PHP foreach循环x次，并添加占位符 [英] PHP foreach loop x times and add placeholder

问题描述

我正在使用foreach来循环显示图像。最多有四个图像和最少的一个图像。
例如，如果有两个图像（=两个循环），我想告诉foreach他需要再循环两次，并呼应一些占位符的图片。

我的foreach：

 <？php foreach（$ users as $ k => $ v）{？> 
< img src =/ images / user_<？php echo $ k;？> .jpgalt =title =/> 
<？php}？> 
  

输出（两个循环）：

 < img src =/ images / user_0.jpgalt =title =/> 
< img src =/ images / user_1.jpgalt =title =/> 
  

但新脚本应输出：

 < img src =/ images / user_0.jpgalt =title =/> 
< img src =/ images / user_1.jpgalt =title =/> 
< img src =/ images / user_placeholder.jpgalt =title =/> 
< img src =/ images / user_placeholder.jpgalt =title =/> 
  

不要忘记$ users可以有x个条目（0-4）

解决方案

使用 array_fill 可以根据需要填充所有项目（因为它们全部相同），然后将其打印出来。

 <？php foreach（$ users as $ k => $ v）{？> 
< img src =/ images / user_<？php echo $ k;？> .jpgalt =title =/> 
<？php}？> 
 
<？php 
 echo implode（''，array_fill（0，count（$ users），'placeholder image HTML'））; 
  

当然，您也可以使用另一个 foreach 在每个迭代中打印占位符图像HTML

$ b 更新事实证明，还有一个更好的方法：
$ b $ $ p $ echo str_repeat（'placeholder image HTML'，count（$ users））;


PHP真的有许多功能需要记住。 ：）

I am using a foreach to loop through image. There are maximum four images and minimum 1 image. For example if there are two image (= two loops) i want to tell the foreach he needs to loop two times again and echo some placeholder pictures.

Heres my foreach:

<?php foreach($users as $k => $v) {?>
<img src="/images/user_<?php echo $k; ?>.jpg" alt="" title="" />
<?php } ?>

Outputs (two loops):

<img src="/images/user_0.jpg" alt="" title="" />
<img src="/images/user_1.jpg" alt="" title="" />

but the new script should output:

<img src="/images/user_0.jpg" alt="" title="" />
<img src="/images/user_1.jpg" alt="" title="" />
<img src="/images/user_placeholder.jpg" alt="" title="" />
<img src="/images/user_placeholder.jpg" alt="" title="" />

dont forget its possible that $users can have x entries (0-4)

解决方案

Use array_fill to fill an array with as many items as needed (since they are all going to be identical) and then print them out.

<?php foreach($users as $k => $v) {?>
<img src="/images/user_<?php echo $k; ?>.jpg" alt="" title="" />
<?php } ?>

<?php
echo implode('', array_fill(0, count($users), 'placeholder image HTML'));

Of course instead of this cuteness you could also use another foreach that prints placeholder image HTML in each iteration.

Update: It turns out there's an even better method:

echo str_repeat('placeholder image HTML', count($users));

PHP really has too many functions to remember. :)

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