PHP code sharing for generating random strings

This article mainly introduces the method of generating random strings in PHP in detail. It has certain reference value. Interested friends can refer to it. I hope it can help everyone.

function generateRandomString($length = 10) { 
  $characters = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ'; 
  $randomString = ''; 
  for ($i = 0; $i < $length; $i++) { 
    $randomString .= $characters[rand(0, strlen($characters) - 1)]; 
  } 
  return $randomString; 
}

echo generateRandomString(20);


/**
 * 随机生成字符串
 * @param int $length
 * @return null|string
 */
private static function getRandChar($length = 8){
  $str = null;
  $strPol = "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789abcdefghijklmnopqrstuvwxyz";
  $max = strlen($strPol)-1;
 
  for($i=0;$i<$length;$i++){
    $str.=$strPol[rand(0,$max)]; //rand($min,$max)生成介于min和max两个数之间的一个随机整数
  }
 
  return $str;
}

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