exit;

exit(); // Normal exit</p> <p>exit(1); // Exit with an error code</p> <p>exit(‘Error!’); // Exit and print an error message

if( !file_exists(“”) ) {<br /> exit(“File not found on line 145: customers.txt. Hope you weren’t buying anything …”);<br /> } else {<br /> $file = fopen(“customers.txt, “r”);<br /> // rest of code here

//exit — Output a message and terminate the current script<br /> <?php</p> <p>$filename = ‘/path/to/data-file’;<br /> $file = fopen($filename, ‘r’)<br />     or exit(“unable to open file ($filename)”);</p> <p>?></p> <p>