http_build_query giving me get parameters of the same name [duplicate] - php

Question

This question already has an answer here:
Build query string with indexed array data
(1 answer)
Closed 7 months ago.
I'm sending multiple parameters to another page, and I am using http_build_query() to do this. The following code:
$array = array();
if(!empty($_POST['modelcheck'])){
foreach($_POST['modelcheck'] as $selected){
$array[] = $selected;
}
}
$args = array
(
'pricefrom' => $fromval,
'priceto' => $toval,
'model' => $array
);
$params = http_build_query($args);
$cleanedParams = preg_replace('/%5B(\d+?)%5D/', '', $params);
header("Location: ../page2.php?" . $cleanedParams);
gives me a url:
page2.php?pricefrom=10000&priceto=60000&model=1&model=2
As you can see model is repeated multiple times, I would like the parameters following the first model to be model2, model3.......etc.
I've tried putting it in a for loop:
for ($i=0; $i <count($array) ; $i++) {
$args = array
(
'pricefrom' => $fromval,
'priceto' => $toval,
'model'.$i => $array
);
}
but this just gives me :
page2.php?pricefrom=10000&priceto=60000&model1=1&model1=2

Answer 1

You can use the second parameter in http_build_query to prefix the numerical keys with a string:
$args = array
(
'pricefrom' => $fromval,
'priceto' => $toval
);
$args += $array; // merge the two arrays together
$params = http_build_query($args, 'model', '&'); // use a second arg for prefix.
However, I do not recommend to create separate names for variables like this. Better to use &model[]=1&model[]=2. See Passing arrays as url parameter

Answer 2

There was nothing wrong with your original code except that you broke it with the call to preg_replace.
if(!empty($_POST['modelcheck'])){
foreach($_POST['modelcheck'] as $selected){
$models[] = $selected;
}
}
$args = [
'pricefrom' => $fromval,
'priceto' => $toval,
'model' => $models,
];
$params = http_build_query($args);
header("Location: ../page2.php?" . $params);
Now, in page2.php you just use $_GET['model'] as an array.
<?php
foreach ($_GET['model'] as $model) {
printf('%s<br/>', $model);
}

Answer 3

Your $args variable should look like:
$args = array (
'pricefrom' => $fromval,
'priceto' => $toval,
'model' => $array
);
UPD
Use preg_replace for replace html special chars if you want to use http_build_query with multiple params.
$query = preg_replace('/%5B(?:[0-9]|[1-9][0-9]+)%5D=/', '[]=', http_build_query($args));
You will receive an array by accessing to $_GET['model']