Wrote 2 functions, don't understand what I did wrong - php

Question

I've been practicing PHP more and more and am trying to do functions daily to learn from them.
Yesterday I wrote 2 functions but they completely didn't work and I was looking for help as to why!
My code:
<?php
function getFilesAndContent($path)
{
$data[] = $fileData;
$folderContents = new DirectoryIterator($path);
foreach ($folderContents as $fileInfo) {
if ($fileInfo->isDot()) {
continue;
}
$fileData = [
'file_name' => $fileInfo->getBasename(),
];
if ($fileInfo->getExtension()) {
$fileData['contents'] = getFileContents($fileInfo->getPathname());
}
$data = $fileData;
}
return $data;
}
function getFileContents($path)
{
$names = file_get_contents($fileInfo->getPathname());
$names = implode("\n", $names);
sort($names);
$contents = '';
foreach ($names as $name) {
$contents += $name . ' (' . strlen($name) . ')<br>';
}
return $contents;
}
foreach (getFilesAndContent('.') as $data) {
echo $data['file_name'];
echo '<br>';
echo $data['contents'];
echo '<hr>';
}
DISLCAIMER: I really would like to get these 2 functions to work BUT I already have a working alternative(thank you very much!) without any functions, this is meant as a learning opportunity for myself to improve, any help would be greatly appreciated!

Answer 1

You have several problems.
First, $data = $fileData; should be $data[] = $fileData;. Adding [] means that the assignment creates a new element in the array, rather than overwriting the entire variable. And when you initialize the variable at the beginning of getFilesAndContent, it should be $data = [];.
Second, file_get_contents($fileInfo->getPathname()) should be file_get_contents($path). $fileInfo is a variable in getFilesAndContent, not getFileContents.
Third, implode() should be explode(). implode joins an array to create a string, explode() splits up a string into an array.
function getFilesAndContent($path)
{
$data = [];
$folderContents = new DirectoryIterator($path);
foreach ($folderContents as $fileInfo) {
if ($fileInfo->isDot()) {
continue;
}
$fileData = ['file_name' => $fileInfo->getBasename(),];
if ($fileInfo->getExtension()) {
$fileData['contents'] = getFileContents($fileInfo->getPathname());
}
$data[] = $fileData;
}
return $data;
}
function getFileContents($path)
{
$names = file_get_contents($path);
$names = explode("\n", $names);
sort($names);
$contents = '';
foreach ($names as $name) {
$contents += $name . ' (' . strlen($name) . ')<br>';
}
return $contents;
}
foreach (getFilesAndContent('.') as $data) {
echo $data['file_name'];
echo '<br>';
echo $data['contents'];
echo '<hr>';
}