How to generate random numbers in php-PHP Tutorial-php.cn

How to generate random numbers in php

黄舟

Release： 2023-03-17 10:04:02

Original

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I believe that when friends see the title, their first reaction is Use function to implement PHP random numbers. So what functions are there to implement PHP random numbers? So today we will introduce to you what methods are there for generating random numbers in PHP?

How to use php to generate non-repeating random numbers between 1-10?

1. Use the shuffle function to generate php random numbers.

<?php
$arr=range(1,10);
shuffle($arr);
foreach($arr as $values)
{
 echo $values." ";
}
?>

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2, use the array_unique function to generate php random numbers.

<?php
$arr=array();
while(count($arr)<10)
{
 $arr[]=rand(1,10);
 $arr=array_unique($arr);
}
echo implode(" ",$arr);
?>

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Example 3, use the array_flip function to generate PHP random numbers, which can remove duplicate values.

<?php
$arr=array();
$count1=0;
$count = 0;
$return = array();
while ($count < 10) 
 {
 $return[] = mt_rand(1, 10);
 $return = array_flip(array_flip($return));
 $count = count($return);
 } //www.jb51.net
foreach($return as $value)
 {
 echo $value." ";
 }
echo "<br/>";
$arr=array_values($return);// 获得数组的值 
foreach($arr as $key)
echo $key." ";
?>

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php Random number generation function example

<?php
function randpw($len=8,$format=&#39;ALL&#39;){
$is_abc = $is_numer = 0;
$password = $tmp =&#39;&#39;; 
switch($format){
case &#39;ALL&#39;:
$chars=&#39;ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789&#39;;
break;
case &#39;CHAR&#39;:
$chars=&#39;ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz&#39;;
break;
case &#39;NUMBER&#39;:
$chars=&#39;0123456789&#39;;
break;
default :
$chars=&#39;ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789&#39;;
break;
} // www.jb51.net
mt_srand((double)microtime()*1000000*getmypid());
while(strlen($password)<$len){
$tmp =substr($chars,(mt_rand()%strlen($chars)),1);
if(($is_numer <> 1 && is_numeric($tmp) && $tmp > 0 )|| $format == &#39;CHAR&#39;){
$is_numer = 1;
}
if(($is_abc <> 1 && preg_match(&#39;/[a-zA-Z]/&#39;,$tmp)) || $format == &#39;NUMBER&#39;){
$is_abc = 1;
}
$password.= $tmp;
}
if($is_numer <> 1 || $is_abc <> 1 || empty($password) ){
$password = randpw($len,$format);
}
return $password;
}
for($i = 0 ; $i < 10; $i++){
echo randpw(8,&#39;NUMBER&#39;);
echo "<br>";
}

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Summary:

php There are many ways to generate random numbers, and each method has its own characteristics and effects. So in our daily development, we only need to choose a certain method according to our own business needs!

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