What is the difference between include() and require() in php
include() and require() function does the same process of calling a php or html or js file.
When the included file (i.e., calling a file) is missing in its actual directory, then require() function will returns FATAL ERROR and include() function will return WARNING.
Read: what is the use of include() and require() in php
include_once() function will include a file only when that file is not included before. This function is the recommended for including files, because including a file more than once will arise ERROR
require_once() function performs the same operation performed by include_once() function. The only difference between include_once() function and require_once() function is as like the difference between include() and require() that is include_once() function returns WARNING and require_once() function returns FATAL ERROR, when file is missing.
Example for include() function and require() function
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<?php
include('meta.php');
require('head.php');
echo "Require and include function";
?>
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