Require-once and phprequire-once in php

Require-once and phprequire-once in php

The require_once statement is identical to the require statement. The only difference is that PHP checks whether the file has been included. If so, it does not include the file again.

Refer to the include_once document to understand the meaning of _ once, and understand what is different from when _ once is not used.

Usage

<? Php
Define ('_ ROOT _', dirname (_ FILE __)));
Require_once (_ ROOT _. '/config. php ');
?>
Method 2:

<? Phprequire_once ('/var/www/public_html/config. php');?>

2 For example: Edit

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19

<? Php Require_once ('sys/config. php '); Require_once ('header. php '); ?>   <Divclass = "row"> <Divclass = "ddos" style = "text-align: center;"> <H1> <B> System Platform </B> <P> a simple message board system platform </p> <br/> </Div> <Divclass = "xx_xx"> <H2> a simple message board. </H2> <P> </p> </Div> </Div>   <? Php Require_once ('footer. php '); ?>