回答編集履歴
1
$row[' ']の中身の記載誤り
    
        answer	
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         @@ -10,11 +10,11 @@ 
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       10 
10 
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       11 
11 
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                 echo $row['category_name'];
         
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       12 
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       13 
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                 foreach($row[' 
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 13 
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                 foreach($row[' '] as $任意の変数名1) { 
         
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                    echo $任意の変数名1['category_namea'];
         
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                   foreach( $任意の変数名1[' 
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                   foreach( $任意の変数名1[' '] as 任意の変数名2){
         
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                            echo 任意の変数名2['category_namea'];
         
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                        }
         
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