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Daniel Rivas
Asked: 2022-05-02 09:09:24 +0800 CST 2022-05-02 09:09:24 +0800 CST

How to temporarily preserve data in an array?

  • 772

I am trying to store data from a form in a PHP array, I send the data by the "POST" method but I need it to store more data or products with their respective positions, my code is as follows:

<?php

                $sProducto = $_POST["producto"];
                $sCantidadExistencia = $_POST["cantidad"];
                $sPrecio = $_POST["precioventa"];
                $sCantidadProducto = $_POST["cantidad"];

                $total = $sCantidadProducto * $sPrecio;

                $i = 0;

                for ($i=0; $i<50; $i++)
                {
                    $factura = array($sProducto, $sCantidadExistencia, $sPrecio, $sCantidadProducto, $total);
                }                                                  

                print_r($factura);

                ?>

And the result it gives me is the following: Array ( [0] => Pasta INA [1] => 2 [2] => 11.00 [3] => 2 [4] => 22 ) and if I try to save another product, it changes it and does not save another, example of a new product entered: Array ( [0] => Cepillo de Dientes [1] => 2 [2] => 5.00 [3] => 2 [4] => 10 )

The form must be sent several times and must remember previous products, in addition, I tried to use the cycle forto do what I indicate, remember the products.

I would appreciate the support, greetings!

php

3 Answers

  1. Best Answer

    I can think of two ways to do it server-side:

    1. Saving the data in a table.
    2. Saving the data in the session ($_SESSION).

    Research the pros and cons of each of them. The simplest, not necessarily the best, is 2.

    <?php

$sProducto = $_POST["producto"];
$sCantidadExistencia = $_POST["cantidad"];
$sPrecio = $_POST["precioventa"];
$sCantidadProducto = $_POST["cantidad"];

$total = $sCantidadProducto * $sPrecio;

// Este if es probable que no lo necesite, pues en este punto, teniendo 
// a un usuario en el sistema, seguro hay una sesión activa 
if (!isset($_SESSION)) {
    session_start();
}

// Si ya se envió el formulario al menos una vez, debe existir la factura
// en la sesión, la recuperamos entonces.
if (isset($_SESSION['factura'])) {
    $factura = $_SESSION['factura'];
}

// Adicionar el nuevo producto
$factura[] = array($sProducto, $sCantidadExistencia, $sPrecio, $sCantidadProducto, $total);

// Sobrescribir la factura con la actualizada
// Si es la primera ejecución se crea la variable
$_SESSION['factura'] = $factura;

print_r($factura);

    Then in the final code (which you mentioned in a comment) consider "cleaning" the invoice stored in the session, because if the user starts a new purchase process (I guess that's what it is) the data from the previous process will be remain present on the new invoice.

    • 3

  2. Dude adding [] to the end of your variable turns it into an array accessible via its index.

    <?php
    for ($i=0; $i<50; $i++){
     $factura[] = array($sProducto, $sCantidadExistencia, 
     $sPrecio,$sCantidadProducto, $total);
     
    }
    //Luego accedes a factura por indice
    print_r($factura[0]) //Posicion 0
    print_r($factura[1]) //Posicion 1
    //Y así con todas la posiciones
?>
    • 2

  3. The way to have persistence of the information is through cookies, this can be achieved in the following way.

    <?php

    $factura = [];
    if(isset($_COOKIE['productos'])){ // verifico que cookie exista
        $factura = json_decode($_COOKIE['productos']);
    }
    $sProducto = 1;
    $sCantidadExistencia = 2;
    $sPrecio = 3;
    $sCantidadProducto = 4;
    $factura[] = array($sProducto, $sCantidadExistencia, $sPrecio, $sCantidadProducto);
    setcookie('productos', json_encode($factura), time() + (86400 * 30), "/");

    First I check if the cookie was created, if it exists, I get the information and convert it into an array (the cookie only stores String) and I assign it to the variable that will store the following data

    or you can also use sessions they work the same as cookies.

    <?php
    session_start();

    $factura = [];
    if(isset($_SESSION['productos'])){ // la cookie existe
        $factura = json_decode($_SESSION['productos']);
    }
    $sProducto = 1;
    $sCantidadExistencia = 2;
    $sPrecio = 3;
    $sCantidadProducto = 4;
    $factura[] = array($sProducto, $sCantidadExistencia, $sPrecio, $sCantidadProducto);
    $_SESSION['productos'] = json_encode($factura);
    • 2