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php读取文本限制输出几多条

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WBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOriginal
2016-06-13 12:35:34906browse

php读取文本限制输出多少条
$host = file('./aa/host.txt');
$keys = file('./aa/keys.txt');
for($j=count($host)-1;$j>=0;$j--){;
echo '

  • '.trim($keys[$j]).'
    • '.PHP_EOL;
    }
    ?>

    现在是全部输出了 怎么做限制输出多少条 请大侠帮忙完整写下啊
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