potentially memory leak in VAR DUMPER

[amir-khoshbakht]

is it memory leak ?
When I run this code, after a few moments, the memory usage shown goes up and continues until it reaches the maximum allowed value and the program closes.

step to produce:
1- make an empty Laravel project.
2- make a new console command.
3- paste this code in its handle() method

    while(true){
        $string = memory_get_peak_usage(true) / 1024 / 1024;
        dump($string);
         //            echo($string.PHP_EOL);
    }

This does not happen in either case :
1- using echo() function instead of dump().(commented out)
2-using dump() in an plain .php file.

It consumes exactly 2 MB( 1024 * 1024 * 2 bytes ) more memory each time!!!