CODEWITHSUNDEEP
javascriptphp
Anisha Virat
Anisha Virat

Reputation: 259

converting piece of javascript code to php

HI i am trying to convert javascript code to php.below is the javascript code

<script>

 var prefs = '["w",32,"r","s",2,"w",65,"w",26,"w",45,"w",24,"w",40,"s",2]';
var si = "hellocode";
var sig = (si + "").split("");

          function swap(arr, b) {
              l3 = arr[0];
              l4 = arr[b % arr.length];
              arr[0] = l4;
              arr[b] = l3;
              return arr
          }

          var cmd = JSON.parse(prefs||'["r","r"]');

          cmd.forEach(function (c, i) {
            if (typeof c !== "string") {
              return;
            }
            switch (c) {
            case "r":
              sig = sig.reverse();
              break;
            case "s":
              sig = sig.slice(cmd[i+1]);
              break;
            case "w":
              sig = swap(sig, cmd[i+1]);
              break;
            }
          });

</script>

What i have tried so far in php

<?php

$prefs = '["w",32,"r","s",2,"w",65,"w",26,"w",45,"w",24,"w",40,"s",2]';
$si = "hellocode";
$arr = str_split($si);
$sig = implode(',', $arr);


          function swap($arr, $b) {
              $cool = explode(",",$arr);
              $l3 = $cool[0];
              $l4 = $cool[$b % length($cool)];
              $cool[0] = $l4;
              $cool[$b] =$l3;
              return $cool;
          }
  //   $cool  = json_decode($prefs||'["r","r"]'); 
  //now i am struck with converting $prefs to array

$i=0;
foreach($cool as $c)
{

// how to get type of string here ?
// And what does slice function do ?
}

I got struck in 2nd part ? please see the comments and some experts in js to php ..guide me please.:)

Upvotes: 2

Views: 1862

Answers (1)

KeyNone
KeyNone

Reputation: 9150

In PHP you have is_string to check if a variable is a string.

slice extracts a part of an array (in JS), the PHP pendant is array_slice when working with arrays or substr when working with strings.

You found json_decode already, so just take a look at the examples in the manual.
You max have to split prefs||'["r","r"]' into an if-else to check if prefs isn't empty, but i don't know how PHP handles the or-operator in this case.

To convert the .forEach from JS to PHP, i wouldn't go for a foreach(...), as you won't have access to i as in the JS callback. Utilize a simple for-loop here.

for($i = 0; $i < count($cool); $i++) { /*....*/ }

Upvotes: 1

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