<?php
 
//Array com os horarios que possam ser imprimidos
	$hora = array('13:55:40','13:56:40','13:58:41','13:59:40','14:01:00','14:02:00','14:04:40', 	'14:05:00','14:07:10','14:08:00','14:10:23','14:11:23','14:13:39','14:14:23','14:16:39',
	'14:17:23','14:19:13','14:20:23','14:22:40', '14:21:23','14:25:07', '14:26:23', '14:55:40');
 
	//Intervalo que o usuario escolherį entre 3, 15, 30 ou 60
	$interval = 3;
 
	$val1 = $hora[0];
 
	print $val1;
	//
 
	for ($i=0;$i<(count($hora)-1);$i++) {  
		$val2 = $hora[$i+1];
 
		$datetime1 = new DateTime($val1P);
		$datetime2 = new DateTime($val2P);
 
		$intervalo = $datetime1->diff($datetime2);
 
		$result = $intervalo->format('%i');
 
		if($result == $interval){
 
		     print ", ".$val2;
		     $val1P = $val2P;
 
		}
 
	}
				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
				
				
				
				
				
			 
			
				
			
			
				
	
		
		
	
	
		13:55:40, 13:58:41, 14:01:00, 14:04:40, 14:07:10, 14:10:23, 14:13:39, 14:16:39, 14:19:13, 14:22:40, 14:25:07