How to deal with value attribute if the name attribute is an array in PHP and HTML

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What I need to do is, if the user submits the form and there are blank inputs, the value of entered inputs will be retrieved. It is working fine if the name attribute is not an array, I tried the same thing here where the name attribute is an array, but it didn't work... This is the PHP code:

PHP

<?php
if(isset($_GET['add']){
$qp = ((isset($_POST['qp']) && $_POST['qp'] != '')?$_POST['qp']:'');
}
?>

and here is the HTML code:

PHP

<input name="qp[]" value="<?=$qp;?>" class="form-control">

I've got an error inside the input when submitting the form: "Warning: Array to string conversion"
Is the PHP code above is correct? How can I do it?

What I have tried:

I've also tried this:

PHP

<input name="qp[]" value="<?=$qp[];?>" class="form-control">

It says: Fatal error: Cannot use [] for reading

Posted 9-Apr-22 4:41am

FRS4002

Updated 9-Apr-22 5:12am

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Richard MacCutchan · Answer 1 · 2022-04-09T05:12:00

Solution 1

As I mentioned in your question at Check if the field is empty and the name is array in PHP[^], names must not include square brackets.

Posted 9-Apr-22 5:12am

Richard MacCutchan

Comments

FRS4002 9-Apr-22 11:25am

Then how can I send array values ??

Richard MacCutchan 9-Apr-22 11:40am

You have to send them as separate items (see HTML Input Types[^]), which you unpack in the PHP code.

FRS4002 9-Apr-22 11:43am

But I am using for loop, separate items means a lot of code to be done + not efficient

Richard MacCutchan 9-Apr-22 12:00pm

You can only work with what is available.