很多站长朋友们都不太清楚phpmanual，今天小编就来给大家整理phpmanual，希望对各位有所帮助，具体内容如下：
本文目录一览： 1、 php 常用的数组函数都有哪些？ 作用是什么？有什么特点？ 怎么使用？ 2、 php安装的问题，无法载入 mysql 扩展，请检查 PHP 配置 3、 是什么意思' title='php->是什么意思'>php->是什么意思 4、 学习PHP要从哪开始？ php 常用的数组函数都有哪些？ 作用是什么？有什么特点？ 怎么使用？php常用的数组函数的作用特点如下：
array_change_key_case ? ????-- 返回字符串键名全为小写或大写的数组
array_chunk ? ? ? ? ? ? ????-- 将一个数组分割成多个
array_combine ? ? ? ? ? -- 创建一个数组，用一个数组的值作为其键名，另一个数组的值作为其值
array_count_values ? ? ?-- 统计数组中所有的值出现的次数
array_diff_assoc ? ? ? ?-- 带索引检查计算数组的差集
array_diff_key ? ? ? ? ?-- 使用键名比较计算数组的差集
array_diff_uassoc ? ? ? -- 用用户提供的回调函数做索引检查来计算数组的差集
array_diff_ukey ? ? ? ? -- 用回调函数对键名比较计算数组的差集
array_diff ? ? ? ? ? ? ?-- 计算数组的差集
array_fill_keys ? ? ? ? -- 使用指定的键和值填充数组
array_fill ? ? ? ? ? ? ?-- 用给定的值填充数组
array_filter ? ? ? ? ? ?-- 用回调函数过滤数组中的单元
array_flip ? ? ? ? ? ? ?-- 交换数组中的键和值
array_intersect_assoc ? -- 带索引检查计算数组的交集
array_intersect_key ? ? -- 使用键名比较计算数组的交集
array_intersect_uassoc ?-- 带索引检查计算数组的交集，用回调函数比较索引
array_intersect_ukey ? ?-- 用回调函数比较键名来计算数组的交集
array_intersect ? ? ? ? -- 计算数组的交集
array_key_exists ? ? ? ?-- 检查给定的键名或索引是否存在于数组中
array_keys ? ? ? ? ? ? ?-- 返回数组中所有的键名
array_map ? ? ? ? ? ? ? -- 将回调函数作用到给定数组的单元上
array_merge_recursive ? -- 递归地合并一个或多个数组
array_merge ? ? ? ? ? ? -- 合并一个或多个数组
array_multisort ? ? ? ? -- 对多个数组或多维数组进行排序
array_pad ? ? ? ? ? ? ? -- 用值将数组填补到指定长度
array_pop ? ? ? ? ? ? ? -- 将数组最后一个单元弹出（出栈）
array_product ? ? ? ? ? -- 计算数组中所有值的乘积
array_push ? ? ? ? ? ? ?-- 将一个或多个单元压入数组的末尾（入栈）
array_rand ? ? ? ? ? ? ?-- 从数组中随机取出一个或多个单元
array_reduce ? ? ? ? ? ?-- 用回调函数迭代地将数组简化为单一的值
array_replace_recursive -- 使用传递的数组递归替换第一个数组的元素
array_replace ? ? ? ? ? -- 使用传递的数组替换第一个数组的元素
array_reverse ? ? ? ? ? -- 返回一个单元顺序相反的数组
array_search ? ? ? ? ? ?-- 在数组中搜索给定的值，如果成功则返回相应的键名
array_shift ? ? ? ? ? ? -- 将数组开头的单元移出数组
array_slice ? ? ? ? ? ? -- 从数组中取出一段
array_splice ? ? ? ? ? ?-- 把数组中的一部分去掉并用其它值取代
array_sum ? ? ? ? ? ? ? -- 计算数组中所有值的和
array_udiff_assoc ? ? ? -- 带索引检查计算数组的差集，用回调函数比较数据
array_udiff_uassoc ? ? ?-- 带索引检查计算数组的差集，用回调函数比较数据和索引
array_udiff ? ? ? ? ? ? -- 用回调函数比较数据来计算数组的差集
array_uintersect_assoc ?-- 带索引检查计算数组的交集，用回调函数比较数据
