变量是php中非常常用的一个东西,所有的操作都要经过变量来传递,下面我来给各位同学介绍在php中变量的一些常用用法与关于php变量基础知识,
具体方法:
PHP变量用于存储字符、数字、数组甚至对象内容等,以便在我们需要的地方使用.定义一个变量的语法:
$变量名 = 值;
使用变量的例子:
实例代码如下:
- <!–?php
- $var_char = "你好!";
- echo $var_char;
- ?>
1 你好!
从这个例子可以看出,变量名以 $ 开始,标明这是一个变量.变量名以字母(a-z、A-Z)或者下划线 _ 开始,后面可以跟任意字母或数字以及下划线,但不能是空格.如下这些变量名是有效的:
提示:关于变量命名,我们建议变量名以标明其实际语意的组合为佳,如 $my_name 或 $myName 格式.
全局变量global
全局变量便是其中之一,当然这个观点颇具争议,有许多人还是建议禁用全局变量,使用不当对造成程序的可读性很差!结构混乱,调试更是一头雾水,但是不可否认他的便捷,这便是php为什么会用全局变量global原因吧!…
今天就遇到了php 全局变量不起作用的问题.先上一段简单的代码:
实例代码如下:
- <!–?php
- $a = 0 ;
- function Test()
- {
- $a =1;
- }
- Test();
- echo $a;
- ?>
上面的代码中输出是0,那是因为函数体Test内$a变量被缺省设置为局部变量,$a的作用域就是在Test内.修改代码如下:
- ?<!–?php
- $a = 0 ;
- function Test()
- {
- global $a;//申明函数体Test内使用的$a变量为global全局变量
- $a =1;
- }
- Test();
- echo $a;
- ?>
申明函数体Test内使用的$a变量为global全局变量后,使得$a的作用全局,所以输出为1.上面的实例只是基本的global全局变量知识,下面我们看看复杂点的:
实例代码如下:
- //A.php 文件
- <!–?php
- function Test_Global()
- {
- include 'B.php';
- Test();
- }
- $a = 0 ;
- Test_Global();
- echo $a;
- ?>
- //B.php 文件
- <!–?php
- function Test()
- {
- global $a;//申明函数体Sum内使用的$a变量为global全局变量
- $a =1;
- }
- ?>
为什么输出的却是0?!!
解释:A.php文件的内Test_Global是定义好的第三方函数,该函数用include导入了B.php文件内的$a的global全局变量,所以$a被限制在Test_Global局部函数范围内,所以B.php文件内的$a的作用范围都在Test_Global内,而不是作用了整个A.php内….
解决方案:
实例代码如下:
- <!–?php
- function Test_Global()
- {
- Test();
- }
- include 'B.php'; //将include 从局部Test_Global函数中移出
- $a = 0 ;
- Test_Global();
- echo $a;
- ?>
- //B.php 文件
- <!–?php
- function Test()
- {
- global $a;
- $a =1;
- }
- ?>
2.优秀的访问器
实例代码如下:
- //A.php 文件
- <!–?php
- include 'B.php';
- $a =0;
- Set_Global($a);
- echo $a;
- ?>
- //B.php 文件
- <!–?php
- function Set_Global(&$var)
- {
- $var=1;
- }
- ?>
php变量 引用函数 static变量
Text-Segment,这个段最大的特点就是只读.一般存放可执行代码,也有可能常量也存放在这里,比如字符串常量 BSS-Segment,这里存放了那些没有初始化的变量.某种意义来讲,没有初始化的变量都是垃圾,不可用 Data-Segment,这里存放了全局变量和静态变量,直到脚本运行结束,操作系统才会回收这里的内存空间,变量亦会被销毁.
Stack-Heap Segment 函数参数与本地变量(也称局部变量)存放在堆中(stack),还有返回值等等.用完了,操作系统就会回收这部分内存空间.对于C程序员而言,可以自行从栈中(heap)申请内存空间,用完了,也需要自己手动释放.
作为PHP程序言而言,我们关心的是全局变量、静态变量、局部变量、函数参数以及函数返回值.局部变量和函数参数基本上一样,在初始化的时候分配内存空间,退出函数后操作系统会回收内存空间。而全局变量与静态变量要直php脚本运行结束后,内存空间才会被释放.与全局变量不同的时,所有静态变量在程序执行之前就初始化并且分配了内存空间.
注:
1.函数外部声明静态变量意义不大,函数内部声明静态变量受限于作用域,函数外部不能修改函数内部静态变量.
2.引用变量,也是变量,只不过它的值是变量的内存地址.
php保留字global和static实例代码如下:
- <!–?php
- $i = $j = 8;
- function global_var() {
- global $j, $b;
- $c = $j = $b = $i = 4;
- }
- global_var();
- echo "i:$i, j:$j b:$b c:$c n"; //i:8, j:4 b:4 c:
- ?>
函数外和内都有变量$i,但是他们二个是完全不同的变量.函数外的$i是全局变量,该内存空间直到脚本运行结束后才会被释放.函数内的$i是局部变量,程序流经过函数的时候,初始化,退出函数的时候,内存被系统回收,再次调用函数,则再次分配内存空间和回收内存空间.二次分配的内存空间有可能是同一内存地址,也有可能不能同一内存地址.
