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I have a standard data like this:

+------------+----------+-------+

| name       | position | width |

+------------+----------+-------+

| REFERENCE  |       20 |     9 |

| TRNSXN     |       48 |    14 |

| ESTIM_DATE |       64 |     8 |

+------------+----------+-------+

3 rows in set (0.00 sec)

My goal is to create a string where I can define the position and the width of each element, something like this

                   ETL                         E7954           20181123

As you can see
first string is REFERENCE = "ETL"; starts on 20 and has a maximum 9 characters. if it has less, put space at the rest.

Then second string is TRNSXN = E7954; is start on 48 and have maximum 14 characters, if it has less, put space at the rest. So on, so on.

So far, this is my code:

private function preFormattedText($string, $width)

{

    return str_pad($string, $width, " ", STR_PAD_RIGHT);

}



public function actionHermesAnsi($id)

{

    $modelWestims =getDataAsAboveDescription ;





    $stringWestim = null;

    $stringWestim .= $this->preFormattedText('ETL', (int)$modelWestims[0]['width']);

    $stringWestim .= $this->preFormattedText('E7954', (int)$modelWestims[1]['width']);



    header("Content-type: text/plain");

    header("Content-Disposition: attachment; filename=westim.txt");



    print $stringWestim;

    exit();

}

I got ETL E7954
I can not define the position of it. Please help.

Something like this will do what you want:

function formatStrings($strings, $positions) {

    $position = 0;

    foreach ($strings as $key => $str) {

        // do we need to move to a new position to display the next string?

        if ($positions[$key]['position'] > $position) {

            echo str_pad('', $positions[$key]['position'] - $position - 1);

            $position = $positions[$key]['position'];

        }

        // display the string

        echo str_pad($str, $positions[$key]['width']);

        $position += $positions[$key]['width'] - 1;

    }

}



$strings = array('ETL','E7954','20181123');

$positions = array(array('position' => 20, 'width' => 9),

                   array('position' => 48, 'width' => 14),

                   array('position' => 64, 'width' => 8));

echo formatStrings($strings, $positions);

Demo on 3v4l.org

Maybe you can use STR_PAD_LEFT with the position like you did with the width, and remove the length of $stringWestim :

private function preFormattedText($stringWestim, $string, $width, $position)

{

    $string = str_pad($string, $position - strlen($stringWestim), " ", STR_PAD_LEFT );

    return str_pad($string, $width, " ", STR_PAD_RIGHT);

}

Thanks for @Nesku and @Nick.

I use Nick's answer, a little modification based my needs like this:

private function formatStrings($strings, $positions)

{

    $position = 0;

    $returnString = null;

    foreach ($strings as $key => $str) {

        // do we need to move to a new position to display the next string?

        if ($positions[$key]['position'] > $position) {

            $returnString .= str_pad('', $positions[$key]['position'] - $position - 1);

            $position = $positions[$key]['position'];

        }

        // display the string

        $returnString .= str_pad($str, $positions[$key]['width']);

        $position += $positions[$key]['width'] - 1;

    }



    return $returnString;

}