Setting up array key/value pairs and accessing - php

Question

I have set up an array called $compData by importing data from MySql and pushing two separate arrays called $yearsArray and $salesArray into $compData. Before pushing these two arrays to $compData I have first set their ['name'] to 'Year' and 'Sales', respectively. The code for this is included below.
$sth = mysqli_query($conn, "SELECT * FROM {$tableName} WHERE ID = 'ID_YEAR'");
$yearsArray = array();
$yearsArray['name'] = 'Year';
while($r = mysqli_fetch_array($sth)) {
For ($n = 1; $n <= $CI_YEARS; $n++){
$yearsArray['data'][] = $r["Year$n"];
}
}
$sth = mysqli_query($conn, "SELECT * FROM {$tableName} WHERE ID = 'IS_SALES'");
$salesArray = array();
$salesArray['name'] = 'Sales';
while($rr = mysqli_fetch_assoc($sth)) {
For ($n = 1; $n <= $CI_YEARS; $n++){
$salesArray['data'][] = $rr["Year$n"];
}
}
$compData = array();
array_push($compData,$yearsArray); // 0
array_push($compData,$salesArray); // 1
Now I want to access and echo the data in $compData by using the code below, but this doesn't work. I am not very comfortable with PHP and am wondering if I am not using the ['Year'] and ['Sales'] identifiers correctly. Any help is much appreciated.
foreach($compData['Year'] as $result) {
echo $result, '<br>';
}
foreach($compData['Sales'] as $result) {
echo $result, '<br>';
}

Answer 1

You've set 'Year' as the value of key 'name', but try to use it as key (of another array).
Now you have
echo $compData[0]['name']; // -> 'Year'
echo $compData[1]['name']; // -> 'Sales'
You probably want
$compData = array();
$compData['Year'] = $yearsArray;
$compData['Sales'] = $salesArray;
instead of the array_push..