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<?php
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/**
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 * Created by PhpStorm.
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 * User: a
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 * Date: 22.03.18
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 * Time: 13:41
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 */
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	'str3'
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);
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foreach ($arr as $value) {
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	$a .= $value;
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}
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echo $a; //выведет str1str2str3