html form inputs array PHP - php

Question

I have a problem with my cloned form:
The form has 4 inputs and I need to separate the variables and put them together by people.
My inputs:
<input type="text" name="fName[]">
<input type="text" name="lName[]">
<input type="number" name="age[]">
<input type="text" name="city[]">
My PHP:
$fNameArray = $_POST['fName'];
$lNameArray = $_POST['lName'];
$ageArray = $_POST['age'];
$cityArray = $_POST['city'];
I really do not understand how two-dimensional arrays work, to group people to complete the form, as in the following example:
first name: siddharta, last name: naranjo, age: 29, city: mexico
first name: xxxxx, last name: xxxxxx, age: xx, city: xxxx.

Answer 1

Some of these answers are wrong if I understand you.
First of all if you use the naming convention data[]fname then it will not group surely?
Secondly, the blank bracket will have it constantly move to a new array.
You will end up with a load of arrays with one element in them.
You will need to number or ID the arrays to keep them together.
<?php
if(isset($_POST['data'])){
$results = $_POST['data'];
echo "<pre>";
print_r($results);
echo "<pre>";
}
?>
<form action="" method="post">
<!-- User 1 -->
<input type="text" name="data[0][fName]" value="test 1">
<input type="text" name="data[0][lName]" value="test 1">
<input type="number" name="data[0][age]" value="21">
<input type="text" name="data[0][city]" value="test 1">
<br>
<!-- User 2 -->
<input type="text" name="data[1][fName]" value="test 2">
<input type="text" name="data[1][lName]" value="test 2">
<input type="number" name="data[1][age]" value="22">
<input type="text" name="data[1][city]" value="test 2">
<br>
<!-- User 3 -->
<input type="text" name="data[2][fName]" value="test 3">
<input type="text" name="data[2][lName]" value="test 3">
<input type="number" name="data[2][age]" value="23">
<input type="text" name="data[2][city]" value="test 3">
<br>
<input type="submit" value="Go">
</form>
This produces this:
Array
(
[0] => Array
(
[fName] => test 1
[lName] => test 1
[age] => 21
[city] => test 1
)
[1] => Array
(
[fName] => test 2
[lName] => test 2
[age] => 22
[city] => test 2
)
[2] => Array
(
[fName] => test 3
[lName] => test 3
[age] => 23
[city] => test 3
)
)
Which is what it looks like you want?

Answer 2

Your html is ok
If i understand you right take a look at this
<?php
if($_POST && isset($_POST['fName'])) {
$people = count($_POST['fName']);
for($i=0; $i<$people; $i++) {
echo "<p>first name: {$_POST['fName'][$i]}, last name: {$_POST['lName'][$i]} ...</p>";
}
}

Answer 3

Use keys for 2 dimensional array.
<input type="text" name="fName[0]">
<input type="text" name="lName[0]">
<input type="number" name="age[0]">
<input type="text" name="city[0]">
<input type="text" name="fName[1]">
<input type="text" name="lName[1]">
<input type="number" name="age[1]">
<input type="text" name="city[1]">