回答編集履歴
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解説の追記
test
CHANGED
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@@ -25,3 +25,97 @@
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```
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---
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`$row` は次のような連想配列なので、
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```php
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array(
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'id' => 123,
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'coloum_1' => "列１",
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'coloum_2' => "列２",
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'coloum_3' => "列３",
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'coloum_5' => "列５",
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'coloum_6' => "列６",
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'coloum_7' => "列７",
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);
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```
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次のような配列を `array_diff_key` すると、
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```php
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array(
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'coloum_7' => null,
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);
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```
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次のようになります。
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```php
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array(
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'id' => 123,
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'coloum_1' => "列１",
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'coloum_2' => "列２",
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'coloum_3' => "列３",
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'coloum_5' => "列５",
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'coloum_6' => "列６",
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);
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```
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要するに `$rows['coloum_7']` を unset した新しい配列を作っているだけです。
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ぶっちゃけ次のようにしても同じですしこの方が早いです。
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```php
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$filteredRow = $row;
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unset($filteredRow['coloum_7']);
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```
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