include 'include.php tutorial'; / / Reference include.php file
echo a ();
// result bb
?>
include.php file is as follows
<? php
// Create include.php for other files to call
function a () // Define function a
{
b (); // Call function b in function a
}
function b () // define function b
{
c (); // Call function c in function b
}
function c () // define function c
{
echo ('bb'); // Output a php backtrace
}
a (); // use function a
?>
Other tips:
When a file is called using the require () statement, the require () statement prints an error message and immediately terminates the script if the file is not found, whereas the include () statement will output a warning if the file is not found, without terminating the script Processing
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