array_uintersect_uassoc -- 带索引检查计算数组的交集，用回调函数比较数据和索引
array_uintersect ? ? ? ?-- 计算数组的交集，用回调函数比较数据
array_unique ? ? ? ? ? ?-- 移除数组中重复的值
array_unshift ? ? ? ? ? -- 在数组开头插入一个或多个单元
array_values ? ? ? ? ? ?-- 返回数组中所有的值
array_walk_recursive ? ?-- 对数组中的每个成员递归地应用用户函数
array_walk ? ? ? ? ? ? ?-- 对数组中的每个成员应用用户函数
array ? ? ? ? ? ? ? ? ? -- 新建一个数组
arsort ? ? ? ? ? ? ? ? ?-- 对数组进行逆向排序并保持索引关系
asort ? ? ? ? ? ? ? ? ? -- 对数组进行排序并保持索引关系
compact ? ? ? ? ? ? ? ? -- 建立一个数组，包括变量名和它们的值
count ? ? ? ? ? ? ? ? ? -- 计算数组中的单元数目或对象中的属性个数
current ? ? ? ? ? ? ? ? -- 返回数组中的当前单元
each ? ? ? ? ? ? ? ? ? ?-- 返回数组中当前的键／值对并将数组指针向前移动一步
end ? ? ? ? ? ? ? ? ? ? -- 将数组的内部指针指向最后一个单元
extract ? ? ? ? ? ? ? ? -- 从数组中将变量导入到当前的符号表
in_array ? ? ? ? ? ? ? ?-- 检查数组中是否存在某个值
key ? ? ? ? ? ? ? ? ? ? -- 从关联数组中取得键名
krsort ? ? ? ? ? ? ? ? ?-- 对数组按照键名逆向排序
ksort ? ? ? ? ? ? ? ? ? -- 对数组按照键名排序
list ? ? ? ? ? ? ? ? ? ?-- 把数组中的值赋给一些变量
natcasesort ? ? ? ? ? ? -- 用“自然排序”算法对数组进行不区分大小写字母的排序
natsort ? ? ? ? ? ? ? ? -- 用“自然排序”算法对数组排序
next ? ? ? ? ? ? ? ? ? ?-- 将数组中的内部指针向前移动一位
pos ? ? ? ? ? ? ? ? ? ? -- current 的别名
prev ? ? ? ? ? ? ? ? ? ?-- 将数组的内部指针倒回一位
range ? ? ? ? ? ? ? ? ? -- 建立一个包含指定范围单元的数组
reset ? ? ? ? ? ? ? ? ? -- 将数组的内部指针指向第一个单元
rsort ? ? ? ? ? ? ? ? ? -- 对数组逆向排序
shuffle ? ? ? ? ? ? ? ? -- 将数组打乱
sizeof ? ? ? ? ? ? ? ? ?-- count 的别名
sort ? ? ? ? ? ? ? ? ? ?-- 对数组排序
uasort ? ? ? ? ? ? ? ? ?-- 使用用户自定义的比较函数对数组中的值进行排序并保持索引关联
uksort ? ? ? ? ? ? ? ? ?-- 使用用户自定义的比较函数对数组中的键名进行排序
usort ? ? ? ? ? ? ? ? ? -- 使用用户自定义的比较函数对数组中的值进行排序
关于如何使用，那是要根据使用者需求来衡量，不能一言概括
使用语法如下：
<?php
????$arr?=?array('Hello','World!');
????$arr?=?implode(',',$arr);
????
????echo?$arr;
?>
结果是：HelloWorld!
如果你想更多的了解php的数组函数，我建议你详细地去看看php手册
php手册官网：
php安装的问题，无法载入 mysql 扩展，请检查 PHP 配置首先你需要将PHP安装目录下的php_mysql.dll和php_mysqli.dll（我的在D:\apptools\php5\ext目录下）复制到c:\windows\system32目录下，然后修改php.ini文件（需要放到c:\windows目录下），关键是extension=php_mysql.dll 和extension_dir = "D:/apptools/php5/ext"。
我的配置是这样的：
[PHP]
;;;;;;;;;;;
; WARNING ;
;;;;;;;;;;;
; This is the default settings file for new PHP installations.
