PHP - Manual手册 - 函数参考 - PHP Options&Information - PHP选项与信息 - dl运行时加载PHP扩展

PHP - Manual手册 - 函数参考 - PHP Options&Information - PHP选项与信息 - dl运行时加载PHP扩展

dl

(PHP 4, PHP 5)dl — Loads a PHP extension at runtime

说明

int [b]dl[/b] ( string $library )Loads the PHP extension given by the parameter library .Use extension_loaded() to test whether a given extension is already available or not. This works on both built-in extensions and dynamically loaded ones (either through php.ini or dl()).

参数

library This parameter is only the filename of the extension to load which also depends on your platform. For example, the sockets extension (if compiled as a shared module, not the default!) would be called sockets.so on Unix platforms whereas it is called php_sockets.dll on the Windows platform.The directory where the extension is loaded from depends on your platform:Windows - If not explicitly set in the php.ini, the extension is loaded from c:/php4/extensions/ by default.Unix - If not explicitly set in the php.ini, the default extension directory depends on whether PHP has been built with --enable-debug or not
whether PHP has been built with (experimental) ZTS (Zend Thread Safety) support or not
the current internal ZEND_MODULE_API_NO (Zend internal module API number, which is basically the date on which a major module API change happened, e.g. 20010901)
Taking into account the above, the directory then defaults to /lib/php/extensions/ --ZEND_MODULE_API_NO, e.g. /usr/local/php/lib/php/extensions/debug-non-zts-20010901 or /usr/local/php/lib/php/extensions/no-debug-zts-20010901.

返回值

如果成功则返回 TRUE，失败则返回 FALSE。 If the functionality of loading modules is not available (see Note) or has been disabled (either by turning it off enable_dl or by enabling 安全模式 in php.ini) an E_ERROR is emitted and execution is stopped. If dl() fails because the specified library couldn't be loaded, in addition to FALSE an E_WARNING message is emitted.

范例

Example#1 [b]dl() examples[/b]

// Example loading an extension based on OS

if (!extension_loaded('sqlite')) {

    if (strtoupper(substr(PHP_OS, 0, 3)) === 'WIN') {

        dl('php_sqlite.dll');

    } else {

        dl('sqlite.so');

    }

}


// Or, the PHP_SHLIB_SUFFIX constant is available as of PHP 4.3.0

if (!extension_loaded('sqlite')) {

    $prefix = (PHP_SHLIB_SUFFIX === 'dll') ? 'php_' : '';

    dl($prefix . 'sqlite.' . PHP_SHLIB_SUFFIX);

}

?>
 
 
 注释 
Note: dl() is not supported in multithreaded Web servers. Use the extensions statement in your php.ini when operating under such an environment. However, the CGI and CLI build are not affected !

Note: As of PHP 5, the dl() function is deprecated in every SAPI except CLI. Use Extension Loading Directives method instead.

Note: Since PHP 6 this function is disabled in all SAPIs, except CLI, CGI and embed.

Note: dl() is case sensitive on Unix platforms.

Note: 本函数在安全模式下被禁用。
 参见 
Extension Loading Directives
extension_loaded()
 
 
 [dl运行时加载PHP扩展 - 文档] 
http://www.php.net/manual/zh/function.dl.php
 [PHP - 官方网站] 
http://www.php.net/
 [PHP - 关键词] 
php
 [PHP - 相关论坛] 
http://php.board.newsmth.net/
http://bbs.pku.edu.cn/, homepage看版
http://forum.csdn.net/SList/PHP/
 [PHP - 下载] 
AppServ 2.5.9, http://www.appservnetwork.com/ Zend Optimizer 3.3.0a, http://www.zend.com/products/zend_optimizer 
phpMyAdmin 2.11.2, http://www.phpmyadmin.net/home_page/index.php Zend Core 2.5.0, http://www.zend.com/products/zend_core Zend Platform 3.0.3, http://www.zend.com/products/zend_platform PHP 5.2.5, http://www.php.net/releases/5_2_5.php Zend Studio 5.5, http://www.zend.com/products/zend_studio Zend Guard 5.0, http://www.zend.com/products/zend_guard 
 [PHP - Manual手册] 
foreach遍历数组, http://www.php.net/manual/zh/control-structures.foreach.php SOAP configuration options missing documentation文档中丢失SOAP配置选项, http://bugs.php.net/bug.php?id=38644 PHP 的命令行模式, http://www.php.net/manual/zh/features.commandline.php 位运算符, http://www.php.net/manual/zh/language.operators.bitwise.php#id2665181 file_exists检查文件或目录是否存在, http://www.php.net/manual/zh/function.file-exists.php  
is_file判断给定文件名是否为一个正常的文件, http://www.php.net/manual/zh/function.is-file.php  

settype设置变量的类型, http://cn.php.net/manual/zh/function.settype.php#function.settype is_numeric检测变量是否为数字或数字字符串, http://www.php.net/manual/zh/function.is-numeric.php ksort对数组按照键名排序, http://www.php.net/manual/zh/function.ksort.php 
 [PHP - Manual手册 - 下载] 
http://www.php.net/download-docs.php
 [PHP - Manual手册 - 语言参考 - 类型] 
字符串转换为数值, http://www.php.net/manual/zh/language.types.string.php#language.types.string.conversion 
 [PHP - Manual手册 - 第 12 章 变量] 
全局和静态变量的引用, http://www.php.net/manual/zh/language.variables.scope.php#language.variables.scope.references 
 [PHP - Manual手册 - 第 13 章 常量] 
魔术常量, http://www.php.net/manual/zh/language.constants.predefined.php 
 [PHP - Manual手册 - 第 15 章 运算符] 
错误控制运算符, http://www.php.net/manual/zh/language.operators.errorcontrol.php 
 [PHP - Manual手册 - 语言参考 - 类与对象（PHP 5）] 
Object cloning对象克隆, http://www.php.net/manual/zh/language.oop5.cloning.php Class Abstraction类抽象, http://www.php.net/manual/zh/language.oop5.abstract.php 
 [PHP - Manual手册 - 第20章 异常处理] 
概述, http://www.php.net/manual/zh/language.exceptions.php 
用异常处理php改进流程

