1. Overview and installation
PHP 5 has a complete reflection API, adding the ability to reverse engineer classes, interfaces, functions, methods and extensions. Additionally, the Reflection API provides methods to extract documentation comments from functions, classes, and methods.
Please note that some internal APIs are missing code required for reflection extensions to work. For example, a built-in PHP class may be missing data for a reflected property. These rare cases are considered bugs, however, and as such, they should be discovered and fixed.
No installation is required to use these functions, they are part of the PHP core.
2. Usage examples
There are many examples in the reflection documentation, usually in the __construct documentation of each class.
Example A reflection example in Shell (a terminal)
$ php --rf strlen
$ php --rc finfo
$ php --re json
$ php --ri dom
The output of the above routine Similar to:
Function [ <internal:Core> function strlen ] { - Parameters [1] { Parameter #0 [ <required> $str ] } } Class [ <internal:fileinfo> class finfo ] { - Constants [0] { } - Static properties [0] { } - Static methods [0] { } - Properties [0] { } - Methods [4] { Method [ <internal:fileinfo, ctor> public method finfo ] { - Parameters [2] { Parameter #0 [ <optional> $options ] Parameter #1 [ <optional> $arg ] } } Method [ <internal:fileinfo> public method set_flags ] { - Parameters [1] { Parameter #0 [ <required> $options ] } } Method [ <internal:fileinfo> public method file ] { - Parameters [3] { Parameter #0 [ <required> $filename ] Parameter #1 [ <optional> $options ] Parameter #2 [ <optional> $context ] } } Method [ <internal:fileinfo> public method buffer ] { - Parameters [3] { Parameter #0 [ <required> $string ] Parameter #1 [ <optional> $options ] Parameter #2 [ <optional> $context ] } } } } Extension [ <persistent> extension #23 json version 1.2.1 ] { - Constants [10] { Constant [ integer JSON_HEX_TAG ] { 1 } Constant [ integer JSON_HEX_AMP ] { 2 } Constant [ integer JSON_HEX_APOS ] { 4 } Constant [ integer JSON_HEX_QUOT ] { 8 } Constant [ integer JSON_FORCE_OBJECT ] { 16 } Constant [ integer JSON_ERROR_NONE ] { 0 } Constant [ integer JSON_ERROR_DEPTH ] { 1 } Constant [ integer JSON_ERROR_STATE_MISMATCH ] { 2 } Constant [ integer JSON_ERROR_CTRL_CHAR ] { 3 } Constant [ integer JSON_ERROR_SYNTAX ] { 4 } } - Functions { Function [ <internal:json> function json_encode ] { - Parameters [2] { Parameter #0 [ <required> $value ] Parameter #1 [ <optional> $options ] } } Function [ <internal:json> function json_decode ] { - Parameters [3] { Parameter #0 [ <required> $json ] Parameter #1 [ <optional> $assoc ] Parameter #2 [ <optional> $depth ] } } Function [ <internal:json> function json_last_error ] { - Parameters [0] { } } } } dom DOM/XML => enabled DOM/XML API Version => 20031129 libxml Version => 2.7.3 HTML Support => enabled XPath Support => enabled XPointer Support => enabled Schema Support => enabled RelaxNG Support => enabled
3. Related extensions
If you want to create specialized versions of built-in classes (for example, when creating and exporting highlighted HTML, replace methods with easily accessible member variables or use utility methods) , you can continue and extend them.
Example #1 Extending a built-in class
<?php /** * My Reflection_Method class */ class My_Reflection_Method extends ReflectionMethod { public $visibility = array(); public function __construct($o, $m) { parent::__construct($o, $m); $this->visibility = Reflection::getModifierNames($this->getModifiers()); } } /** * Demo class #1 * */ class T { protected function x() {} } /** * Demo class #2 * */ class U extends T { function x() {} } // 输出信息 var_dump(new My_Reflection_Method('U', 'x')); ?> 以上例程的输出类似于: object(My_Reflection_Method)#1 (3) { ["visibility"]=> array(1) { [0]=> string(6) "public" } ["name"]=> string(1) "x" ["class"]=> string(1) "U" }
If you override the constructor, remember to call the parent class's constructor before writing any inserted code. Failure to do so will result in the following results: Fatal error: Internal error: Failed to retrieve the reflection object
4. Reflection class
Reflection — Reflection class
ReflectionClass — ReflectionClass class
ReflectionZendExtension — ReflectionZendExtension class
ReflectionExtension — ReflectionExtension class
ReflectionFunction — ReflectionFunction class
ReflectionFunctionAbstract — ReflectionFunctionAbstract class
ReflectionMethod — ReflectionMethod class
ReflectionObject — ReflectionObject class
ReflectionParameter — ionParameter class
ReflectionProperty — ReflectionProperty class
Reflector — Reflector interface
ReflectionException — ReflectionException class

php把负数转为正整数的方法:1、使用abs()函数将负数转为正数,使用intval()函数对正数取整,转为正整数,语法“intval(abs($number))”;2、利用“~”位运算符将负数取反加一,语法“~$number + 1”。

实现方法:1、使用“sleep(延迟秒数)”语句,可延迟执行函数若干秒;2、使用“time_nanosleep(延迟秒数,延迟纳秒数)”语句,可延迟执行函数若干秒和纳秒;3、使用“time_sleep_until(time()+7)”语句。

php除以100保留两位小数的方法:1、利用“/”运算符进行除法运算,语法“数值 / 100”;2、使用“number_format(除法结果, 2)”或“sprintf("%.2f",除法结果)”语句进行四舍五入的处理值,并保留两位小数。

php字符串有下标。在PHP中,下标不仅可以应用于数组和对象,还可应用于字符串,利用字符串的下标和中括号“[]”可以访问指定索引位置的字符,并对该字符进行读写,语法“字符串名[下标值]”;字符串的下标值(索引值)只能是整数类型,起始值为0。

判断方法:1、使用“strtotime("年-月-日")”语句将给定的年月日转换为时间戳格式;2、用“date("z",时间戳)+1”语句计算指定时间戳是一年的第几天。date()返回的天数是从0开始计算的,因此真实天数需要在此基础上加1。

在php中,可以使用substr()函数来读取字符串后几个字符,只需要将该函数的第二个参数设置为负值,第三个参数省略即可;语法为“substr(字符串,-n)”,表示读取从字符串结尾处向前数第n个字符开始,直到字符串结尾的全部字符。

方法:1、用“str_replace(" ","其他字符",$str)”语句,可将nbsp符替换为其他字符;2、用“preg_replace("/(\s|\ \;||\xc2\xa0)/","其他字符",$str)”语句。

php判断有没有小数点的方法:1、使用“strpos(数字字符串,'.')”语法,如果返回小数点在字符串中第一次出现的位置,则有小数点;2、使用“strrpos(数字字符串,'.')”语句,如果返回小数点在字符串中最后一次出现的位置,则有。


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