; By default, PHP installs itself with a configuration suitable for
; development purposes, and *NOT* for production purposes.
; For several security-oriented considerations that should be taken
; before going online with your site, please consult php.ini-recommended
; and .
;;;;;;;;;;;;;;;;;;;
; About php.ini ;
;;;;;;;;;;;;;;;;;;;
; This file controls many aspects of PHP's behavior. In order for PHP to
; read it, it must be named 'php.ini'. PHP looks for it in the current
; working directory, in the path designated by the environment variable
; PHPRC, and in the path that was defined in compile time (in that order).
; Under Windows, the compile-time path is the Windows directory. The
; path in which the php.ini file is looked for can be overridden using
; the -c argument in command line mode.
;
; The syntax of the file is extremely simple. Whitespace and Lines
; beginning with a semicolon are silently ignored (as you probably guessed).
; Section headers (e.g. [Foo]) are also silently ignored, even though
; they might mean something in the future.
;
; Directives are specified using the following syntax:
; directive = value
; Directive names are *case sensitive* - foo=bar is different from FOO=bar.
;
; The value can be a string, a number, a PHP constant (e.g. E_ALL or M_PI), one
; of the INI constants (On, Off, True, False, Yes, No and None) or an expression
; (e.g. E_ALL ~E_NOTICE), or a quoted string ("foo").
;
; Expressions in the INI file are limited to bitwise operators and parentheses:
; | bitwise OR
; bitwise AND
; ~ bitwise NOT
; ! boolean NOT
;
; Boolean flags can be turned on using the values 1, On, True or Yes.
; They can be turned off using the values 0, Off, False or No.
;
; An empty string can be denoted by simply not writing anything after the equal
; sign, or by using the None keyword:
;
; foo = ; sets foo to an empty string
; foo = none ; sets foo to an empty string
; foo = "none" ; sets foo to the string 'none'
;
; If you use constants in your value, and these constants belong to a
; dynamically loaded extension (either a PHP extension or a Zend extension),
; you may only use these constants *after* the line that loads the extension.
;
;
;;;;;;;;;;;;;;;;;;;
; About this file ;
;;;;;;;;;;;;;;;;;;;
; All the values in the php.ini-dist file correspond to the builtin
; defaults (that is, if no php.ini is used, or if you delete these lines,
; the builtin defaults will be identical).
;;;;;;;;;;;;;;;;;;;;
; Language Options ;
;;;;;;;;;;;;;;;;;;;;
; Enable the PHP scripting language engine under Apache.
engine = On
; Enable compatibility mode with Zend Engine 1 (PHP 4.x)
zend.ze1_compatibility_mode = Off
; Allow the <? tag. Otherwise, only <?php and <script> tags are recognized.
; NOTE: Using short tags should be avoided when developing applications or
; libraries that are meant for redistribution, or deployment on PHP
; servers which are not under your control, because short tags may not
; be supported on the target server. For portable, redistributable code,
; be sure not to use short tags.
short_open_tag = On
; Allow ASP-style <% %> tags.
asp_tags = Off
; The number of significant digits displayed in floating point numbers.
precision = 12
; Enforce year 2000 compliance (will cause problems with non-compliant browsers)
y2k_compliance = On
; Output buffering allows you to send header lines (including cookies) even
; after you send body content, at the price of slowing PHP's output layer a
; bit. You can enable output buffering during runtime by calling the output
; buffering functions. You can also enable output buffering for all files by
; setting this directive to On. If you wish to limit the size of the buffer
; to a certain size - you can use a maximum number of bytes instead of 'On', as
; a value for this directive (e.g., output_buffering=4096).
output_buffering = On
; You can redirect all of the output of your scripts to a function. For
; example, if you set output_handler to "mb_output_handler", character
; encoding will be transparently converted to the specified encoding.
; Setting any output handler automatically turns on output buffering.
