Can anyone spot any errors with the code below? I need it to display an output that matches with this document from the client (see screenshot here: https://twitter.com/fredbradley/status/322399388146216961/photo/1 )

nextPlayFunction.php

<?php

/*
 * FOR THE PHP GEEKS!
   ------------------
   
   Can anyone spot any errors with the code below? 
   
   I need it to display an output that matches with this document from the client (see screenshot here: https://twitter.com/fredbradley/status/322399388146216961/photo/1 )
   
   I'm 99.9% that it works as needed. But alas I can't triple check it without staying up for every hour in a whole week!
   
   Any questions, or comments please get in touch via email: hello@fredbradley.co.uk
   
   Many thanks, 
   
   Fred 
   

<Start>

/* ====================================================================
   SET A COUPLE OF DEFINED PHRASES SO YOU DON'T HAVE TO TYPE TOO MUCH!
   ==================================================================== */
   define("PLAY_NOW", "You can play right now!");
   define("NEXT_CHANCE", "Your next chance to play is just after");

function nextPlay() {
date_default_timezone_set('Europe/London');
        if (date("w") > "0" && date("w") < "7") {
        // If it's Mon, Tue, Wed, Thu, Fri or Sat
          	if (date("Hi") < "0901") {
	        		$output = NEXT_CHANCE." 9am";	        		
        		} elseif (date("Hi") > "0901" && date("Hi") < "0941") {
	        		$output = PLAY_NOW;
        		} elseif (date("Hi") > "0940" && date("Hi") < "1002") {
	        		$output = NEXT_CHANCE." 10am";
        		}
        		for( $i=10; $i<16; $i++ ) {
        			// A cheeky for loop to save on the amount of writing IF statements you have to do!
	        		if (date("Hi") > $i."01" && date("Hi") < $i."41") {
		        		$output = PLAY_NOW;
	        		} elseif (date("Hi") > $i."40" && date("Hi") < ($i+1)."02") {
		        		$output = NEXT_CHANCE." ".nextPlay_simplifytime($i+1);
	        		}
        		}
        		
        		if (date("Hi") > "1541") {
	        		echo NEXT_CHANCE." 9am tomorrow!";
        		}
        } 
        
        if (date("w") == "6" && date("Hi") > "1240") {
	        // If it's Saturday and it's after 1240... (NB: This overrides the above)
	        $output = NEXT_CHANCE." 9am on Monday!";
        } 
        
        if (date("w") == "0") {
	        // If it's Sunday... (NB: This overrides the above)
	        $output = NEXT_CHANCE." 9am tomorrow!";
        }

return $output;
}

function nextPlay_simplifytime($i) {
	if ($i > 11) {
	// If the hour is midday or after
		$m = "pm";
		if ($i > 12) {
			// If it's 1pm or later then deduct 12 to get the 'PM' time. (eg. 15 minus 12 equals 3)
			$i = $i-12;
		}
	} else {
	// Otherwise it must be morning!
		$m = "am";
	}
	// Return giving me the hour (in 12 hour format, with AM/PM)
	return $i.$m;
}

echo nextPlay();

/* Thanks for helping! :) 

<End> */
?>

If you made the function signature to be:

function nextPlay($day, $hour)

And swapped ‛date('w')‛ for ‛$day‛, then you could call it manually and see the result it gave. And to get the current value, you'd just call the function with those two ‛date‛ variables.

Good suggestion! Thanks Sam! :)