$_GET method inside a while loop - php

Question

Hi I am trying create a system for making my own invoices, and printing them, so I created inputs with a while loop, depending on the number of articles I have entered, using the code below
<?php
$cont=1;
$numero = $_REQUEST['numeroa'];
while($cont<=$numero) {
echo $cont;
echo " <input class='Descripcion$cont' placeholder='Descripcion :' />";
echo " <input class='Precio' name='precio$cont' placeholder='Precio :' onkeyup='AddInputs()' /><br>";
$cont++;
}
echo "<textarea name='comment' >Escriba sus comentarios....</textarea>";
session_start();
$_SESSION['cont']=$cont;
?>
This sends post info to another php page, so I get something like this on the url
http://localhost/pruebas/facturapdf.php?precio1=1&precio2=2&precio3=3&precio4=4&precio5=5
I tried to get the variables using this code but I had no success
session_start();
$contp=$_SESSION['cont'];
while($cont<=$contp) {
$articulos[$cont]=$_GET['precio$cont'];
echo $articulos[$cont];
$cont++;
}
Is there a way I can use the get method changing the number each loop??
If there isn't, how can I get all the variables, knowing they are different every time, depending on the user input
thanks in advance..

Answer 1

As already mentioned, you're using single quotes for when you should be using double..
$articulos[$cont] = $_GET["precio$cont"];
Further, you could actually pass in an array directly as query data rather than appending a count value and looping through them.
echo " <input class='Descripcion' placeholder='Descripcion :' />";
echo " <input class='Precio' name='precio[]' placeholder='Precio :' onkeyup='AddInputs()' /><br>";
Note that I've simply changed name='precio$cont' to name='precio[]'
you can then access this as an array when submitted
$precioArr = $_GET['precio'];
Just to demostrate
for($i = 0; $i < count($precioArr); $i++) {
echo $precioArr[$i];
}
So you could actually use this for the requirements that you mentioned
If there isn't, how can I get all the variables, knowing they are different every time, depending on the user input
This can be demonstrated using this code
<?php
echo "query data:<br>";
print_r($_GET['array']);
echo "<br>";
echo "query keys:<br>";
print_r(array_keys($_GET['array']));
?>
So if you had a form like so:
<form action="demo.php" method="GET">
<input name="array[2]" type="text" value="11">
<input name="array[4]" type="text" value="11">
<input name="submit" type="submit" value="Submit">
</form>
This would pass a query query of ?array[2]=11&array[4]=11, the result you'd get is:
query data:
Array ( [2] => 11 [4] => 11 )
query keys:
Array ( [0] => 2 [1] => 4 )

Answer 2

try:
<?php
session_start();
$contp=$_SESSION['cont'];
while($cont<=$contp) {
$articulos[$cont]=$_GET['precio'. $cont];
echo $articulos[$cont];
$cont++;
}
difference to the original: 'precio'. $cont
this will concat the value of the variable $cont to the string literal 'precio'.
what you wrote ('precio$cont') will always be the literal string it is. no variable used.