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PHP include_once
PHP include_once for beginners and professionals with examples, php file, php session, php date, php array, php form, functions, time, xml, ajax, php mysql, regex, string, oop, chop(), bin2hex(), addslashes(), addcslashes() etc.
include_onceIt is similar as include but it includes external file only one time. First, it will check whether the specified file is already included or not. If the file is not included then it only includes an external file. Example 1
Save as page1.php 
Save as page2.php 
Output: 
Example 2
Change the statement in page1.php 
Output: 
In example2 require_once does not working.
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