How to create and keep variables in a for-loop using arrays?

Question

I've been trying to work with two for-loops to iterate through a multidimensional array and to assign the values to individual variables. However, it doesn't work, because it seems that I can't get the variables assigned to the data.

    $onepage = array
  (
  array("navbar",22,28,23,25), 
  array("presentation",15,13,23,23), 
  array("content",5,2,13,10), 
  array("footer",17,15,23,26) 
  );

      function presetter($selection) { //selection = onepage
          for($n=0;$n<=3;$n++){
              for($i=1;$i<=4;$i++){

                        $rwcl =  $selection[$n][0];
                        $numb = $i -1;
                        ${$rwcl . $numb} = $selection[$n][$i]; //outputs navbar1 
                        $l = $rwcl . $numb;
                        $$l = $selection[$n][$i];

                        echo ${$rwcl . $numb}; //outputs variable navbarx


                        echo $rwcl;//output column name

                        echo $selection[$n][$i];
                        echo "<br>";
              }
          }

      } //<-- works!

      presetter($onepage);
echo $navbar1;

The output is always Type 8 - undefined variable. I've tried several options, also the proposed solution here: PHP: Create Unique Variables In A For Loop, but without a positive result.

Probably some will say that what I do is not the sense of arrays. And yes, you are right. But would like solve it.

Maybe somebody knows how to get it done. Thanks in advance.

Clyff · Accepted Answer · 2017-02-04 13:17:30Z

0

You are creating statics variables inside you function. When the function is done, the variables will be useless.

If you want to use them outside your function, you should create global variables or make this function return an output with all variables created (maybe an array?).

Here is a example of a global variable inside a function:

<?php
    function printIt() {
        global $x;
        $x = array(1,2,3);
    }

    printIt();
    var_dump($x);

You can read more about it here

answered Feb 4, 2017 at 13:17

Clyff

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2 Comments

nucky Over a year ago

It works, Clyff. Thank you very much. As it should. I'd like to upvote your answer, but unfortunately my account is too young. So thanks again.

Clyff Over a year ago

No worries, I'm glad to help :)

Kirtee · Accepted Answer · 2017-02-04 14:06:40Z

0

you are creating variables inside a function that is why there are not accessible outside a function. You need to create global variables to access them. Here is the code

$onepage = array
(
array("navbar", 22, 28, 23, 25),
array("presentation", 15, 13, 23, 23),
array("content", 5, 2, 13, 10),
array("footer", 17, 15, 23, 26));

function presetter($selection) { //selection = onepage
for ($n = 0; $n <= 3; $n++) {
    for ($i = 1; $i <= 4; $i++) {

        $rwcl = $selection[$n][0];
        $numb = $i - 1;
        $var = $rwcl . $numb;
        global $$var;
        $$var = $selection[$n][$i]; //outputs navbar1 
    }
}}
presetter($onepage);echo $navbar1;

answered Feb 4, 2017 at 14:06

Kirtee

1519 bronze badges

1 Comment

nucky Over a year ago

Like Clyff's answer, works well. Thank you, Kittu. :-)

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