include once


The include_once statement includes and evaluates the specified file during the execution of the script. This is a behavior similar to the include statement, with the only difference being that if the code from a file has already been included, it will not be included again, and include_once returns TRUE. As the name suggests, the file will be included just once.


include_once may be used in cases where the same file might be included and evaluated more than once during a particular execution of a script, so in this case it may help avoid problems such as function redefinitions, variable value reassignments, etc.


	      	config.php
			<?php
			return array("test">1);

			-------------
			//first
			$config = include_once("config.php");
			var_dump($config);

			$config = include_once("config.php");
			var_dump($config);

			-------------------
			output will be
			array(
			    "test"=>1,
			)
	      




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