How do i create an array from form input - php

Question

I'm trying to write a php script that takes the input from this form and creates an array with a unique key for each input box/text boxes content.
<div class="container">
<div class="row">
<div class="col-3 mx-auto">
<form action="adminhandler.php">
<div class="form-group">
<label for="product name">Enter product name</label>
<input type="text" class="form-control" id="productName" aria-describedby="emailHelp" placeholder="" name="productname">
</div>
<div class="form-group">
<label for="product name">Select product category</label>
<select name="select" class=" custom-select">
<option selected>Open this select menu</option>
<option value="1">Formal Shoes</option>
<option value="2">Sneakers</option>
<option value="3">Tracksuits</option>
<option value="3">Clothing</option>
<option value="3">Accessories</option>
</select>
</div>
<div class="form-group">
<label for="product price">Enter product price(Naira)</label>
<input type="text" class="form-control" id="productPrice" aria-describedby="emailHelp" placeholder="" name="price">
</div>
<div class="form-group">
<label for="product name">Select image</label>
<input type="file" class="form-control-file" id="productimage" aria-describedby="emailHelp" placeholder="">
</div>
<button type="submit" class="btn btn-primary">Submit</button>
</form>
</div>
</div>
</div>

Answer 1

I think you want to use a form as an array and then pass the same data as an array.If you are using the $_POST, you will need to use the name attribute of HTML. And use something like this :
<input name="person[1][first_name]" value="jane" />
This when passing through PHP will be sent as Array.
Here is the reference :
http://php.net/manual/en/reserved.variables.post.php
An Excerpt from one of the contributors :
<form>
<input name="person[0][first_name]" value="john" />
<input name="person[0][last_name]" value="smith" />
<input name="person[1][first_name]" value="jane" />
<input name="person[1][last_name]" value="jones" />
</form>
When Trying To Process Values using PHP
<?php
var_dump($_POST['person']);
//will get you something like:
array (
0 => array('first_name'=>'john','last_name'=>'smith'),
1 => array('first_name'=>'jane','last_name'=>'jones'),
)
?>