我正在尝试使用PHP从基于XML的Atom Feed中提取图像src。我想通过在Feed中对字符串进行切片来做到这一点，以便仅抓取URL。
到目前为止，我已经能够使用substr()命令来切片特定的字符串长度。问题是图片URL的长度通常在供稿中有所不同，因此我需要根据特定字符进行切片。
我尝试使用explode指定要分割的字符：
foreach ($array['entry'] as $post) {
if ($current > $max) break;
$posts[] = [
'post_img' => explode("\"", $post['content'], 2),
...但是那没用。这是我要从中提取的XML代码：
<content type="html"><img alt="" class="attachment image image" src="http://awpagesociety.com/attachments/20aa91b841d6a49dd945a97af37509add2680573/store/limit/452/300/e6941ac426f6cbca5774cad6f2e8b6447c96d92d32957be6709dac201de7/Brady-Bush.jpg"
这是完整的方法。 url，post_content和post_title字段均正确分配：
$feed = getRssFile();
if ($feed == false) return;
$xml = simplexml_load_file($feed);
$json = json_encode($xml);
$array = json_decode($json,TRUE);
$posts = [];
if (count($array['entry'])) {
$max = 3;
$current = 1;
foreach ($array['entry'] as $post) {
if ($current > $max) break;
$posts[] = [
'post_img' => explode("src=", $post['content'], //isn't working
'post_title' => $post['title'],
'post_content' => substr(sanitizeContent($post['content']), 0, 200),
'url' => $post['link']['@attributes']['href']
];
$current++;
}
}
return $posts;
}
explode（）不会为图像的src字段分配任何内容。它只是说img src(unknown)，除了我需要的结果之外，还有其他选择吗？在此先感谢！
编辑：这是从操作中返回的内容
$exp = explode("src=", $thing);
var_dump($exp[1]);
var_dump($exp);
结果：
string(226) ""http://awpagesociety.com/attachments/c881c9ec924cfd1ee7f0650f2b6de9b36d4e31a9/store/limit/452/300/25f7a5696d2bd1d5e4d1137924ff04e3e2c8333fa8c71e005462a4e710d9/Walker_Recording.jpg" /><iframe style="border: none" " array(3) { [0]=> string(43) " string(226) ""http://awpagesociety.com/attachments/c881c9ec924cfd1ee7f0650f2b6de9b36d4e31a9/store/limit/452/300/25f7a5696d2bd1d5e4d1137924ff04e3e2c8333fa8c71e005462a4e710d9/Walker_Recording.jpg" /><iframe style="border: none" " [2]=> string(3454) ""//html5-player.libsyn.com/embed/episode/id/9576506/height/90/theme/custom/thumbnail/yes/direction/forward/render-playlist/no/custom-color/000000/" height="90" width="50%" scrolling="no" allowfullscreen="" webkitallowfullscreen="" mozallowfullscreen="" oallowfullscreen="" msallowfullscreen=""><span id="selection-marker-1" class="redactor-selection-marker"></span></iframe> <p><em><br></em></p> <p><em>If you’re interested in more conversations like this on The New CCO, subscribe on <span class="redactor-unlink"></span><span class="redactor-unlink"></span><a href="https://podcasts.apple.com/us/podcast/upskilling-a-workforce-reggie-walker-pwc/id1212422149?i=1000436862014" target="_blank">iTunes</a>, <span class="redactor-unlink"></span><a href="https://play.google.com/music/m/Dd6jidfd7eq4pzgwx7p3w6gigxm?t=Upskilling_a_Workforce_-_Reggie_Walker_PwC-The_New_CCO" target="_blank">Google Play</a>, or <span class="redactor-unlink"></span><span class="redactor-unlink"></span><a href="https://open.spotify.com/show/5oLW0nzEPyNo7mfcSFfIcu?si=gDn3b288RoiG8k9Xz9xH6g" target="_blank">Spotify</a>.</em></p> <p class="text-center">* * *</p> <p>Enterprises face severe disruption, whether via technology, business model, new competition, etc. In order to keep up, organizations must answer fundamental questions about the nature of their business, starting with their people. “What kind of culture do we need to compete in our industry? What does it look like, feel like, sound like? What are the base skills our people possess? Where do they come from?” </p> <p>These are some of the questions Reggie Walker, Chief Commercial Officer at PwC, has wrestled with while leading the enterprise's communications function over the past three years. He’s led a critical organization-wide effort around digital upskilling to better align PwC’s people with its business strategy. He’s also unified the Communications, Sales and Marketing functions, streamlining an operation that was once disparate entities. </p> <p>On this episode of The New CCO, we’ll learn more about each of these initiatives from Reggie and how they ladder up to a new kind of CCO role that’s swiftly changing in order to adapt to new disruptive factors. </p> <p>Here’s Reggie’s take on where he sees the future of work going over the next five years:</p> <p>“The opportunities are almost endless. We have to be responsible. And by that I mean there’s a lot of things we can do with technology. We have to make sure we’re not overextending the reach of certain technologies and cannibalizing jobs and opportunities. But, man, where will it not take us? That’s the fun part.”