; Note: People who wrote portable scripts should not depend on this ini
; directive. Instead, explicitly set the output handler using ob_start().
; Using this ini directive may cause problems unless you know what script
; is doing.
; Note: You cannot use both "mb_output_handler" with "ob_iconv_handler"
; and you cannot use both "ob_gzhandler" and "zlib.output_compression".
; Note: output_handler must be empty if this is set 'On' !!!!
; Instead you must use zlib.output_handler.
;output_handler =
; Transparent output compression using the zlib library
; Valid values for this option are 'off', 'on', or a specific buffer size
; to be used for compression (default is 4KB)
; Note: Resulting chunk size may vary due to nature of compression. PHP
; outputs chunks that are few hundreds bytes each as a result of
; compression. If you prefer a larger chunk size for better
; performance, enable output_buffering in addition.
; Note: You need to use zlib.output_handler instead of the standard
; output_handler, or otherwise the output will be corrupted.
zlib.output_compression = Off
; You cannot specify additional output handlers if zlib.output_compression
; is activated here. This setting does the same as output_handler but in
; a different order.
;zlib.output_handler =
; Implicit flush tells PHP to tell the output layer to flush itself
; automatically after every output block. This is equivalent to calling the
; PHP function flush() after each and every call to print() or echo() and each
; and every HTML block. Turning this option on has serious performance
; implications and is generally recommended for debugging purposes only.
implicit_flush = Off
; The unserialize callback function will be called (with the undefined class'
; name as parameter), if the unserializer finds an undefined class
; which should be instantiated.
; A warning appears if the specified function is not defined, or if the
; function doesn't include/implement the missing class.
; So only set this entry, if you really want to implement such a
; callback-function.
unserialize_callback_func=
; When floats doubles are serialized store serialize_precision significant
; digits after the floating point. The default value ensures that when floats
; are decoded with unserialize, the data will remain the same.
serialize_precision = 100
; Whether to enable the ability to force arguments to be passed by reference
; at function call time. This method is deprecated and is likely to be
; unsupported in future versions of PHP/Zend. The encouraged method of
; specifying which arguments should be passed by reference is in the function
; declaration. You're encouraged to try and turn this option Off and make
; sure your scripts work properly with it in order to ensure they will work
; with future versions of the language (you will receive a warning each time
; you use this feature, and the argument will be passed by value instead of by
; reference).
allow_call_time_pass_reference = On
;
; Safe Mode
;
safe_mode = Off
; By default, Safe Mode does a UID compare check when
; opening files. If you want to relax this to a GID compare,
; then turn on safe_mode_gid.
safe_mode_gid = Off
; When safe_mode is on, UID/GID checks are bypassed when
; including files from this directory and its subdirectories.
; (directory must also be in include_path or full path must
; be used when including)
safe_mode_include_dir =
; When safe_mode is on, only executables located in the safe_mode_exec_dir
; will be allowed to be executed via the exec family of functions.
safe_mode_exec_dir =
; Setting certain environment variables may be a potential security breach.
; This directive contains a comma-delimited list of prefixes. In Safe Mode,
; the user may only alter environment variables whose names begin with the
; prefixes supplied here. By default, users will only be able to set
; environment variables that begin with PHP_ (e.g. PHP_FOO=BAR).
;
; Note: If this directive is empty, PHP will let the user modify ANY
; environment variable!
safe_mode_allowed_env_vars = PHP_
; This directive contains a comma-delimited list of environment variables that
; the end user won't be able to change using putenv(). These variables will be
; protected even if safe_mode_allowed_env_vars is set to allow to change them.
safe_mode_protected_env_vars = LD_LIBRARY_PATH
; open_basedir, if set, limits all file operations to the defined directory
; and below. This directive makes most sense if used in a per-directory
; or per-virtualhost web server configuration file. This directive is
; *NOT* affected by whether Safe Mode is turned On or Off.
;open_basedir =
; This directive allows you to disable certain functions for security reasons.
; It receives a comma-delimited list of function names. This directive is
; *NOT* affected by whether Safe Mode is turned On or Off.
disable_functions =
; This directive allows you to disable certain classes for security reasons.
