php: how to change array value (text) - php

Question

I'm trying to change value in my array but can't for some reason...
`
My code:
<form action="index.php" method="POST" class="form-control">
<label for="soortMeel">Soort meel:</label>
<input type="text" name="soortMeel" id="soortMeel">
<label for="vorm">Soort vorm:</label>
<input type="text" name="vorm" id="vorm">
<label for="gewicht">gewicht:</label>
<input type="number" name="gewicht" id="gewicht">
<label for="gewicht">row aanpassen:</label>
<input type="number" name="arr_input" id="arr_input">
<div>
<input type="submit" name="add" value="add">
<input type="submit" name="update" value="update">
</div>
</form>
<?php
class brood {
public $soort_meel;
public $vorm_brood;
public $gewicht;
function __construct($soort_meel, $vorm_brood, $gewicht) {
$this->soort_meel = $soort_meel;
$this->vorm_brood = $vorm_brood;
$this->gewicht = $gewicht;
}
function getGewicht() {
return $this->gewicht;
}
function setGewicht($gewicht) {
$this->gewicht = $gewicht;
}
function getVorm_brood() {
return $this->vorm_brood;
}
function setVorm_brood($vorm_brood) {
$this->vorm_brood = $vorm_brood;
}
function getSoort_meel() {
return $this->soort_meel;
}
function setSoort_meel($soort_meel) {
$this->soort_meel = $soort_meel;
}
}
$soort_meel = isset($_POST['soortMeel']) && !empty($_POST['soortMeel']) ? $_POST['soortMeel'] : null;
$vorm_brood = isset($_POST['vorm']) && !empty($_POST['vorm']) ? $_POST['vorm'] : null;
$gewicht = isset($_POST['gewicht']) && !empty($_POST['gewicht']) ? $_POST['gewicht'] : null;
$arr_input = isset($_POST['update']) && !empty($_POST['update']) ? $_POST['update'] : null;
// if(isset($_SESSION['update'])) {
// $arr_input = $_SESSION['update'];
// } else {
// $brood_winkel['soort_meel'] = $soort_meel;
// }
if(isset($_SESSION['brood_winkel'])) {
$brood_winkel = $_SESSION['brood_winkel'];
} else {
$brood_winkel = array(
new brood("volkorenmeel", "volkorenbrood", "35 gram")
);
}
// ADD NEW BROOD
if ($soort_meel != null && $vorm_brood != null && $gewicht != null) {
array_push($brood_winkel, new brood($soort_meel, $vorm_brood, $gewicht));
}
foreach($brood_winkel as $newbrood) {
echo "<table>";
echo "<tr>";
echo "<th>" . $newbrood->getSoort_meel() . "</th>";
echo "<th>" . $newbrood->getVorm_brood() . "</th>";
echo "<th>" . $newbrood->getGewicht() . "</th>";
echo "</tr>";
echo "</table>";
}
$_SESSION['brood_winkel'] = $brood_winkel;
$_SESSION['update'] = $arr_input;
echo $brood_winkel[0];
?>
</body>
</html>
`
trying to echo array but doesn't work:
echo $brood_winkel[0];
Fatal error: Uncaught Error: Cannot use object of type brood as array
in index.php on line 148
Error: Cannot use object of type brood as array in
index.php on line 148
All i want is to set new value in the targetted index of the array.
(if something is not good explained ask them please).

Answer 1

As the error-message already mentions, you can't print a complete object or array with echo. For these cases always use print_r or var_dump.
var_dump($brood_winkel[0]);
print_r($brood_winkel[0]);
You can use echo, if you want to print out single values. In your case this could be one or multiple attribute values:
echo $brood_winkel[0]->getGewicht();
Also, I wanted to add that since all your object-attributes are public you actually don't need your getter-Functions. You can simply access them like this:
echo $brood_winkel[0]->gewicht;
This is also the same way how you can update single values of this object:
$brood_winkel[0]->gewicht = 2;
Of course you can also replace the complete object at the index of that array:
$test_brood = new brood("meel", "brood", "40");
$brood_winkel[0] = $test_brood;
I hope I could help you. Keep it up!