将数组从js发送到php

Question

I'm doing some assignment for school, and I'm stuck at passing array from js to php.

I have to say I'm not some expert and I'm still learning. I can't figure out what am I missing. Hope someone will help me.

I try like this.

 if(bets.length > 0) {
    $.ajax({ 
       url: "mybet.php", 
       method: "POST", 
       data: { bets : JSON.stringify( bets ) }, 
       success: function(res) { 
              console.log(res);
        } 
    }); 
  }

and php file

if (isset($_POST['bets'])) {
  $bets = json_decode($_POST['bets'], true);
  print_r($bets);

}

bets is an array in js.. and I want if I click on button proceed to collect that array and pass to php so I can work with it. I'm getting undefined index for bets on line $bets = json_decode($_POST['bets']);

print_r($_POST) is empty

Answer 1

You are not sending a 'proceedBet' variable in your ajax request, either you send that variable by changing the data like this:

if(bets.length > 0) {
    $.ajax({ 
       url: "mybet.php", 
       method: "POST", 
       data: { bets : JSON.stringify( bets ), proceedBet: 'Some Value' }, 
       success: function(res) { 
              console.log(res);
        } 
    }); 
  }

Or you have to change your condition to check if the bets exist like so:

if (isset($_POST['bets'])) {
  $bets = json_decode($_POST['bets'], true);
  print_r($_POST['bets']); // use print_r to check the data in the array
  //  User::redirect("ticket.php");
}