PHP: $_POST variables unexistant into functions

Question

I am bringing some info trough $_POST, but when I try to make use of this info into any function, console emerges an error about Undefined Variable (in this example, $ms_img brings an error, as well as $con -the connection query declared on conexionbbdd.php- and any othe variable inside functions.

EDIT: Neither passing as arguments works, it emerges one error per argument as this:

Warning: Missing argument 1 for checkCost(), called in C:\wamp\www...\actions\msg_newMessage.php on line 96 and defined in C:\wamp\www...\actions\msg_newMessage.php on line 17

function checkCost($con,$ms_img,$id){...}

CODE:

<?php
    session_start();
    include("../conexionbbdd.php");
    include("../conexionapi.php");

    $id = $_SESSION['id'];   
    $inclass = $_SESSION['inclass'];   

if($_SESSION['estado'] == 'activo'){

    $ms_content = $_POST['ms_content'];
    $ms_img = $_POST['ms_img'];
    $ms_prefix = $_POST['ms_prefix'];
    $ms_phone = $_POST['ms_phone'];


    function checkCost(){
            $totalCost = 0;

            if ($ms_img!=""){
                    $totalCost=2;
            }   

            else{
                    $totalCost=1;
            }

            $checkCredits=mysqli_query($con,"SELECT us_credits FROM ws_users WHERE us_id=$id");

        }


        function sendMessage(){

            //WHATEVER
        }

    if($inclass==='1'){       
        checkCost();        
    }
    else{
        sendMessage();        
    }

}else{

header('location:../login.php');

}
?>

You need to pass the variables as arguments to the function or declare them with global. — Barmar
– Barmar, Commented Sep 11, 2015 at 10:48
Do not use glob to inject global vars into a funciton. In long term this can result very confusing code. — fabpico
– fabpico, Commented Sep 11, 2015 at 10:50
possible duplicate of PHP: variable not working inside of function? — spenibus
– spenibus, Commented Sep 11, 2015 at 11:28

fabpico · Accepted Answer · 2015-09-11 11:25:02Z

0

You can have access to superglobal variables like $_POST in any function. But global variables such as $con that should be initialized in an including file is not accessable in a function. You can pass it as parameter. And do not use the global keyword to inject global vars into a funciton. In long term this can result very confusing code. So you could do:

function checkCost($con){
    $ms_content = $_POST['ms_content'];
    $ms_img = $_POST['ms_img'];
    $ms_prefix = $_POST['ms_prefix'];
    $ms_phone = $_POST['ms_phone'];

        $totalCost = 0;

        if ($ms_img!=""){
                $totalCost=2;
        }   

        else{
                $totalCost=1;
        }

        $checkCredits=mysqli_query($con,"SELECT us_credits FROM ws_users WHERE us_id=$id");


    }

But its still very procedural. I recommend you to start to read OOP.

edited Sep 11, 2015 at 11:25

answered Sep 11, 2015 at 10:48

fabpico

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1 Comment

Biomehanika Over a year ago

I do need OOP, that's for sure. But it is still a bit confusing for me. Thank you for your explanation, worked.

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