内爆字符串并插入数组？

问题描述：

I can't get the implode function to work with my array. I'm building a site and every time you reload the page the background image is randomly chosen.

I have a loop with different image url:s like this:

<?php 
if( have_rows('pictures', 'option') ):
    while ( have_rows('pictures', 'option') ) : the_row();
        $pictures[] = get_sub_field('picture'); 
        $picturesimploded = "'" . implode("', '", $pictures) . "'";
    endwhile;
endif; 
?>

Below is the code to randomize which url is chosen:

<?php   
    $bg = array( $picturesimploded ); // array of filenames
    $i = rand(0, count($bg)-1); // generate random number size of the array
    $selectedBg = "$bg[$i]"; // set variable equal to which random filename was chosen
?>

The url is then applied to a div:

<div style="background-image: url( <?php echo $selectedBg; ?> );">

The output however prints all links:

<div style="background-image: url( 'http://example.com/image1', 'http://example.com/image1', 'http://example.com/image1' );">

It seems like the array can't separate the arrays. When I insert the links manually, directly, in the array like this it works:

<?php   
    $bg = array( 'http://example.com/image1', 'http://example.com/image1', 'http://example.com/image1' ); // array of filenames
    $i = rand(0, count($bg)-1); // generate random number size of the array
    $selectedBg = "$bg[$i]"; // set variable equal to which random filename was chosen
?>

Any ideas how to get the randomizing to work?

我无法使用implode函数来处理我的数组。我正在建立一个网站，每次你重新加载页面时，随机选择背景图像。 p>

我有一个不同图像的循环网址：这样： strong > p>

 ＆lt;？php 
if（has_rows（'pictures'，'option'））：
 while（have_rows（'pictures'，'option'））：  the_row（）; 
 $ pictures [] = get_sub_field（'picture'）;  
 $ picturesimploded =“'”。  implode（“'，'”，$ pictures）。  “';; 
 endwhile; 
endif;  
？＆gt; 
  code>  pre> 
 
  以下是随机选择哪个网址的代码： strong>  p> 
 
 
 ＆lt;？php 
 $ bg = array（$ picturesimploded）;  //文件名数组
 $ i = rand（0，count（$ bg）-1）;  //生成数组的随机数大小
 $ selectedBg =“$ bg [$ i]”;  //设置变量等于选择了哪个随机文件名
？＆gt; 
  code>  pre> 
 
  然后将网址应用于div： strong>  
 
 
 ＆lt; div style =“background-image：url（＆lt;？php echo $ selectedBg;？＆gt;）;”＆gt; 
  code>  pre  > 
 
  然而输出打印所有链接： strong>  p> 
 
 
 ＆lt; div style =“background-image：url（'http  ：//example.com/image1'，'http://example.com/image1'，'http://example.com/image1'）;“＆gt; 
  code>  pre> 
  
  

似乎数组无法分离数组。 当我直接在这样的数组中手动插入链接时，它可以工作： p> 
 
 
 ＆lt;？php 
 $ bg = array（'http://example.com  / image1'，'http://example.com/image1'，'http://example.com/image1'）;  //文件名数组
 $ i = rand（0，count（$ bg）-1）;  //生成数组的随机数大小
 $ selectedBg =“$ bg [$ i]”;  //设置变量等于选择了哪个随机文件名
？＆gt; 
  code>  pre> 
 
 任何想法如何让随机化工作？ p>

答

replace

$bg = array( $picturesimploded );

with

$bg = explode( $picturesimploded );

-- when you call

$bg = array( $picturesimploded );

you are making an array with one entry like this:

[0] => 'image,image,image,image,image'

when you use explode it will be like this

[0] => image,
[1] => image,

etc

an alternative would be to do this:

<?php 
$pictures = array();
if( have_rows('pictures', 'option') ):
    while ( have_rows('pictures', 'option') ) : the_row();
        $pictures[] = get_sub_field('picture'); 
    endwhile
endif; 

$i = rand(0, count($pictures)-1); // generate random number size of the array
$selectedBg = $pictures[$i]; // set variable equal to which random filename was chosen


?>

答

You have a string rather than a set of elements in your array constructor, separate these URLs out with explode:

$bg = explode(',', $picturesimploded);

答

flip the array to work on values.
use array_rand with 1 to get 1 random element

Example: http://ideone.com/cpV2Va

<?php

$pictures = array();
if( have_rows('pictures', 'option') ):
    while ( have_rows('pictures', 'option') ) : the_row();
       $pictures[] = get_sub_field('picture'); 
    endwhile
endif; 

$selectedBg = array_rand(array_flip($pictures), 1);

内爆字符串并插入数组？

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