; It receives a comma-delimited list of class names. This directive is
; *NOT* affected by whether Safe Mode is turned On or Off.
disable_classes =
; Colors for Syntax Highlighting mode. Anything that's acceptable in
; <span style="color: ???????"> would work.
;highlight.string = #DD0000
;highlight测试数据ment = #FF9900
;highlight.keyword = #007700
;highlight.bg = #FFFFFF
;highlight.default = #0000BB
;highlight.html = #000000
; If enabled, the request will be allowed to complete even if the user aborts
; the request. Consider enabling it if executing long request, which may end up
; being interrupted by the user or a browser timing out.
; ignore_user_abort = On
;
; Misc
;
; Decides whether PHP may expose the fact that it is installed on the server
; (e.g. by adding its signature to the Web server header). It is no security
; threat in any way, but it makes it possible to determine whether you use PHP
; on your server or not.
expose_php = On
;;;;;;;;;;;;;;;;;;;
; Resource Limits ;
;;;;;;;;;;;;;;;;;;;
max_execution_time = 3000 ; Maximum execution time of each script, in seconds
max_input_time = 60 ; Maximum amount of time each script may spend parsing request data
memory_limit = 8M ; Maximum amount of memory a script may consume (8MB)
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
; Error handling and logging ;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
; error_reporting is a bit-field. Or each number up to get desired error
; reporting level
; E_ALL - All errors and warnings (doesn't include E_STRICT)
; E_ERROR - fatal run-time errors
; E_WARNING - run-time warnings (non-fatal errors)
; E_PARSE - compile-time parse errors
; E_NOTICE - run-time notices (these are warnings which often result
; from a bug in your code, but it's possible that it was
; intentional (e.g., using an uninitialized variable and
; relying on the fact it's automatically initialized to an
; empty string)
; E_STRICT - run-time notices, enable to have PHP suggest changes
; to your code which will ensure the best interoperability
; and forward compatibility of your code
; E_CORE_ERROR - fatal errors that occur during PHP's initial startup
; E_CORE_WARNING - warnings (non-fatal errors) that occur during PHP's
; initial startup
; E_COMPILE_ERROR - fatal compile-time errors
; E_COMPILE_WARNING - compile-time warnings (non-fatal errors)
; E_USER_ERROR - user-generated error message
; E_USER_WARNING - user-generated warning message
; E_USER_NOTICE - user-generated notice message
;
; Examples:
;
; - Show all errors, except for notices and coding standards warnings
;
;error_reporting = E_ALL ~E_NOTICE
;
; - Show all errors, except for notices
;
;error_reporting = E_ALL ~E_NOTICE | E_STRICT
;
; - Show only errors
;
;error_reporting = E_COMPILE_ERROR|E_ERROR|E_CORE_ERROR
;
; - Show all errors except for notices and coding standards warnings
;
error_reporting = E_ALL ~E_NOTICE
; Print out errors (as a part of the output). For production web sites,
; you're strongly encouraged to turn this feature off, and use error logging
; instead (see below). Keeping display_errors enabled on a production web site
; may reveal security information to end users, such as file paths on your Web
; server, your database schema or other information.
display_errors = On
; Even when display_errors is on, errors that occur during PHP's startup
; sequence are not displayed. It's strongly recommended to keep
; display_startup_errors off, except for when debugging.
display_startup_errors = Off
; Log errors into a log file (server-specific log, stderr, or error_log (below))
; As stated above, you're strongly advised to use error logging in place of
; error displaying on production web sites.
log_errors = Off
; Set maximum length of log_errors. In error_log information about the source is
; added. The default is 1024 and 0 allows to not apply any maximum length at all.
log_errors_max_len = 1024
; Do not log repeated messages. Repeated errors must occur in same file on same
; line until ignore_repeated_source is set true.
ignore_repeated_errors = Off
; Ignore source of message when ignoring repeated messages. When this setting
; is On you will not log errors with repeated messages from different files or
; sourcelines.
ignore_repeated_source = Off
; If this parameter is set to Off, then memory leaks will not be shown (on
; stdout or in the log). This has only effect in a debug compile, and if
; error reporting includes E_WARNING in the allowed list
report_memleaks = On
; Store the last error/warning message in $php_errormsg (boolean).
track_errors = Off
; Disable the inclusion of HTML tags in error messages.
