者访问同一个php期望foreach得到不同的顺序?
后者比较麻烦 没必要吧?
如果是在同一程序中遍历多次,只需 foreach 前
$items[] = array_shift($items);

如果是每一次访问,则需要
$n = microtime(1) % count($items);
for($i=0; $i<$n; $i++) $items[] = array_shift($items);


我之所以那么回复,是因为他并没有把自己的需求说清楚!

引用 3 楼 snmr_com 的回复:我觉得这个问题要再延伸一下:
是同一个浏览者访问时执行多次foreach,还是不同浏览者访问同一个php期望foreach得到不同的顺序?
后者比较麻烦没必要吧?
如果是在同一程序中遍历多次,只需 foreach 前
$items[] = array_shift($items);

如果是每一次访问,则需要
$n =……

版主,这个我看不懂 是什么意思?

$items[] = array_shift($items);

我也是没理解他的需求,只是想到可能期望展示商品不同的人不同顺序,避免某些商品总是排在前面,但也不想用随机顺序这种需求??偶N年前遇到这么一个客户有这样需求

$items = array(1,2,3,4,5);foreach($items as $v) echo $v;echo '<br>';$items[] = array_shift($items); foreach($items as $v) echo $v;echo '<br>';$items[] = array_shift($items); foreach($items as $v) echo $v;echo '<br>';
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你动动手就知道了

我也是没理解他的需求,只是想到可能期望展示商品不同的人不同顺序,避免某些商品总是排在前面,但也不想用随机顺序这种需求??偶N年前遇到这么一个客户有这样需求

其实没那么复杂 我的需求是只要在一个页面里面 相同的宝贝 按照不同的顺序来排列,不需要考虑不同人,就是每个人访问看到的内容是一样的

<div>  <ul>    <li>宝贝 1</li>    <li>宝贝 2</li>    <li>宝贝 3</li>    <li>宝贝 4</li>    <li>宝贝 5</li>  </ul>  <ul>    <li>宝贝 2</li>    <li>宝贝 3</li>    <li>宝贝 4</li>    <li>宝贝 5</li>    <li>宝贝 1</li>  </ul>  <ul>    <li>宝贝 3</li>    <li>宝贝 4</li>    <li>宝贝 5</li>    <li>宝贝 1</li>    <li>宝贝 2</li>  </ul>  <ul>    <li>宝贝 4</li>    <li>宝贝 5</li>    <li>宝贝 1</li>    <li>宝贝 2</li>    <li>宝贝 3</li>  </ul>  <ul>    <li>宝贝 5</li>    <li>宝贝 1</li>    <li>宝贝 2</li>    <li>宝贝 3</li>    <li>宝贝 4</li>  </ul></div>
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我就想获得这样的效果, 我需要foreach 5次,可是 我foreach出来的 没办法更改他的顺序,我想按照上面那样,每次ul里面的宝贝顺序不一样

PHP code?123456789101112$items = array(1,2,3,4,5); foreach($items as $v) echo $v;echo '
'; $items[] = array_shift($items); foreach($items as $v) echo $v;echo '
'; $items[] = array_s……


好的 我试试

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