PHP - Passing String Through A Function Using Return

Hi! So what I'm trying to do is split a multi dimensional array of strings ( each containing 3 strings inside of 1 array ) so I can write the results to a file.

So say I had a bunch of strings inside 1 array : 

class File {
    function WriteFile ( $filename, $content ) {
        $list = [
            $content
        ];
        $delimiters = File :: checkDelimiter (
            $content, 
            true, 
            false
        );
        $fp = fopen (
            $filename, 'w'
        );
        foreach ( $list as $fields ) {
            $fields = File :: SplitFileByDelimiter (
                $fields, 
                ",", 
                3
            );
            file_put_contents (
                $filename, $fields
            );
        }
        fclose ( $fp );
    }
}

$file-> File :: WriteFile (
    $filepath . $filename, 
    "TEST!, TEST!, TEST!, " . 
    "TEST!, TEST!, TEST!, " . 
    "TEST!, TEST!, TEST!"
);
	

Instead of writing : 

TEST!, TEST!, TEST!, TEST!, TEST!, TEST!, TEST! ,TEST!, TEST!, TEST!
	

to the file in a straight line, it should write it like this : 

TEST!, TEST!, TEST!, 
TEST!, TEST!, TEST!, 
TEST!, TEST!, TEST!
	

Any help is ABSOLUTELY appreciated!

Hi there

I have started using php excell and getting most of it right. 

But i am struggling to search active sheet and return what cell the string is in. below is my code.

<?php
ini_set('display_errors', 1);
ini_set('display_startup_errors', 1);
error_reporting(E_ALL);
set_time_limit(0);



$directory = "/var/www/html/csvex/xls/";
$formatdirectory = "/var/www/html/csvex/toformat/";
$finishedformatdirectory = "/var/www/html/csvex/formatted/";
$savanadirectory = "/var/www/html/iretire/files/upload/1/";
$main = "/var/www/html/csvex/";


$files = scandir($directory, SCANDIR_SORT_DESCENDING);

$newest_file = $files[0];
echo $newest_file;
echo "<br>";
$oldfile = $directory.$newest_file;
$newfile = $formatdirectory.$newest_file;
$changedfile = $finishedformatdirectory.$newest_file;
$crmfile = $savanadirectory.$newest_file;
echo $oldfile;
echo "<br>";
echo $newfile;

echo "<br>";
if( !rename($oldfile, $newfile) ) {  
    echo "File can't be moved!";  
}  
else {  
    echo "File has been moved!";  
} 
//format the file


date_default_timezone_set('Europe/London');
set_include_path(get_include_path() . PATH_SEPARATOR . './Classes/');

include 'PHPExcel/IOFactory.php';

$fileType = 'Excel5';
$fileName = $newfile;

// Read the file
$objReader = PHPExcel_IOFactory::createReader($fileType);
$objPHPExcel = $objReader->load($fileName);
//change font
$objPHPExcel->getActiveSheet()->getStyle('a1:a6')->applyFromArray(
$styleArray = array(
'font' => array(
'bold' => true
)
)
);
$objPHPExcel->getActiveSheet()->getStyle('a6:aa6')->applyFromArray(
$styleArray = array(
'font' => array(
'bold' => true
)
)
);
$objPHPExcel->getActiveSheet()->getStyle('n16:aa16')->applyFromArray(
$styleArray = array(
'font' => array(
'bold' => true
)
)
);
//get INACTIVE MEMBERS
$foundInCells = array();
$searchValue = 'INACTIVE MEMBERS';
foreach ($objPHPExcel->getActiveSheet() as $worksheet) {
    $ws = $worksheet->getTitle();
    foreach ($worksheet->getRowIterator() as $row) {
        $cellIterator = $row->getCellIterator();
        $cellIterator->setIterateOnlyExistingCells(true);
        foreach ($cellIterator as $cell) {
            if ($cell->getValue() == $searchValue) {
                $foundInCells[] = $ws . '!' . $cell->getCoordinate();
            }
        }
    }
}
echo "<br>";
echo "<br>";
echo "this is where - - ";
var_dump($foundInCells);
echo "<br>";
echo "<br>";
//
$objPHPExcel->getActiveSheet()->getStyle('a20')->applyFromArray(
$styleArray = array(
'font' => array(
'bold' => true
)
)
);

its located at //Get inactive members.

another one i am struggling with is to see if file exists if not then do nothing if it does run the code.

if(isset($_POST['boards']))
	$boards[] = $_POST['boards'];
$allboards = implode("",$boards[0]);
echo $allboards;