* getcode.go

package main

import (
	"fmt"
	"math/rand"
	"strings"
	"time"
)

func GenValidateCode(width int) string {
	numeric := [10]byte{0,1,2,3,4,5,6,7,8,9}
	r := len(numeric)
	rand.Seed(time.Now().UnixNano())

	var sb strings.Builder
	for i := 0; i < width; i++ {
		fmt.Fprintf(&sb, "%d", numeric[ rand.Intn(r) ])
	}
	return sb.String()
}

func main() {
	fmt.Println( GenValidateCode(6) )
}

* compile

go build getcode.go

* run:

 for i in {1..1000}; do ./getcode; done
 

865427
788585
207486
419572
459996
752815
915632
265549
022780
158717
587900

* api文档

 

php生成4位的随机数字

	/**
	 * 生成随机4位短信码
	 * @param int $len
	 * @return string
	 */
	private static function getRandSms($len = 4) {
		$s = "0123456789";
		$n = strlen($s)-1;
		$r = "";
		while ($len-- > 0) {
			$r .= $s[ rand(0, $n) ];
		}
		return $r;
	}