<?php
error_reporting(-1);
$peopleCount = 7;
$words = 5;
$girl = 0;

for ($i=0; $i<$peopleCount; $i++) {
	$girls[$i] = "girl_" . ($i+1);
}
print_r($girls);

while (count($girls)>3) {

	for ($i=1; $i <= $words; $i++, $girl++) {
		if ($girl >= count($girls)) {
			$girl = 0;
		}
		echo "$i слово указало на {$girls[$girl]}\n";
		
	}
	$girl--;
    echo "удаляем {$girls[$girl]}\n";
    
    array_splice ($girls, $girl, 1);
    
    print_r($girls);
}