Because the tool requires us to write a function that can generate random strings. I was thinking that there should be many such random string generating functions on the Internet. I searched a lot on Baidu. Now I will summarize these good PHP functions for you. .
Use a for loop to traverse the characters we defined
/**
*@blog
*/
function createRandomStr($length){
$str = array_merge(range(0,9),range('a','z'),range('A','Z'));
shuffle($str);
$str = implode('',array_slice($str,0,$length));
return $str;
}
echo createRandomStr(10);
?>
echo $s . “ ”;
?>
Can generate pure numeric strings, character strings, etc. of specified length.
(Uppercase, lowercase, uppercase and lowercase, and a combination of uppercase and lowercase and numbers can also be expanded according to preference).
$length=5 below, if you change it to 10, it will be 10 digits.
Change $str = 'abcdefghijklmnopqrstuvwxyz0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ' to $str = '0123456789' which is a pure numeric string.
The code is as follows
Copy code
function getRandStr($length) { <🎜>
$str = 'abcdefghijklmnopqrstuvwxyz0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ'; <🎜>
$randString = ''; <🎜>
$len = strlen($str)-1; <🎜>
for($i = 0;$i < $length;$i ++){ <🎜>
$num = mt_rand(0, $len); <🎜>
$randString .= $str[$num]; <🎜>
} <🎜>
return $randString ; <🎜>
}<🎜>
<🎜>//How to use it is as follows<🎜>
$test=getRandStr($length=5);<🎜>
echo $test;<🎜>
?>
or use while
The code is as follows
Copy code
/**<🎜>
*/<🎜>
function createRandomStr($length){<🎜>
$str = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';//62 characters<🎜>
$strlen = 62;<🎜>
while($length > $strlen){
$str .= $str;
$strlen += 62;
}
$str = str_shuffle($str);
Return substr($str,0,$length);
}
echo createRandomStr(10);
?>
Use the idea of array and character conversion:
http://www.bkjia.com/PHPjc/631543.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/631543.htmlTechArticleBecause the tool requires us to write a function that can generate random strings. I think there should be many such functions on the Internet. Generate random string functions, Baidu has a lot of them, and I will give them below...
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