Batch push files into git repo with size limitation in each commit

gitbackup.php

<?php

/**
 * This script will list all modified/untracked/deleted git files, with their relative path,
 * and add them to a commit group until the group pass 25mb in size, and then will push it.
 *
 * To run this script on the repository root folder by using this command `php gitbackup.php`.
 *
 * Requirements: PHP need to be able to run `exec`.
 */

// Variables
$limit = 26214400;// Aprox. 25mb
$lineCount = $currentFileSize = $pushCount = $added = 0;

// Get list of files to commit (modified, deleted, and untracked
exec('git status -s', $lines);

// Loop results
foreach ($lines AS $line) {
	++$lineCount;
    if (!empty($line)) {
    	$path = trim(substr($line, 3)); // Remove git status leading letter
        addFile($path);
	}
}

// Push any remaining files
if($added){
	commit_push();
}

function addFile($file) {
    global $limit, $currentFileSize, $pushCount, $added;
    $added = true;
    $currentFileSize += filesize($file);
	
    exec("git add {$file}");
    
    if ($currentFileSize >= $limit) {
	    commit_push();
    }
}

function commit_push(){
	global $currentFileSize, $pushCount, $added;
    $added = false;
	++$pushCount;
    exec("git commit -m 'batch push files part {$pushCount}'");
    exec("git push");
    $currentFileSize = 0;
}