Declare php variables by for loop in array - php

Question

How to declare variables in the array using for loop. I have 3 input fields on my page, so when the submit buttons is pressed, it should process the following line of code. On my html page, there are fields named: question1, question2, and question3.
Here's the code of process.php file. It doesn't work for some reason, I suppose there are several mistakes here but I cannot find em.
<?php
$question = array();
for($j=1; $j<4; $j++) {
$question[j] = $_POST['question[j]'];
$result;
$n=1;
if($question[j] != "") {
$result = $n.'): '.$question[j].'<br/><br/>';
$n++;
}
}
echo $result;
?>

Answer 1

<?php
$question = array();
$result = "";
for($j=1; $j<4; j++) {
$question[$j] = $_POST["question$j"];
if($question[$j] != "") {
$result .= $j.'): '.htmlentities($question[$j]).'<br/><br/>';
}
}
echo $result;
?>
Though you don't need an array.
<?php
$result = "";
for($j=1; $j<4; j++) {
$result .= $_POST["question$j"]!="" ? htmlentities($_POST["question$j"]).'<br/><br/>':'';
}
echo $result;
?>

Answer 2

For starters, arrays are zero-indexed, so I think you want this:
for($j=0; $j<3; j++)
Aside form that, this doesn't evaluate the value of j:
$_POST['question[j]']
I think you might want something like this:
$_POST["question$j"]
However, if you made the indexing change above, since your elements are named starting with 1 instead of 0 then you'd need to account for that:
$_POST['question' . $j+1]

Answer 3

You can use following HTML code
<input type="text" name="question[a]" />
<input type="text" name="question[b]" />
<input type="text" name="question[c]" />
with following PHP code:
foreach($_POST["question"] as $key => $value)
{
// $key == "a", "b" or "c"
// $value == field values
}
Remember to sanitize Your input!