</p> <p><em>Do you have a story to tell? Share it with us. Please reach out to Justin Pallenik at <a href="mailto:jpallenik@page.org" target="_blank">jpallenik@page.org</a> with your CCO story.</em></p>" } string(3252) ""http://awpagesociety.com/attachments/20aa91b841d6a49dd945a97af37509add2680573/store/limit/452/300/e6941ac426f6cbca5774cad6f2e8b6447c96d92d32957be6709dac201de7/Brady-Bush.jpg" /><p>
我只想分别返回每个图像源，例如
"http://awpagesociety.com/attachments/c881c9ec924cfd1ee7f0650f2b6de9b36d4e31a9/store/limit/452/300/25f7a5696d2bd1d5e4d1137924ff04e3e2c8333fa8c71e005462a4e710d9/Walker_Recording.jpg", "http://awpagesociety.com/attachments/20aa91b841d6a49dd945a97af37509add2680573/store/limit/452/300/e6941ac426f6cbca5774cad6f2e8b6447c96d92d32957be6709dac201de7/Brady-Bush.jpg"
基本上希望剪切掉所有其他内容，例如样式标签和其他格式之间的文本。
编辑2 XML示例：
<?xml version="1.0" encoding="UTF-8"?>
<feed xml:lang="en-US" xmlns="http://www.w3.org/2005/Atom">
<id>tag:page.org,2005:/blog</id>
<link rel="alternate" type="text/html" href="https://page.org"/>
<link rel="self" type="application/atom+xml" href="https://page.org/blog.atom"/>
<title>Blog | Arthur W. Page Society</title>
<updated>2019-04-29T16:00:00Z</updated>
<entry>
<id>tag:page.org,2005:BlogPost/29039</id>
<published>2019-04-29T16:00:00Z</published>
<updated>2019-04-30T15:52:28Z</updated>
<link rel="alternate" type="text/html" href="https://page.org/blog/the-new-cco-podcast-upskilling-a-workforce-reggie-walker-pwc"/>
<title>The New CCO Podcast: Upskilling a Workforce - Reggie Walker, PwC</title>
<content type="html"><img alt="" class="attachment image image" src="http://awpagesociety.com/attachments/c881c9ec924cfd1ee7f0650f2b6de9b36d4e31a9/store/limit/452/300/25f7a5696d2bd1d5e4d1137924ff04e3e2c8333fa8c71e005462a4e710d9/Walker_Recording.jpg" />&lt;iframe style=&quot;border: none&quot; src=&quot;//html5-player.libsyn.com/embed/episode/id/9576506/height/90/theme/custom/thumbnail/yes/direction/forward/render-playlist/no/custom-color/000000/&quot; height=&quot;90&quot; width=&quot;50%&quot; scrolling=&quot;no&quot; allowfullscreen=&quot;&quot; webkitallowfullscreen=&quot;&quot; mozallowfullscreen=&quot;&quot; oallowfullscreen=&quot;&quot; msallowfullscreen=&quot;&quot;&gt;&lt;span id=&quot;selection-marker-1&quot; class=&quot;redactor-selection-marker&quot;&gt;&lt;/span&gt;&lt;/iframe&gt;
&lt;p&gt;&lt;em&gt;&lt;br&gt;&lt;/em&gt;&lt;/p&gt;
&lt;p&gt;&lt;em&gt;If you’re interested in more conversations like this on The New CCO, subscribe on&amp;nbsp;&lt;span class=&quot;redactor-unlink&quot;&gt;&lt;/span&gt;&lt;span class=&quot;redactor-unlink&quot;&gt;&lt;/span&gt;&lt;a href=&quot;https://podcasts.apple.com/us/podcast/upskilling-a-workforce-reggie-walker-pwc/id1212422149?i=1000436862014&quot; target=&quot;_blank&quot;&gt;iTunes&lt;/a&gt;,&amp;nbsp;&lt;span class=&quot;redactor-unlink&quot;&gt;&lt;/span&gt;&lt;a href=&quot;https://play.google.com/music/m/Dd6jidfd7eq4pzgwx7p3w6gigxm?t=Upskilling_a_Workforce_-_Reggie_Walker_PwC-The_New_CCO&quot; target=&quot;_blank&quot;&gt;Google Play&lt;/a&gt;, or&amp;nbsp;&lt;span class=&quot;redactor-unlink&quot;&gt;&lt;/span&gt;&lt;span class=&quot;redactor-unlink&quot;&gt;&lt;/span&gt;&lt;a href=&quot;https://open.spotify.com/show/5oLW0nzEPyNo7mfcSFfIcu?si=gDn3b288RoiG8k9Xz9xH6g&quot; target=&quot;_blank&quot;&gt;Spotify&lt;/a&gt;.&lt;/em&gt;&lt;/p&gt;
