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Two ways to generate random numbers in PHP

墨辰丷Original: 2018-05-16 16:39:221669browse

This article mainly introduces two methods of randomly generating numbers in PHP. Interested friends can refer to it. I hope it will be helpful to everyone.

The first method uses mt_rand():

function GetRandStr($length){
$str=&#39;abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789&#39;; 
$len=strlen($str)-1; 
$randstr=&#39;&#39;; for($i=0;$i<$length;$i++){ $num=mt_rand(0,$len); 
$randstr .= $str[$num]; 
} 
return $randstr; 
} 
$number=GetRandStr(6); 
echo $number;

The second method (fastest)

function make_password( $length = 8 ) 
{ 
 // 密码字符集，可任意添加你需要的字符 
 $chars = array(&#39;a&#39;, &#39;b&#39;, &#39;c&#39;, &#39;d&#39;, &#39;e&#39;, &#39;f&#39;, &#39;g&#39;, &#39;h&#39;, 
 &#39;i&#39;, &#39;j&#39;, &#39;k&#39;, &#39;l&#39;,&#39;m&#39;, &#39;n&#39;, &#39;o&#39;, &#39;p&#39;, &#39;q&#39;, &#39;r&#39;, &#39;s&#39;, 
 &#39;t&#39;, &#39;u&#39;, &#39;v&#39;, &#39;w&#39;, &#39;x&#39;, &#39;y&#39;,&#39;z&#39;, &#39;A&#39;, &#39;B&#39;, &#39;C&#39;, &#39;D&#39;, 
 &#39;E&#39;, &#39;F&#39;, &#39;G&#39;, &#39;H&#39;, &#39;I&#39;, &#39;J&#39;, &#39;K&#39;, &#39;L&#39;,&#39;M&#39;, &#39;N&#39;, &#39;O&#39;, 
 &#39;P&#39;, &#39;Q&#39;, &#39;R&#39;, &#39;S&#39;, &#39;T&#39;, &#39;U&#39;, &#39;V&#39;, &#39;W&#39;, &#39;X&#39;, &#39;Y&#39;,&#39;Z&#39;, 
 &#39;0&#39;, &#39;1&#39;, &#39;2&#39;, &#39;3&#39;, &#39;4&#39;, &#39;5&#39;, &#39;6&#39;, &#39;7&#39;, &#39;8&#39;, &#39;9&#39;, &#39;!&#39;, 
 &#39;@&#39;,&#39;#&#39;, &#39;$&#39;, &#39;%&#39;, &#39;^&#39;, &#39;&&#39;, &#39;*&#39;, &#39;(&#39;, &#39;)&#39;, &#39;-&#39;, &#39;_&#39;, 
 &#39;[&#39;, &#39;]&#39;, &#39;{&#39;, &#39;}&#39;, &#39;<&#39;, &#39;>&#39;, &#39;~&#39;, &#39;`&#39;, &#39;+&#39;, &#39;=&#39;, &#39;,&#39;, 
 &#39;.&#39;, &#39;;&#39;, &#39;:&#39;, &#39;/&#39;, &#39;?&#39;, &#39;|&#39;); 
 // 在 $chars 中随机取 $length 个数组元素键名 
 $keys = array_rand($chars, $length); 
 $password = &#39;&#39;; 
 for($i = 0; $i < $length; $i++) 
 { 
  // 将 $length 个数组元素连接成字符串 
  $password .= $chars[$keys[$i]]; 
 } 
 return $password; 
}

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