Allow a script to run only between two times and email on error

allow-script-to-run.php

<?php
########################
// allow a script to only be run between two times
// EG: you can use this for a cron job and if someone tries to access it outside the times
//     then you can block the request.
########################
header('Content-type: application/json; charset=utf-8'); //set the page to text only (optional)
$start_time = "09:00";
$end_time = "09:30";
$server_time_zone = date_default_timezone_get(); //this is the current server timezone
date_default_timezone_set('Europe/Madrid'); //change the server timezone to a custom time
$script_time_zone = date_default_timezone_get(); //confirm the new timezone
$now = new DateTime(); //get the time of the server right now
$begin = new DateTime($start_time); //set the first time
$end = new DateTime($end_time); / set the second tim
if ($now >= $begin && $now <= $end) { 
  $cron_can_run = true; 
} else { 
  $cron_can_run = false; 
}

//if cron cant run, hard exit
if($cron_can_run == false) {
	
	$time_now = date('H:i a'); 
	echo "Error - cron cannot run.\n";
	echo "Cron can only run between the hours of $start_time and $end_time and current time is: $time_now.\n";
	echo "Times are based on $script_time_zone time zone.\n";
	echo "If you continue to see this error please contact craig@jucra.com.";
	
	//if the request failed and its from cpanl cron you can send an email
	if($_GET["request"] == "cpanel-cron") {
		
		$to = "joe@bloggs.com";
		$from = "no-reply@bloggs.com";
		$subject = "error with cron on content system at $time_now";
		$message .=	"<strong style='color:red;'>ERROR WITH CRON ON CONTENT SYSTEM</strong>";
		$message .=	"<br><br>";
		$message .=	"Cpanel tried to make a request to the cron located at: xxxxxxxx";
		$message .=	"<br><br>";
		$message .=	"The request failed so customers were not sent their emails.";
		$message .=	"<br><br>";
		$message .=	"Here is some additional data for you to troubleshoot.";
		$message .=	"<br><br>";
		$message .=	"Server time zone: $server_time_zone<br>";
		$message .=	"Script time zone: $script_time_zone<br>";
		$message .=	"Time of request: $time_now<br>";
		$message .=	"Script is allowed to run between $start_time and $end_time<br>";
		$message .=	"IP of request: ". $_SERVER['REMOTE_ADDR'] . "<br>";
		$message .=	"<br><br>";
		$message .=	"<--- end of notifcation";
		$message .= "</body></html>";

		//build the html headers
		$headers  = "From: " . $from . "\r\n";
		$headers .= "Reply-To: ". $reply_to . "\r\n";
		$headers .= "BCC: ". $bcc. "\r\n";
		$headers .= "MIME-Version: 1.0\r\n";
		$headers .= "Content-Type: text/html; charset=ISO-8859-1\r\n";

		mail($to, $from, $reply_to, $bcc, $subject, $message, $headers);
		
		echo "\n\nNOTICE: Alert email sent to joe@bloggs.com.";
		
	}
	
	exit;
	
}