&lt;p class=&quot;text-center&quot;&gt;* * *&lt;/p&gt;
&lt;p&gt;Enterprises face severe disruption, whether via technology, business model, new competition, etc. In order to keep up, organizations must answer fundamental questions about the nature of their business, starting with their people. “What kind of culture do we need to compete in our industry? What does it look like, feel like, sound like? What are the base skills our people possess? Where do they come from?”&amp;nbsp;&lt;/p&gt;
&lt;p&gt;These are some of the questions Reggie Walker, Chief Commercial Officer at PwC, has wrestled with while leading the enterprise&#39;s communications function over the past three years. He’s led a critical organization-wide effort around digital upskilling to better align PwC’s people with its business strategy. He’s also unified the Communications, Sales and Marketing functions, streamlining an operation that was once disparate entities.&amp;nbsp;&lt;/p&gt;
&lt;p&gt;On this episode of The New CCO, we’ll learn more about each of these initiatives from Reggie and how they ladder up to a new kind of CCO role that’s swiftly changing in order to adapt to new disruptive factors.&amp;nbsp;&lt;/p&gt;
&lt;p&gt;Here’s Reggie’s take on where he sees the future of work going over the next five years:&lt;/p&gt;
&lt;p&gt;“The opportunities are almost endless. We have to be responsible. And by that I mean there’s a lot of things we can do with technology. We have to make sure we’re not overextending the reach of certain technologies and cannibalizing jobs and opportunities. But, man, where will it not take us? That’s the fun part.”&lt;/p&gt;
&lt;p&gt;&lt;em&gt;Do you have a story to tell? Share it with us. Please reach out to Justin Pallenik at &lt;a href=&quot;mailto:jpallenik@page.org&quot; target=&quot;_blank&quot;&gt;jpallenik@page.org&lt;/a&gt; with your CCO story.&lt;/em&gt;&lt;/p&gt;</content>
<author>
答案 0 :(得分：0)
您没有正确使用爆炸功能。 Explode
<?php
$thing = "<content type=\"html\"><img alt=\"\" class=\"attachment image image\" src=\"http://awpagesociety.com/attachments/20aa91b841d6a49dd945a97af37509add2680573/store/limit/452/300/e6941ac426f6cbca5774cad6f2e8b6447c96d92d32957be6709dac201de7/Brady-Bush.jpg\"";
var_dump($thing);
$exp = explode("src=", $thing);
var_dump($exp);
?>
[root@test ~]# ./test.php
string(246) "<content type="html"><img alt="" class="attachment image image" src="http://awpagesociety.com/attachments/20aa91b841d6a49dd945a97af37509add2680573/store/limit/452/300/e6941ac426f6cbca5774cad6f2e8b6447c96d92d32957be6709dac201de7/Brady-Bush.jpg""
array(2) {
[0]=>
string(67) "<content type="html"><img alt="" class="attachment image image" "
[1]=>
string(175) ""http://awpagesociety.com/attachments/20aa91b841d6a49dd945a97af37509add2680573/store/limit/452/300/e6941ac426f6cbca5774cad6f2e8b6447c96d92d32957be6709dac201de7/Brady-Bush.jpg""
}
多余的引号是出于示例目的将其推入字符串的副产品，但是如果它始终是字符串的最后一个元素，则可以获取URL。如果不是，则可以使用$ exp [1]并再次使用空格（“”）作为爆炸物，并以$ exp {[1]作为干草堆将其爆炸。结果数组将以URL作为其第一个元素。
更新为OP注释/代码：
请阅读爆炸文档。
$ thing被分配给特定的字符串
爆炸仅适用于字符串。如果我正确地解释了您，那么我在示例字符串中输入的xml值...
<content type="html"><img alt="" class="attachment image image" src="http://awpagesociety.com/attachments/20aa91b841d6a49dd945a97af37509add2680573/store/limit/452/300/e6941ac426f6cbca5774cad6f2e8b6447c96d92d32957be6709dac201de7/Brady-Bush.jpg"
是$post['content']的值。如果是这种情况，那么这就是您要爆炸的字符串。您缺少的部分：
Explode返回一个数组
要获取单个爆炸字符串，您需要引用结果数组的正确索引。再次查看我的初始示例，以确切了解爆炸返回的结果：
array(2) {
[0]=>
string(67) "<content type="html"><img alt="" class="attachment image image" "
[1]=>
string(175) ""http://awpagesociety.com/attachments/20aa91b841d6a49dd945a97af37509add2680573/store/limit/452/300/e6941ac426f6cbca5774cad6f2e8b6447c96d92d32957be6709dac201de7/Brady-Bush.jpg""
}
这是一个充满字符串的数组。通过为该键'post_img'分配explode的返回值，可以将值设为整个数组，而不是单个字符串。在$ posts中创建一个多维数组，然后尝试将值当作单个元素一样进行引用，这永远行不通。
如果仍然无法弄清楚，请提供simplexml_load_file()返回的XML的完整示例。