php教程生成字符串随机码实现方法
*/
$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  $index = mt_rand(0, $validcharnumber-1);   
 $result .= $validcharacters[$index];
}
//
function getrandomstring($length = 6) {   
 $validcharacters = abcdefghijklmnopqrstuxyvwzabcdefghijklmnopqrstuxyvwz+-*#&@!?;   
 $validcharnumber = strlen($validcharacters);    
 $result = ;    
 for ($i = 0; $i   $index = mt_rand(0, $validcharnumber - 1);       
  $result .= $validcharacters[$index];   
 }    
 return $result;
}
echo getrandomstring();
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