<?php
$a=[2,7,14,28,32,38,41,49];
$b=30;
$cc=0;
while(1){
	if( floor($a[$cc]) && floor($a[$cc+1]) ){
		if( floor($a[$cc]) < $b && $b < floor($a[$cc+1]) ){
			echo '找到('.$a[$cc].'-'.$a[$cc+1].')' ; 
		}
	}else{echo '結束';break;}
	$cc=$cc+1;
}