PHP: IF sentence is run, but dumps says it shouldn't - php

Question

im sitting with a pretty simple image uploader, where the first image uploaded is going to be treated in a special manner. I then run a loop over all the files, and skip the first image.
For this i have named the first image headImage, and i skip it when it has been moved, and done the other stuff to it.
I have cut out all excess code, and are only displaying the loop causing my problem:
Sorted image array:
array (size=5)
'headImage' =>
array (size=5)
'name' => string '8-skilling-1606-eller-07-54-1-h93a.jpg' (length=38)
'type' => string 'image/jpeg' (length=10)
'tmp_name' => string '/tmp/phpNUoAtX' (length=14)
'error' => int 0
'size' => int 37748
0 =>
array (size=5)
'name' => string '807003718_2_Big.jpg' (length=19)
'type' => string 'image/jpeg' (length=10)
'tmp_name' => string '/tmp/php1TXBdm' (length=14)
'error' => int 0
'size' => int 36328
Foreach loop which skips if the fileKey is "headImage", and dumps the fileKey
foreach($uploadFiles as $fileKey => $file){
if($fileKey == "headImage"){
var_dump($fileKey);
continue;
}
}
And the output from var_dump:
string 'headImage' (length=9)
int 0
Now, why is the if sentence ran when the value of $fileKey clearly isn't "headImage"?

Answer 1

Because "string" == 0 in PHP.
You have to compare using type too, try === comparison:
foreach($uploadFiles as $fileKey => $file){
if($fileKey === "headImage"){
var_dump($fileKey);
continue;
}
}

Answer 2

best and safe way to compare two string is using php strcmp function
use like this :
foreach($uploadFiles as $fileKey => $file){
if(strcmp($fileKey ,"headImage") == 0){
var_dump($fileKey);
continue;
}
}
PHP strcmp function Document