Cannot redeclare App\funtion_name() - php

Question

I have a function
function getImg($img,$str,$input){
// dd($img);
$img_path = public_path().'/images/photos/devices/'.$img.'.jpg';
if(file_exists($img_path)){
if(strpos($input,$str)){
return $img;
}else{
return 'no-img';
}
}else{
return 'no-img';
}
}
Then, I call it like this
getImg('phone','phone',$input);
Why do I keep getting this error ?
Cannot redeclare App\getImg()
The whole function
public static function img($input){
$img_path = public_path().'/images/photos/devices/';
$images = scandir($img_path, 1);
$devices = [];
foreach($images as $i=>$image){
if($image != '.' && $image != '..' && $image != '.DS_Store'){
$name = str_replace('.jpg', '', $image);
$devices[$i]['name'] = $name;
}
}
// dd($devices);
// dd($input);
foreach ($devices as $i=>$device) {
$matches = array_filter($devices, function($device) use ($input) {
return strpos($input, $device['name']) !== FALSE;
});
if(count($matches) > 0){
foreach ($matches as $match) {
$input = $match['name'];
$img_path = public_path().'/images/photos/devices/'.$input.'.jpg';
if(file_exists($img_path)){
return $input;
}else{
return 'no-img';
}
}
}else{
// dd($input);
function getImg($img,$str,$input){
// dd($img);
$img_path = public_path().'/images/photos/devices/'.$img.'.jpg';
if(file_exists($img_path)){
if(strpos($input,$str)){
return $img;
}else{
return 'no-img';
}
}else{
return 'no-img';
}
}
getImg('phone','phone',$input);
getImg('ipad','ipad',$input);
getImg('iphone','iphone',$input);
// getImg('imac','imac');
}
}
}

Answer 1

Your function should be declared outside the foreach loop like so
function getImg($img,$str,$input){
// dd($img);
$img_path = public_path().'/images/photos/devices/'.$img.'.jpg';
if(file_exists($img_path)){
if(strpos($input,$str)){
return $img;
}else{
return 'no-img';
}
}else{
return 'no-img';
}
}
foreach ($devices as $i=>$device) {
..........
}

Answer 2

In PHP a function is always in the global scope, this is different from JavaScript, where functions in functions are common.
So when you call your function img a second time it will try to redeclare the function getImg.
You should define your function outside of the first one, or wrap it in :
if ( ! function_exists('getImg')) {
...declare function
}
From the doc:
All functions and classes in PHP have the global scope - they can be
called outside a function even if they were defined inside and vice
versa.