php生成字符串随机码实现方法

时间：2015-01-23 来源：西部数据作者：西部数据

*/

$validcharacters = "abcdefghijklmnopqrstuxyvwzabcdefghijklmnopqrstuxyvwz+-*#&@!?";

$index = mt_rand(0, 10);

echo $index;

//看一款复杂一点的

$validcharacters = "abcdefghijklmnopqrstuxyvwzabcdefghijklmnopqrstuxyvwz+-*#&@!?";

$validcharnumber = strlen($validcharacters);

$index = mt_rand(0, $validcharnumber-1);

$randomcharacter = $validcharacters[$index];

echo $randomcharacter;

//实例二

$length = 5;

$result = "";

for ($i = 0; $i < $length; $i++) {

$index = mt_rand(0, $validcharnumber-1);

$result .= $validcharacters[$index];

}

//

function getrandomstring($length = 6) {

$validcharacters = "abcdefghijklmnopqrstuxyvwzabcdefghijklmnopqrstuxyvwz+-*#&@!?";

$validcharnumber = strlen($validcharacters);

$result = "";

for ($i = 0; $i < $length; $i++) {

  $index = mt_rand(0, $validcharnumber - 1);

  $result .= $validcharacters[$index];

}

return $result;

}

echo getrandomstring();