PHP global count does not reset - php

Question

I am trying to write a function that counts the image while looping through the files for one case (out of many cases), I declared the variable $imageCount global within the function copyInsertImage so that after the image is successfully inserted into the database, I do an $imageCount++.
After processing all the images for the case, the code exits the loop, the function processImages will be recalled again. However, I did a var_dump($imageCount) to print out the image count each time it gets increased by one, and found out that it was never reset back to 0 by the $imageCount = 0 when running the loop for a new case.
I am wondering if declaring global $imageCount has anything to do with it, because the code worked fine previously before grouping the same script into a function. If so, what is the solution?
Thanks!
function processImages($path,$patientID,$caseID)
{
// $path = rootDirectory/patientID
global $targetDirectory;
$targetPath = $targetDirectory.$patientID;
$caseSummaryFolder = $path."/".$caseID."/Summary";
$srcDirPath=$path."/".$caseID."/Summary/slicesdir"; //AKA src
$dstDirPath = $targetPath."/".$caseID;
//copyCaseImages($caseSummaryFolder,$targetCasePath,$patientID,$caseID);
global $status;
// print("processImages case path:".$casePath."</br>");
$files = glob($srcDirPath."/*.png");
echo "\n------------NEW CASE------------\n"
echo "PATIENT: $patientID \n";
echo "CASE: $caseID \n";
echo "--------------------------------\n"
$imageCount = 0;
for($i = 0; $i < count($files); $i++) {
$file = $files[$i];
$fileName = str_ireplace($srcDirPath."/", "", $file);
// if image name doesn't not contain string 'GROT'
if(strripos($fileName, "grot") === false)
{
if(doesImgExist($fileName)!==NULL) {
if (compareFileMTime($srcDirPath,$fileName,doesImgExist($fileName))) {
echo "There's a newer version of $fileName \n";
copyInsertImage($srcDirPath,$dstDirPath,$fileName,$patientID,$caseID);
}
else {
$imageCount++;
}
}
// copy image to analyzedCp and insert new image into DB
else {
copyInsertImage($srcDirPath,$dstDirPath,$fileName,$patientID,$caseID);
}
}
else {
echo "grot*.png files are not included \n";
}
}

Answer 1

If I understood your question correctly, it seems like you are redeclaring "global $imageCount" inside of your "copyInsertImage" function and this function is part of the for-loop. If this is indeed what you have then a problem is that everything time your for-loop hits the "copyInsertImage" function it will take re-declare $imageCount, this re-declaration will make imageCount a new variable and clear whatever you have stored in it. This could be the reason why you are seeing $imageCount = 0.

Answer 2

#andrewsi Answered my question.
My question was solved by declaring the initial $imageCount as global too.
"if you're using globals, you need to declare them as global in every function that uses them. Otherwise, you end up using a local variable with the same name. This is one of the reasons to try to avoid them if possible - it's easier to pass variables into functions when you need them."
Thanks!