PHP循环如何一个不循环 其他都循环?
打印出来的数组:
<code>Array ( [0] => Array ( [name] => 第一章 [cname] => 1 雅典娜的圣斗士 ) [1] => Array ( [name] => 第一章 [cname] => 2 燃烧吧。。。 ) )</code>
foreach($k as $v){} 输出的时候,发现第一章也跟着循环
<code>第一章 1雅典娜的圣斗士 第一章 2 燃烧吧。。。</code>
如何做到 第一章这个字段只循环1次呢?
<code>第一章 1雅典娜的圣斗士 2 燃烧吧。。。</code>
<code>Array ( [0] => Array ( [name] => 第一章 [0] => Array( [cname] => 1 雅典娜的圣斗士 ) [1] => Array( [cname] => 2 燃烧吧 ) ) )</code>
回复内容:
打印出来的数组:
<code>Array ( [0] => Array ( [name] => 第一章 [cname] => 1 雅典娜的圣斗士 ) [1] => Array ( [name] => 第一章 [cname] => 2 燃烧吧。。。 ) )</code>
foreach($k as $v){} 输出的时候,发现第一章也跟着循环
<code>第一章 1雅典娜的圣斗士 第一章 2 燃烧吧。。。</code>
如何做到 第一章这个字段只循环1次呢?
<code>第一章 1雅典娜的圣斗士 2 燃烧吧。。。</code>
<code>Array ( [0] => Array ( [name] => 第一章 [0] => Array( [cname] => 1 雅典娜的圣斗士 ) [1] => Array( [cname] => 2 燃烧吧 ) ) )</code>
<?php $a = [ ['name' => '第一章', 'cname' => '1 雅典娜的圣斗士'], ['name' => '第一章', 'cname' => '2 燃烧吧'], ['name' => '第二章', 'cname' => '1 燃烧吧'], ['name' => '第二章', 'cname' => '2 小宇宙'], ]; $result = []; foreach ($a as $chap) { $name = $chap['name']; if (!isset($result[$name])) { $result[$name] = []; } $result[$name][] = $chap['cname']; } print_r($result);
output:
<code>Array ( [第一章] => Array ( [0] => 1 雅典娜的圣斗士 [1] => 2 燃烧吧 ) [第二章] => Array ( [0] => 1 燃烧吧 [1] => 2 小宇宙 ) )</code>
修改为完全符合题主输出的答案
<code><?php $a = [ ['name' => '第一章', 'cname' => '1 雅典娜的圣斗士'], ['name' => '第一章', 'cname' => '2 燃烧吧'], ['name' => '第二章', 'cname' => '1 燃烧吧'], ['name' => '第二章', 'cname' => '2 小宇宙'], ]; $result = []; $nameMap = []; foreach ($a as $chap) { $name = $chap['name']; if (!isset($nameMap[$name])) { $id = count($nameMap); $nameMap[$name] = $id; } else { $id = $nameMap[$name]; } if (!isset($result[$id])) { $result[$id] = []; $result[$id]['name'] = $name; } $result[$id][] = ['cname' => $chap['cname']]; } print_r($result);</code>
output
<code>Array ( [0] => Array ( [name] => 第一章 [0] => Array ( [cname] => 1 雅典娜的圣斗士 ) [1] => Array ( [cname] => 2 燃烧吧 ) ) [1] => Array ( [name] => 第二章 [0] => Array ( [cname] => 1 燃烧吧 ) [1] => Array ( [cname] => 2 小宇宙 ) ) )</code>
燃烧吧应该是雅典娜圣斗士的子类?
我理解的意思是:一个结构中存放章节序号和章节名,遍历整个列表,相同章节序号只输出一次。
提供个思路,记录上一次的name,遍历数组元素,每次拿出一个元素的时候比较该元素的name字段和上一次的name是否一样,一样不输出,否则输出并记录,以下是不算标准伪代码的伪代码:
<code>string lastName = ""; foreach(node in list) { if (lastName != node.name) { print(node.name); lastName = node.name } else {} print(node.cname); }</code>
由于题目改过了:
新的:
<code>foreach (node in chaList) { print(name); foreach (sec in secList) { print(cname); } }</code>

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