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                > 視頻地址:[https://www.bilibili.com/video/av77259782](https://www.bilibili.com/video/av77259782) > 指定欄目輸出 > 輸出欄目ID=2名稱:`{$classtypedata[2]['classname']}` > 判斷是否有下級: ~~~ {if($classtypedata[2]['haschild'])} 如果有下級,則這里輸出 {/if} ~~~ > 判斷是第幾級欄目:`{$classtypedata[2]['level']+1}` > 欄目鏈接url:`{$classtypedata[2]['url']}` > 有子類的時候才有,直系下級欄目id數組:`{$classtypedata[2]['children']['id']}` > ##數組的輸出方式。foreach ~~~ {foreach $classtypedata[2]['children']['id'] as $s} 輸出直系下級id:{$s} {/foreach} ~~~ > 有子類的時候才有,直系下級欄目數組:`{$classtypedata[2]['children']['id']}` > 輸出直系下級的欄目: ~~~ {foreach $classtypedata[2]['children']['list'] as $s} 輸出直系下級的欄目名稱:{$s['classname']} {/foreach} ~~~ > 所有下級(包含他自己欄目),欄目id數組:`{$classtypedata[2]['children']['ids']}` > 所有下級數組(不包含他自己欄目):`{$classtypedata[2]['children']['lists']}` ~~~ {foreach $classtypedata[2]['children']['lists'] as $s} 輸出所有下級的欄目名稱:{$s['classname']} {/foreach} ~~~ > 問題1:判斷一個欄目是不是另一個欄目的下級 > 欄目A的id為$a\_id,欄目B的id為$b\_id > #php有個函數,判斷是否為數組成員 in\_array() ~~~ {if(in_array($a_id,$classtypedata[$b_id]['children']['ids']))} 如果A是B的子類,那么輸出這里 {/if} ~~~
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