; Note: Never use this feature for production boxes.
;html_errors = Off
; If html_errors is set On PHP produces clickable error messages that direct
; to a page describing the error or function causing the error in detail.
; You can download a copy of the PHP manual from
; and change docref_root to the base URL of your local copy including the
; leading '/'. You must also specify the file extension being used including
; the dot.
; Note: Never use this feature for production boxes.
;docref_root = "/phpmanual/"
;docref_ext = .html
; String to output before an error message.
;error_prepend_string = "<font color=ff0000>"
; String to output after an error message.
;error_append_string = "</font>"
; Log errors to specified file.
;error_log = filename
; Log errors to syslog (Event Log on NT, not valid in Windows 95).
;error_log = syslog
;;;;;;;;;;;;;;;;;
; Data Handling ;
;;;;;;;;;;;;;;;;;
;
; Note - track_vars is ALWAYS enabled as of PHP 4.0.3
; The separator used in PHP generated URLs to separate arguments.
; Default is "".
;arg_separator.output = ""
; List of separator(s) used by PHP to parse input URLs into variables.
; Default is "".
; NOTE: Every character in this directive is considered as separator!
;arg_separator.input = ";"
; This directive describes the order in which PHP registers GET, POST, Cookie,
; Environment and Built-in variables (G, P, C, E S respectively, often
; referred to as EGPCS or GPC). Registration is done from left to right, newer
; values override older values.
variables_order = "EGPCS"
; Whether or not to register the EGPCS variables as global variables. You may
; want to turn this off if you don't want to clutter your scripts' global scope
; with user data. This makes most sense when coupled with track_vars - in which
; case you can access all of the GPC variables through the $HTTP_*_VARS[],
; variables.
;
; You should do your best to write your scripts so that they do not require
; register_globals to be on; Using form variables as globals can easily lead
; to possible security problems, if the code is not very well thought of.
register_globals = On
; Whether or not to register the old-style input arrays, HTTP_GET_VARS
; and friends. If you're not using them, it's recommended to turn them off,
; for performance reasons.
register_long_arrays = On
; This directive tells PHP whether to declare the argvargc variables (that
; would contain the GET information). If you don't use these variables, you
; should turn it off for increased performance.
register_argc_argv = On
; When enabled, the SERVER and ENV variables are created when they're first
; used (Just In Time) instead of when the script starts. If these variables
; are not used within a script, having this directive on will result in a
; performance gain. The PHP directives register_globals, register_long_arrays,
; and register_argc_argv must be disabled for this directive to have any affect.
auto_globals_jit = On
; Maximum size of POST data that PHP will accept.
post_max_size = 8M
; Magic quotes
;
; Magic quotes for incoming GET/POST/Cookie data.
magic_quotes_gpc = On
; Magic quotes for runtime-generated data, e.g. data from SQL, from exec(), etc.
magic_quotes_runtime = Off
; Use Sybase-style magic quotes (escape ' with '' instead of \').
magic_quotes_sybase = Off
; Automatically add files before or after any PHP document.
auto_prepend_file =
auto_append_file =
; As of 4.0b4, PHP always outputs a character encoding by default in
; the Content-type: header. To disable sending of the charset, simply
; set it to be empty.
;
; PHP's built-in default is text/html
default_mimetype = "text/html"
;default_charset = "iso-8859-1"
; Always populate the $HTTP_RAW_POST_DATA variable.
;always_populate_raw_post_data = On
;;;;;;;;;;;;;;;;;;;;;;;;;
; Paths and Directories ;
;;;;;;;;;;;;;;;;;;;;;;;;;
; UNIX: "/path1:/patstrong"
;include_path = ".:/php/includes"
;
; Windows: "\path1;\patstrong"
include_path = ".;D:\apptools\php5\PEAR"
; The root of the PHP pages, used only if nonempty.
