Merge multple arrays from one result into a single array in PHP - php

Question

I'm really sorry to bug you, put I've got a problem that I've been trying to resolve for quite some time now. I've done some research and have found things like array_merge but it doesn't appear to help me.
Anyway, enough waffle. I have a result of a query that looks something like this:
Array
(
[0] => STRINGA
)
Array
(
[0] => STRINGA
[1] => STRINGB
)
Array
(
[0] => STRINGA
[1] => STRINGB
[2] => STRINGC
)
Array
(
[0] => STRINGD
[1] => STRINGC
[2] => STRINGA
[3] => STRINGB
[4] => STRINGE
[5] => STRINGF
)
How can I combine the above into one array so that the result will look more like:
Array
(
[0] => STRINGA
[1] => STRINGB
[2] => STRINGC
[3] => STRINGD
[4] => STRINGE
[5] => STRINGF
)
Duplicates in the original arrays can be ignored as I only need the string to be placed into the new array once.
Any help would be massively appreciated.
Thank you.
EDITED: This is the block of code that brings out the result from the database:
while ($row = $result->fetch(PDO::FETCH_ASSOC)) {
foreach($row as $splitrow) {
if(NULL != $splitrow) {
$therow = explode(';',$splitrow);
}
//print_r retrieves result shown above
print_r($therow);
}
}

Answer 1

$bigarray = array(
array (
0 => 'STRINGA',
),
array (
0 => 'STRINGA',
1 => 'STRINGB',
),
array(
0 => 'STRINGA',
1 => 'STRINGB',
2 => 'STRINGC',
)
);
$result = array_values(
array_unique(
array_merge( $bigarray[0], $bigarray[1], $bigarray[2] )
)
);
// array_merge will put all arrays together, including duplicates
// array_unique removes duplicates
// array_values will sort out the indexes in ascending order (1, 2, 3 etc...)

Answer 2

$bigarray = array();
while ($row = $result->fetch(PDO::FETCH_ASSOC)) {
foreach($row as $value){
if($value != NULL){
$therow = explode(';',$value);
foreach($therow as $key=>$values){
//push the value into the single array 'bigarray'
array_push($bigarray, $values);
}
}
}
}
//remove duplicates
$uniquearray = array_unique($bigarray);
//reset key values
$indexedarray = array_values($uniquearray);
print_r($indexedarray);
Thanks to all of those that helped, much appreciated!