Wilfred's Algorithm in PHP

wilfred_algorithm.php

<?php 
$you = 1;
$p = 2;
$f = [ $you, $p ];

// Random conversation
$conv = mt_rand( 0, 3 );
// At the beginning set the last date of conversation
$cur_date = '2017-02-06';
$x[ $p ][ $you ] = [ $cur_date => $conv ];
$x[ $you ][ $p ] = [ $cur_date => $conv ];

if( !empty( $x[ $you ][ $p ][ $cur_date ] ) ) {
	$interaction_dates = array_keys( $x[ $you ][ $p ] );

	// Get last date of conversation
	$last_date = $interaction_dates[ count( $interaction_dates ) - 1 ];

	// Get month interval
	$year_interval = date_diff( date_create( $last_date ), date_create( date( 'Y-m-d' ) ) );
	$year_interval = $year_interval->format( '%y' ); 

	if( $year_interval >= 1 ) {
		// Can't check usefulness in codes, so I will go ahead and delete P :D
		unset( $f[ $p ] );
		echo 'Its less than 12months of chats. P is unfriended';
	}
	else {
		// You and P keep conversing and once P says 0 in a row, it means he is silent, probably dead.
		$silence = 0;
		while( $silence < 3 ) {
			$conv = mt_rand( 0, 3 );
			if( $conv == 0 ) 
				$silence++;
			else 
				$silence = 0;
			echo 'P responded with ' . $conv . '<br />';
			$x[ $you ][] = [ date( 'Y-m-d' ) => $conv ];
		}
		echo 'P is dead, has not responded thrice';
	}
}
else {
	echo 'P never responded first message. He is not interested, P is unfriended!'; 
	unset( $f[ $p ] );
}