与$i不同的是$j,通过关键字global将局部变量”转为”全局变量.当调用函数global_var()的时候,并不会重新给$j分配内存空间.同样的,可以在函数外打印$b,却不能打印$c是因为$b是全局变量,不会被销毁.而$c则不能打印,$c已经不存在了.在退出函数就给销毁了.
实例代码如下:
- <!–?php
- $a = 2;
- static $b = 2;
- static $c = 3;
- function global_var() {
- static $i, $c;
- global $j, $a;
- $c = $a = $b = $i = $j = 4;
- }
- global_var();
- echo "a:$a b:$b c:$c i:$i j:$j"; //a:4 b:2 c:3 i: j:4
- ?>
首先,我们看函数外的$b和$c,即是全局变量又是static变量.这里static修饰没有太大的意义,因为他们都存放在数据段(data-segment),直到脚本运行完了之后才会被回收。然后,我们再看函数里面的$i和$c,函数调用后,$i和$c其实都没有被回收,但是$i输出是NULL和$c输出是3,这是因为他们的作用域是函数内部,不是函数外部,也就是说$i和$c在函数外是不可见的.函数内static变量的意义就在于此:仅函数内部可见且不会被销毁。也就是说,保证函退出函数,变量也不会被回收,但又不会被其它函数修改.(注:函数外和函数内的$c是二个不同的变量)
实例代码如下:
- <!–?php
- function global_var() {
- static $i;
- ++$j;
- ++$i;
- echo "j:$j i:$i n";
- }
- global_var(); //j:1 i:1
- global_var(); //j:1 i:2
- global_var(); //j:1 i:3
- ?>
上例中,变量$j一直都是1,而$i每调用一次就累加1.这是因为,局部变量存放在堆段,每次退出函数时都会被回收.而$i存放在存放在数据段(data-segment),直到程序执行完毕才会被回收.我们平常说的static变量,如果没有特别指明,都说的是函数内部的static变量.
引用函数与static变量
既然static变量要直到脚本执行结束,才会被销毁.那么,有没有办法访问该变量的值呢?我们来看看下面的示例:
实例代码如下:
- <!–?php
- get_local_static_var();
- $ptr = &get_local_static_var();
- get_local_static_var();
- ++$ptr;
- get_local_static_var();
- what_i($ptr);
- get_local_static_var(); //??
- what_p($ptr);
- get_local_static_var(); //??
- function &get_local_static_var() {
- static $i;
- ++$i;
- echo "i:$i n";
- return $i;
- }
- function what_i($ptr) {
- $i = &get_local_static_var();
- ++$i;
- ++$ptr;
- }
- function what_p(&$ptr) {
- $i = &get_local_static_var();
- ++$i;
- ++$ptr;
- }
- ?>
二个凝问号处,分别输出是8和12,这就说明了只要变量没有被销毁,还是可以被访问.我们可以通过引用函数将static变量的地址返回其它函数,其它函数则可通过static变量的地址访问并且修改它的值.
drupal应用赏析
drupal定义了一个drupal_static函数,其它函数的static变量都存放在一个数组中,然后对drupal应用到的所有static进行统一管理,比如赋值,重置,删除等.我觉得,这是一个好办法.
实例代码如下:
- <!–?
- function &drupal_static($name, $default_value = NULL, $reset = FALSE) {
- static $data = array(), $default = array();
- if (!isset($name)) {
- foreach ($default as $name => $value) {
- $data[$name] = $value;
- }
- return $data;
- }
- if ($reset) {
- if (array_key_exists($name, $default)) {
- $data[$name] = $default[$name];
- }
- else {
- return $data;
- }
- }
- elseif (!array_key_exists($name, $data)) {
- $default[$name] = $data[$name] = $default_value;
- }
- return $data[$name];
- }
- function ip_address() {
- $ip_address = &drupal_static(__FUNCTION__);
- if (!isset($ip_address)) {
- $ip_address = $_SERVER['REMOTE_ADDR'];
- if (variable_get('reverse_proxy', 0)) {
- if (array_key_exists('HTTP_X_FORWARDED_FOR', $_SERVER)) {
- $reverse_proxy_addresses = variable_get('reverse_proxy_addresses', array());
- if (!emptyempty($reverse_proxy_addresses) &&
- in_array($ip_address, $reverse_proxy_addresses, TRUE)
- ) {
- $ip_address_parts = explode(',', $_SERVER['HTTP_X_FORWARDED_FOR']);
- $ip_address = trim(array_pop($ip_address_parts));
- }
- }
- if (array_key_exists('HTTP_X_CLUSTER_CLIENT_IP', $_SERVER)) {
- $ip_address = $_SERVER['HTTP_X_CLUSTER_CLIENT_IP'];
- }
- }
- }
- return $ip_address;
- }
- ip_address();
- //在drupal中很多这样的应用方式,将其它函数的static变量都存放到一个地方,即drupal_static的data中,然后再统一管理,比如重置等等。
- ?>
波比源码 » Php入门教程之PHP 变量基本语法
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