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include_once

It 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

PHP include_once

Save as page2.php

PHP include_once

Output:

PHP include_once

Example 2

Change the statement in page1.php

PHP include_once

Output:

PHP include_once

In example2 require_once does not working.

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