回答編集履歴
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追記
test
CHANGED
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@@ -19,3 +19,31 @@
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```
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# 複数の要素
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array_walK()を使う手もあります
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```PHP
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31
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$a=[
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['100','101'],
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['102','103'],
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['104','105'],
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];
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$b=[];
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array_walk($a,function($x) use (&$b){$b=array_merge($b,$x);});
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var_dump($b);
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```
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