A method of implementing simple digital verification Code in PHP

This article mainly introduces PHP implementation of simple digital verification code method, interested in the friend's reference, I hope to help you.

A randomly generated 5-bit digital verification code written in PHP

$yzm = "";  for ($i =0; $i <5; $i + +)  {  $a = rand (0,9);  $yzm. = $a;  } Echo $yzm;

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