; if PHP was not compiled with FORCE_REDIRECT, you SHOULD set doc_root
; if you are running php as a CGI under any web server (other than IIS)
; see documentation for security issues. The alternate is to use the
; cgi.force_redirect configuration below
doc_root =
; The directory under which PHP opens the script using /~username used only
; if nonempty.
user_dir =
; Directory in which the loadable extensions (modules) reside.
extension_dir = "D:/apptools/php5/ext"
; Whether or not to enable the dl() function. The dl() function does NOT work
; properly in multithreaded servers, such as IIS or Zeus, and is automatically
; disabled on them.
enable_dl = On
是什么意思'>php->是什么意思一、=>,->的意思：
->是对象执行方法或取得属性用的。
=>是数组里键和值对应用的。
二、用法
1、=> 的用法数组中用于数组的?key?和?value之间的关系例如：
$a?=?array('0'?=>?'1','2'?=>?'4',);echo?$a['0'];echo?$a['2'];
2、-> 的用法类中用于引用类实例的方法和属性例如：
class?Test{function?add(){return?$this->var++;}var?$var?=?0;}$a?=?new?Test;
//实例化对象名称
echo?$a->add();echo?$a->var;
扩展资料
PHP中->代码如下：
<?php
class Car {
public $speed = 0;
//增加speedUp方法，使speed加10
public function speedUp(){
$this->speed+=10;
}
}
$car = new Car();
$car->speedUp();
echo $car->speed;
?>
PHP中=>代码如下：
<?php
//从数组变量$arr中，读取键为apple的值
$arr = array('apple'=>"苹果",'banana'=>"香蕉",'pineapple'=>"菠萝");
$arr0=$arr["apple"];
if( isset($arr0) )
{print_r($arr0);
}
?>
参考资料来源：百度百科 - PHP （超文本预处理器）
百度百科 - PHP运算符
学习PHP要从哪开始？PHP需要掌握的知识还是比较多的，最基本的比如：PHP基本的语法、php框架以及CMS、mysql数据库设计表、mysql数据库的基本SQL语句。现在一般PHP的都得会前端，那就包括：js/ajax、html、css。如果更高点层次的就是linux服务器。
PHP攻城狮践行学习路线图：
1、用集成环境安装PHP环境，一定要记住这一点，不要自己分开去装，尤其是自学的朋友。不然你会觉得很复杂，会没有信心学下去的。也要注意任何高手都不是一蹴而就的，是一步一步，不同的阶段历练才有最后的沉淀。
2、先了解一些基本的变量类型，语法，函数，基本逻辑，写简单的代码。前期以尝试，培养兴趣为主。这段时间是打基础很好的时候，这个会影响你后面的发展，不过也可以在后期去完善。
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4、这些都感觉有80%了解就可以先放放了，现在在学习MySQL，也是先了解基础的。这个是干什么的，我可以用它做什么。因为之前装的集成环境。为什么感觉是凌乱的，我想告诉你的是，一是不要在自己没能力解决问题的时候死磕，浪费时间，丧失信心。这时候我们要做的是学习壮大自己，不要灰心。二是我本来觉得这一切都了解才是完整的。我们的目标也是要把这些都做好，这才是一个合格的PHP程序员。
5、这一切都顺利的话，你基本离预设的目标不远了，完成了整个学习的70%了。后面的是在之前的基础上升华。把HTML和css、js结合、静态文件和PHP结合、PHP和MySQL结合。这个阶段可能越到的问题会异常的多，一定要学会解决问题。网上很多都是答案，同样你要学会问问题。
6、这些之后你基本已经快到学习的尾声了，但还缺少经验。这时，你可以看一些网上开源的cms，例如织梦，国内用的多，越到问题好解决。看看一些视频（网上免费的很多），查漏补缺，总结归纳形成自己的知识体系。是时候该准备庆祝下自己这段的时间没有白费（一般2到3各月，看平时每天花的时间），基本成为一个合格的PHP程序员了。也该恭喜你了，其实并不那么难。坚持，坚持；努力，努力；学习，学习
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