Help with adding time

Hi guys,

I am trying to add 30 minutes to a Unix time stamp. Currenly the seconds are
increased but not the minutes.

The UNIX timestamp is echoed into a file by a BASH script for later use.

Here is my code:
####################################################################################
<?php
	$time_now = time() ;

	$BASH_file = fopen ( "/usr/local/bin/scripts/txt/time.txt", "r" ) ;
	$BASH_value = fread ( $time_file, "10" ) ;

	$current_time = ( date ( 'Y-m-d H:m:s', $time_now ) ) ;
	$endtime =  ( date ( 'Y-m-d H:m:s', $BASH_value ) ) ;
	
	$target_time = date ( 'Y-m-d H:m:s', strtotime ( "+30 minutes", $BASH_value ) ) ;
	
	print ( $target_time."\n" ) ;

        if ( $current_time >= $target_time )
          {
            print ( "Time is greater\n" ) ;
          }
        else
          {
            print ( "Time is less\n" ) ;
          }
	
	fclose ( $time_file ) ;
	
?>
###################################################################################

Any pointers?

Thank you

Danny