Helper to get railway time using PHP

index.php

<?php
function getRailwayTime($time){
	$am = explode('am',str_replace(array('am','Am','aM', 'AM'),'am', $time));
	$pm = explode('pm',str_replace(array('pm','Pm','pM', 'PM'),'pm', $time));
	$output = 0;
	
	if(isset($am[1])){
		$output = $am[0];
	}else if(isset($pm[1])){
		if((int)$pm[0] > 0){
			if((int)$pm[0] < 12){
				$output = (int)$pm[0] + 12;
			}else if((int)$pm[0] === 12){
				$output = (int)$pm[0];
			}
		}	
	}
	
	return $output;
	
}

echo getRailwayTime("1pm");