PHP basic learning includes require, include

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In PHP , you can insert the contents of another file into a PHP file before it is executed by the server.

a.php:

<?php
/** 
* Created by PhpStorm. 
* User: Administrator 
* Date: 2018/4/23 
* Time: 13:03 
*/
echo "123<br>";
$arr = array("php" => array("Tom", "123456"), "google" => array("Jake", "456123"), "taobao" => array("Lili", "789456"));

b.php:

<?php
/** 
* Created by PhpStorm. 
* User: Administrator 
* Date: 2018/4/23 
* Time: 13:08 
*/
require "a.php";
//require_once "a.php";
//require_once(realpath("./")."/a.php");
//require_once(realpath("../")."/require/a.php");
//echo realpath("./");
//echo realpath("../");
print("<pre class="brush:php;toolbar:false">"); 
// 格式化输出数组
print_r($arr);
print("

Output result:

include and require are identical except for how they handle errors:

• require Generates a fatal error (E_COMPILE_ERROR), after which the script will stop executing.

• include generates a warning (E_WARNING) and the script will continue execution after the error occurs.

is equivalent to copying the code of the a.php file into b.php. Similar methods include require_once(), include(), and include_once(). The methods with the word _once are declared to be loaded only once, because your require_once() file may already require_once(a.php). , if it is loaded again, it will cause repeated loading.

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