PHP Array adding to array

I have a function that creates arrays and then I want to add to a main master array that I can then json_encode...

So the code

$pathtocsvs = "/var/www/csvfiless/";
$mainarray= array();

$filearray = getDirectoryList($pathtocsvs);
sort($filearray);

foreach ($filearray as $v) {
    parseCSV($pathtocsvs. $v);;   
}

print_r(json_encode($mainarray)); //outputs not开发者_StackOverflowhing but an empty [] json string

And the parseCSV function, I have removed some of the irrelavent code.

function parseCSV($file){

$file_handle = fopen($file, "r");
$output = "";

$locations = array(); 

while (!feof($file_handle) ) {
    $line_of_text = fgetcsv($file_handle, 1024);

    $lat = $line_of_text[0];
    $lon = $line_of_text[1];
    $output =  $lat.",". $lon ;

    array_push($locations,$output);

}

array_push($mainarray,$locations);   //line 47 that is the error
print_r($locations);  //This does display the array
print_r($mainarray);  //This displays nothing

fclose($file_handle);

}

And this error appears in the log...

array_push() expects parameter 1 to be array, null given in /var/www/test.php on line 47

Fix parseCSV function: replace

$output = "";

to

$output = array();

and after

fclose($file_handle);

add

return $output;

Then change the block in code like this:

foreach ($filearray as $v) {
    $mainarray[] = parseCSV($pathtocsvs. $v);
}

2 problems that I can see... you've declared $mainarray outside the function, so to access it, you'll need to use globals. Secondly, to concat two arrays, you need to use array_merge.

function parseCSV($file){
    globals $mainarray;
    $file_handle = fopen($file, "r");
    $output = "";

    $locations = array(); 

    while (!feof($file_handle) ) {
        $line_of_text = fgetcsv($file_handle, 1024);

        $lat = $line_of_text[0];
        $lon = $line_of_text[1];
        $output =  $lat.",". $lon ;

        array_push($locations,$output);

    }

    $mainarray = array_merge($mainarray,$locations);
    print_r($locations);  //This does display the array
    print_r($mainarray);  //This displays nothing

    fclose($file_handle);
}