CODEWITHSUNDEEP
phpwordpress
Bruno Andrade
Bruno Andrade

Reputation: 595

How to pass values between functions

I know it would be easy using methods and attributes, but I can not just do it with functions. It's for a wordpress plugin so I also can not use global variables.

I would like to know how to pass the GET value of the Post() function to Funend (). My unsuccessful attempt:

<?php
//FUNCTION 1
function Name($a)
{


    return $a;  
}

//FUNCTION 2

function Post()
{
    $city = $_GET['city'];

    Name($city);

}

//FUNCTION 3
function Funend()
{

    $funend = Name();

        ///DEBUG
        ob_start(); 
        var_dump($funend);
        $data = ob_get_clean();
        $txt = fopen('bug.txt', 'a');
        fwrite($txt,  $data);
        fclose($txt);
        //DEBUG 
}
Post();
Funend();

Upvotes: 0

Views: 67

Answers (2)

Gyandeep Sharma
Gyandeep Sharma

Reputation: 2327

First of all - Functions always in small letters.

If you just wants to pass $_GET value to Funend() you can pass it like this

<?php
    //FUNCTION 1
    function Name($a){
        Funend($a);//Calling Funend()function
    }
    //FUNCTION 2
    function Post(){
        Name($_GET['city']); //Calling Name()function
    }
    //FUNCTION 3
    function Funend($city){
        ///DEBUG
        ob_start(); 
        var_dump($city);
        $data = ob_get_clean();
        $txt = fopen('bug.txt', 'a');
        fwrite($txt,  $data);
        fclose($txt);
        //DEBUG 
    }
    Post(); //Calling Post()function
?>

Upvotes: 1

Decent Dabbler
Decent Dabbler

Reputation: 22783

Functions can accept values (called arguments or parameters) and they can return values (simply called return value).

If the objective is to let Funend() receive a value from Post(), you could do this:

function Post() {
    return $_GET[ 'city' ]; // return value
}

// accepts one (explicit) argument
function Funend( $city ) {
    /* do something with $city */
}

Funend( Post() );

That last line is basically a condensed version of:

$city = Post(); // temporarily store the return value of Post() in $city;
Funend( $city ); // pass $city as an argument to Funend();

except it doesn't use the intermediate variable $city, thereby keeping the outer scope clean of variables.

Another way to do it could be:

function Post() {
    $city = $_GET[ 'city' ];

    Funend( $city ); // call Funend() from within Post()

    return $city; // perhaps return the city as well?
}

function Funend( $city ) {
    /* do something with $city */
}

Post(); // now we only have to call Post()

But then Post() is coupled to Funend(), which makes it less flexible, because now you can't call Post() anymore without automatically invoking Funend() as well.

Upvotes: 2

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