PHP generates random strings that can specify pure numbers, pure letters or mixed_PHP tutorial

PHP generates a random string

You can specify whether it is pure numbers, pure letters or a mixture.

The length can be specified.

Copy code The code is as follows:

function rand_zifu($what,$number){
$string='' ;
for($i = 1; $i <= $number; $i++){
//Mixing
$panduan=1;
if($what == 3){
if(rand(1,2)==1){
$what=1;
}else{
$what=2;
}
$panduan=2;
}

//Number
if($what==1){
$string.=rand(0,9);
}elseif($what==2) {
//Letter
$rand=rand(0,24);
$b='a';
for($a =0;$a <=$rand;$a++ ){
$b++;
}
$string.=$b;
}
if($panduan==2)$what=3;
}
return $string;
}
echo rand_zifu(3,10);

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