php - $categories 配列から 1 つのタイトルのみをエコーする方法

Question

誰かが $categories 配列の複数のタイトルから "title_2 with books1,..." のみをエコーするのを手伝ってくれることを願っています

配列の例:

$categories= array(

'title_1' => "Books", 
"books1" => array( "Books1", "set1", "type"), 
"books2" => array( "books2", "set1", "type"), 
"books3" => array( "books3", "set5", "type"),

'title_2' => "Books_2", 
"books1" => array( "Books1", "set1", "type"), 
"books2" => array( "books2", "set1", "type"), 
"books3" => array( "books3", "set5", "type"),

'title_3' => "Books_3", 
"books1" => array( "Books1", "set1", "type"), 
"books2" => array( "books2", "set1", "type"), 
"books3" => array( "books3", "set5", "type"),
,....
);

ありがとう

Answer 1

これはとても簡単です....

$categories= array(

'title_1' => "Books", 
"books1" => array( "Books1", "set1", "type"), 
"books2" => array( "books2", "set1", "type"), 
"books3" => array( "books3", "set5", "type"),

'title_2' => "Books_2", 
"books1" => array( "Books1", "set1", "type"), 
"books2" => array( "books2", "set1", "type"), 
"books3" => array( "books3", "set5", "type"),

'title_3' => "Books_3", 
"books1" => array( "Books1", "set1", "type"), 
"books2" => array( "books2", "set1", "type"), 
"books3" => array( "books3", "set5", "type"),

);


echo "<pre>";
echo $categories['title_2'] , "\n"  , implode(",",$categories['books1']);

出力

Books_2
Books1,set1,type