Question

I am trying to convert a JavaScript to php but I am not sure how to convert Math.random() and hexChars method in below JavaScript function to PHP, thanks for any help

JavaScript function:

    function generateId(){
        var a=[],b;
        a[8]=a[13]=a[18]=a[23]="-";
        a[14]="4";

        for(i=0;i<36;i++)
        if(!a[i]){
            b=0|Math.random()*16;
            a[i]=hexChars[i==19?b&3|8:b]
        }
        return a.join("")       
    }

PHP function I converted so far:

function generateId(){
    $a = array();
    $a[8]=$a[13]=$a[18]=$a[23]="-";
    $a[14]="4";
    for($i=0;$i<36;$i++){
        if(!$a[$i]){
        // not sure what to do here 
        }
    }
}

Edit:
it will create a string like this: 902EA4DD-5445-4435-93F2-2A5203818255

Answer 1

b = 0|Math.random()*16;

returns a random integer from 0 to 15. The equivalent PHP code is

$b = rand(0,15);

http://php.net/manual/en/function.rand.php

---

a[i]=hexChars[i==19?b&3|8:b]

hexChars is an array. In PHP, you can use the array notation to index a character from a string:

$hexChars = "0123456789ABCDEF"