Get a value from array via a function in PHP

Question

I have a problem in my PHP code. I got an array like this as example ( this array is created dynamic with data from a database).

$db_res =array('debiteur_id'=>'1020','user_id'=>'495','b2b_or_b2c'=>'B2C');

When I show the values with

foreach ($db_res as $key => $value )
{
   echo $key.' - '.$value.' , ';
}

It is displaying these values what is OK

debiteur_id - 1020 , user_id - 495 , b2b_or_b2c - B2C

Now I have a function to test if some data in the array is set or not and to return some values from this $db_res array of $_POST array

    function isnull_post($naam)
    {
        if (isset($db_res[$naam]))
            return($db_res[$naam]);
        else
        {
            if (isset($_POST[$naam]))
                return($_POST[$naam]);
            else
                return('');
        }
    }

When I use the following code to show my array

    foreach ($db_res as $key => $value )
    {
        echo $key.' - '.$value.' , ';
        $val = isnull_post($key);
        echo ('isnull : '.$val.' , ');
    }

This is my output

debiteur_id - 1020 , isnull : , user_id - 495 , isnull : , b2b_or_b2c - B2C , isnull :

What am I doing wrong?

$db_res is not accessible in your function isnull_post you need to pass it along with the key. — Rikesh
– Rikesh, Commented May 1, 2014 at 5:49
or you can use global $db_res; as first line in your function isnull_post — Amit Garg
– Amit Garg, Commented May 1, 2014 at 5:51
What about the $db_res value!? which you have written in the function!? Is it global variable!? Just try to print that value in that function so that you came to know if it will return the value or not!? What array it will print let me know. — Keyur Mistry
– Keyur Mistry, Commented May 1, 2014 at 5:53
Hello Phil, Why not doing what Amit suggested, that is the answer that does what I expected — Sois
– Sois, Commented May 1, 2014 at 6:19

AppleBud · Accepted Answer · 2014-05-01 06:27:07Z

You need to do some changes in isnull_post() function as your $db_res array scope is not global. So make it global in the function where you want to use it as a global variable.

function isnull_post($naam)
    {   
            global $db_res;

            if (isset($db_res[$naam]))
                return($db_res[$naam]);
            else
            {
                if (isset($_POST[$naam]))
                    return($_POST[$naam]);
                else
                    return('');
            }
    }

You can also do it by passing the array to the function as :

 $db_res =array('debiteur_id'=>'1020','user_id'=>'495','b2b_or_b2c'=>'B2C');

    function isnull_post($naam,$db_res)
        {   
            if (isset($db_res[$naam]))
            return($db_res[$naam]);
            else
            {
                if (isset($_POST[$naam]))
                    return($_POST[$naam]);
                else
                    return('');
            }
        }

        foreach ($db_res as $key => $value )
        {   
            $val = isnull_post($key,$db_res);
            echo $key.' - '.$val.' , ';
        }

if your requirement for using this array is only for this function,then you can pass it to the function but if other functions requires this array then you have to define the array global to that function's body scope.

Rahul Kaushik · Accepted Answer · 2014-05-01 05:57:21Z

0

Use Below code:

$db_res =array('debiteur_id'=>'1020','user_id'=>'495','b2b_or_b2c'=>'B2C');
function isnull_post($naam,$db_res)
{   
    if (isset($db_res[$naam]))
    return($db_res[$naam]);
    else
    {
        if (isset($_POST[$naam]))
            return($_POST[$naam]);
        else
            return('');
    }
}

foreach ($db_res as $key => $value )
{   
    $val = isnull_post($key,$db_res);
    echo $key.' - '.$val.' , ';
}

answered May 1, 2014 at 5:57

Rahul Kaushik

1,4648 silver badges16 bronze badges

Comments

GreyRoofPigeon · Accepted Answer · 2014-05-01 05:57:36Z

0

As already is commented, the variable $db_res isn't accessible in your function, you either make it a global (which I don't prefer), or you pass it on, like this:

<?php
    function isnull_post($naam, $db_res)
    {
        if (isset($db_res[$naam]))
            return($db_res[$naam]);
        else
        {
            if (isset($_POST[$naam]))
                return($_POST[$naam]);
            else
                return('');
        }
    }


    foreach ($db_res as $key => $value )
    {
        echo $key.' - '.$value.' , ';
        $val = isnull_post($key, $db_res);
        echo ('isnull : '.$val.' , ');
    }
?>

answered May 1, 2014 at 5:57

GreyRoofPigeon

18.1k5 gold badges39 silver badges60 bronze badges

11 Comments

Avinash Babu Over a year ago

so is $_POST here also an array ??

GreyRoofPigeon Over a year ago

@CodeLover "* $_POST: An associative array of variables passed to the current script via the HTTP POST method. This is a 'superglobal', or automatic global, variable. This simply means that it is available in all scopes throughout a script. There is no need to do global $variable; to access it within functions or methods. " - php.net

Avinash Babu Over a year ago

yes i got that ..but i see like $_post['name'] .but whats the use of $_post[$var] ??...

GreyRoofPigeon Over a year ago

It's bases on the code of the TS, if the function is called like this isnull_post('user_id') the function will first check if $db_res['user_id'] is set, if not it will check if $_POST['user_id'] is set. What the use of this function is, I don't know... that you ask the TS. Is that what you want to know? Or are you pointing on something else?

Avinash Babu Over a year ago

am asking something else ..i just need to know why ($_POST[$naam])) is added here ..

|

Keyur Mistry · Accepted Answer · 2014-05-01 06:00:17Z

You can write any of the way,

        $db_res =array('debiteur_id'=>'1020','user_id'=>'495','b2b_or_b2c'=>'B2C');
        function isnull_post($naam)
        {   
            global $db_res;
            if (isset($db_res[$naam]))
            return($db_res[$naam]);
            else
            {
                if (isset($_POST[$naam]))
                    return($_POST[$naam]);
                else
                    return('');
            }
        }

        foreach ($db_res as $key => $value )
        {   
            $val = isnull_post($key);
            echo $key.' - '.$val.' , ';
        }

Or as the following Steps..

            $db_res =array('debiteur_id'=>'1020','user_id'=>'495','b2b_or_b2c'=>'B2C');
        function isnull_post($naam,$db_res)
        {   
            if (isset($db_res[$naam]))
            return($db_res[$naam]);
            else
            {
                if (isset($_POST[$naam]))
                    return($_POST[$naam]);
                else
                    return('');
            }
        }

        foreach ($db_res as $key => $value )
        {   
            $val = isnull_post($key,$db_res);
            echo $key.' - '.$val.' , ';
        }

But I prefer to use first one.

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