<?php
 
function listaHorarios($horaInicio, $horaFinal) {
	$secsInicio = strtotime($horaInicio) - strtotime('today');
	$secsFinal = strtotime($horaFinal) - strtotime('today');
 
	$formato = function ($horario) {
		return date('g:ia', $horario);
	};
 
	$horarios = range($secsInicio, $secsFinal, 900);
	return array_map($formato, $horarios);
}
 
$horaInicio = '08:00:00';
$horaFinal  = '15:00:00';
 
$horarios = listaHorarios($horaInicio, $horaFinal);
 
foreach($horarios as $horario){
	echo "$horario \n";
}
 
 
 
 

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