circular references

circular-references.php

<?php

class Vinoth {
    public $f;   
}

class Kevin {
    public $f;   
}

while(1){
    
    $a = new Vinoth;
    $b = new Kevin;
    
    $a->f = $b;
    $b->f = $a;
    
    echo "Memory usage" .number_format(memory_get_usage(true)) . " bytes\n";
    
    unset($a);
    unset($b);
}