php產生字串隨機碼實現方法_PHP教程

php教程產生字串隨機碼實現方法

*/
$validcharacters = "abcdefghijklmnopqrstuxyvwzabcdefghijklmnopqrstuxyvwz+-*#&@!?";
$index = mt_rand(0, 10);
echo $index;

//看一款複雜一點的

$validcharacters = "abcdefghijklmnopqrstuxyvwzabcdefghijklmnopqrstuxyvwz+-*#&@!?";
$validcharnumber = strlen($validcharacters);
$index = mt_rand(0, $validcharnumber-1);
$randomcharacter = $validcharacters[$index];
echo $randomcharacter;

//執行個體二

$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();

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