PHP generates random numbers of specified length_PHP tutorial

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/**
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* Generate random numbers of specified length
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* @author yangyingjie
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* @param $number
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* @return string
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​*/
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function createRandNumberBySize($number)
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{
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    $number = (int)$number;
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    if ($number === 0) {
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        return '';
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    } else {
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        $rankNumberString = "";
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        for ($i = 0; $i < $number + 1; $i++) {
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            if ($i !== 0 && $i % 2 === 0) {
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                $rankNumberString .= mt_rand(11, 99);
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            }
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        }
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        if ($number % 2 === 0) {
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            return $rankNumberString;
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        } else {
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            return $rankNumberString . mt_rand(1, 9);
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        }
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    }
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}

作者：杨哥哥