php中include_once和require_once性能分析

 <?php

    set_include_path("/tmp/:/tmp2/");

    include_once("2.php");

    ?>

    <?php

    set_include_path("/tmp");

    function a($arg = array()) {

        include_once("b.php");

    }

    a();

    a();

    ?>

    <?php

      class B {}

    ?>

/* Person.class.php */
<?php
class Person {
var $name, $age;

function __construct ($name, $age)
{
$this->name = $name;
$this->age = $age;
}
}
?>

/* no_autoload.php */
<?php
require_once (”Person.class.php”);

$person = new Person(”Altair”, 6);
var_dump ($person);
?>

/* autoload.php */
<?php
function __autoload($classname) {
require_once ($classname . “class.php”);
}

$person = new Person(”Altair”, 6);
var_dump ($person);
?>

<?php
function my_sort($a, $b)
  {
  if ($a == $b) return 0;
  return ($a > $b) ? -1 : 1;
  }

$people = array("Swanson" => "Joe",
"Griffin" => "Peter", "Quagmire" => "Glenn",
"swanson" => "joe", "griffin" => "peter",
"quagmire" => "glenn");

uksort($people, "my_sort");

print_r ($people);
?>输出：

Array
(
[swanson] => joe
[quagmire] => glenn
[griffin] => peter
[Swanson] => Joe
[Quagmire] => Glenn
[Griffin] => Peter
)

$data[5] = array('volume' => 67, 'edition' => 2);
$data[4] = array('volume' => 86, 'edition' => 1);
$data[2] = array('volume' => 85, 'edition' => 6);
$data[3] = array('volume' => 98, 'edition' => 2);
$data[1] = array('volume' => 86, 'edition' => 6);
$data[6] = array('volume' => 67, 'edition' => 7);
// 准备要排序的数组
foreach ($data as $k => $v) {
    $edition[] = $v['edition'];
}
array_multisort($edition, SORT_ASC, $data);
print_r($data);将输出：

Array
(
    [0] => Array
        (
            [volume] => 86
            [edition] => 1
        )

    [1] => Array
        (
            [volume] => 67
            [edition] => 2
        )

    [2] => Array
        (
            [volume] => 98
            [edition] => 2
        )

    [3] => Array
        (
            [volume] => 85
            [edition] => 6
        )

    [4] => Array
        (
            [volume] => 86
            [edition] => 6
        )

    [5] => Array
        (
            [volume] => 67
            [edition] => 7
        )

)

<?php
$con = mysql_connect("localhost","mysql_user","mysql_pwd");
if (!$con)
  {
  die('Could not connect: ' . mysql_error());
  }

// 一些代码...

mysql_close($con);
?>

<?php
//connect.php
$db_server="localhost";// 数据库服务器名称
$db_user="root"; // 连接数据库用户名
$db_pwd="leaf";//连接数据库密码
$db_name="test";//数据库的名字
$db=mysql_connect($db_server,$db_user,$db_pwd,$db_name);
/*
面向对像
$db=new mysql($db_server,$db_user,$db_pwd,$db_name);
*/
 
if(!$db)echo "fail";
else echo "connect success"
?>

<?php ......
$db=mysqli_connect($db_server,$db_user,$db_pwd,$db_name);
/*
面向对象
$db=new mysqli($db_server,$db_user,$db_pwd,$db_name);
*/
if(mysqli_connect_errno()){
  echo "Error: Could not connect to database. Please try again laer.";
  exit;
}
else echo "Success!";
?>

<?php
//db_config.php
$db_server="localhost";// 数据库服务器名称
$db_user="root"; // 连接数据库用户名
$db_pwd="leaf";//连接数据库密码
$db_name="test";//数据库的名字
?>

<?php
// connect.php
require_once(“db_config.php”);//包含配置文件
$db=mysql_connect($db_server,$db_user,$db_pwd,$db_name);
//同样也可以用面向对像的语法
if(!$db)echo "fail";
else echo "connect success"
?>

register_shutdown_function(‘functionname’);  
set_error_handler(‘functionname’); 

<?php

# 定义application路径

define('APPPATH', trim(__DIR__,'/'));

# 获得请求地址

$root = $_SERVER['SCRIPT_NAME'];

$request = $_SERVER['REQUEST_URI'];

$URI = array();

# 获得index.php 后面的地址

$url = trim(str_replace($root, '', $request), '/');

# 如果为空，则是访问根地址

if (empty($url))

{

    # 默认控制器和默认方法

    $class = 'Index';

    $func = 'welcome';

}

else

{

    $URI = explode('/', $url);

    # 如果function为空 则默认访问index

    if (count($URI) < 2)

    {

        $class = ucfirst($URI[0]);

        $func = 'index';

    }

    else

    {

        $class = ucfirst($URI[0]);

        $func = $URI[1];

    }

}

# 把class加载进来

include(APPPATH . '/' . 'application/controllers/' . $class . '.php');

#实例化

$obj = new $class;

call_user_func_array(

    # 调用内部function

    array($obj,$func),

    # 传递参数

    array_slice($URI, 2)

);

 
<?php  
 
# 定义application路径  
define(‘APPPATH’, trim(__DIR__,’/'));  
 
# 获得请求地址  
$root = $_SERVER['SCRIPT_NAME'];  
$request = $_SERVER['REQUEST_URI'];  
 
$URI = array();  
 
# 获得index.php 后面的地址  
$url = trim(str_replace($root, ”, $request), ‘/’);  
 
# 如果为空，则是访问根地址  
if (empty($url))  
{  
    # 默认控制器和默认方法  
    $class = ‘index’;  
    $func = ‘welcome’;  
}  
else 
{  
    $URI = explode(‘/’, $url);  
 
    # 如果function为空 则默认访问index  
    if (count($URI) < 2)  
    {  
        $class = $URI[0];  
        $func = ‘index’;  
    }  
    else 
    {  
        $class = $URI[0];  
        $func = $URI[1];  
    }  
}  
 
 
# 把class加载进来  
include(APPPATH . ‘/’ . ‘application/controllers/’ . $class . ‘.php’);  
 
#实例化  
$obj = new ucfirst($class);  
 
call_user_func_array(  
    # 调用内部function  
    array($obj,$func),   
    # 传递参数  
    array_slice($URI, 2)  
);  
 

<?php  
 
class Index  
{  
 
    function welcome()  
    {  
        echo ‘I am default controller’;  
    }  
 
}  
 
 
?> 
 

hello.php

 
<?php  
class Hello  
{  
    public function index()  
    {  
        echo ‘hello world’;  
    }  
 
    public function name($name)  
    {  
        echo ‘hello ‘ . $name;  
    }  
}  
 
?>