php生成指定长度的随机数字

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/**
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* 生成指定长度的随机数字
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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; $i 15
if ($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