<?php
	
	function arred ($n) {
		$r = fmod($n, 1.0);
		if ($r != 0) {
			return $n - $r + 0.5;
		} else {
			return $n;
		}
	}

        echo(arred(2.0) . "\r");
	echo(arred(2.1) . "\r");
	echo(arred(2.2) . "\r");
	echo(arred(2.3) . "\r");
	echo(arred(2.4) . "\r");
	echo(arred(2.5) . "\r");
	echo(arred(2.6) . "\r");
	echo(arred(2.7) . "\r");
	echo(arred(2.8) . "\r");
	echo(arred(2.9) . "\r");
	

2
2.5
2.5
2.5
2.5
2.5
2.5
2.5
2.5
2.5