 [PHP - Manual手册 - 第21章 引用的解释] 
引用返回, http://www.php.net/manual/zh/language.references.return.php 
 [PHP - Manual手册 - 第 43 章 PHP 的命令行模式] 
表 43.2. CLI 专用常量, http://www.php.net/manual/zh/features.commandline.php#id2715646 
 [PHP - Manual手册 - V. Array 数组函数] 
计算数组的交集, http://www.php.net/manual/zh/function.array-intersect.php array_merge合并一个或多个数组, http://www.php.net/manual/zh/function.array-merge.php 
reset将数组的内部指针指向第一个单元, http://www.php.net/manual/zh/function.reset.php 
 [PHP - Manual手册 - XVIII. CURL, 客户端URL库函数] 
概述, http://www.php.net/manual/zh/ref.curl.php curl_setopt设置cURL传输的选项, http://www.php.net/manual/zh/function.curl-setopt.php 
 [PHP - Manual手册 - XXII. Date/Time 日期／时间函数] 
date格式化一个本地时间／日期, http://www.php.net/manual/zh/function.date.php
 [PHP - Manual手册 - XXXIII. Error Handling and Logging Functions错误处理和日志函数] 
概述, http://www.php.net/manual/zh/ref.errorfunc.php 
 [PHP - Manual手册 - XL. Filesystem 文件系统函数]
is_uploaded_file判断文件是否是通过 HTTP POST 上传的, http://www.php.net/manual/zh/function.is-uploaded-file.php 
fgetcsv从文件指针中读入一行并解析 CSV 字段, http://www.php.net/manual/zh/function.fgetcsv.php is_dir判断给定文件名是否是一个目录, http://www.php.net/manual/zh/function.is-dir.php 
 [PHP - Manual手册 - XLVII. Function Handling Functions函数管理函数] 
register_shutdown_function注册一个脚本结束时调用的函数, http://www.php.net/manual/zh/function.register-shutdown-function.php 
 [PHP - Manual手册 - XC. Miscellaneous Functions杂项函数] 
sleep延迟执行, http://www.php.net/manual/zh/ref.misc.php uniqid生成唯一ID, http://www.php.net/manual/zh/function.uniqid.php 
 [PHP - Manual手册 - XCVIII. MySQL 函数]
 
mysql_real_escape_string转义SQL语句中使用的字符串中的特殊字符，并考虑到连接的当前字符集, http://www.php.net/manual/zh/function.mysql-real-escape-string.php 
 [PHP - Manual手册 - CII. Network Functions网络函数] 
setcookie发送一个cookie, http://www.php.net/manual/zh/function.setcookie.php 
 [PHP - Manual手册 - 函数参考 - PHP Options&Information - PHP选项与信息] 
extension_loaded查询是否加载指定的扩展, http://www.php.net/manual/zh/function.extension-loaded.php dl运行时加载PHP扩展, http://www.php.net/manual/zh/function.dl.php 
 [PHP - Manual手册 - CXXVII. PostgreSQL 数据库函数] 
pg_insert将数组插入到表中, http://www.php.net/manual/zh/index.php
 [PHP - Manual手册 - CXXX. Program Execution Functions程序调用函数] 
proc_open执行命令并打开用于输入输出的文件指针, http://www.php.net/manual/zh/function.proc-open.php 
 [PHP - Manual手册 - CXLIX. Session 会话处理函数] 
session.save_path 定义了传递给存储处理器的参数, http://www.php.net/manual/zh/ref.session.php#ini.session.save-path session.use_only_cookies指定是否在客户端仅仅使用 cookie 来存放会话 ID, http://www.php.net/manual/zh/ref.session.php#ini.session.use-only-cookies 
 [PHP - Manual手册 - CLIII. SOAP Functions - SOAP函数] 
soap.wsdl_cache_enabled启用或禁用WSDL缓存功能, http://www.php.net/manual/zh/ref.soap.php#ini.soap.wsdl-cache-enabled 
 [PHP - Manual手册 - CLXI. String 字符串处理函数] 
str_pad使用另一个字符串将一个字符串填充到指定长度, http://www.php.net/manual/zh/function.str-pad.php strpos查找一个字符串第一次出现的位置, http://www.php.net/manual/zh/function.strpos.php substr返回字符串中的一部分, http://www.php.net/manual/zh/function.substr.php 
str_replace用替换字符串替换所有出现的搜索字符串, http://www.php.net/manual/zh/function.str-replace.php 
 [PHP - Manual手册 - CLXVI. Tidy Functions - Tidy函数] 
概述, http://www.php.net/manual/zh/ref.tidy.php 
 [PHP - Manual手册 - CLXVII. Tokenizer Functions解析器代号函数] 
token_get_all把给定源代码分解成解析器代号, http://www.php.net/manual/zh/function.token-get-all.php 
 [PHP - Manual手册 - CLXIX. URL 函数] 
概述, http://www.php.net/manual/zh/ref.url.php 
 [PHP - Manual手册 - CLXX. Variable 变量函数] 
serialize产生一个可存储的值的表示, http://www.php.net/manual/zh/function.serialize.php 
 [PHP - Manual手册 - CLXXXVII. Zip File Functions - Zip文件压缩函数] 
概述, http://www.php.net/manual/zh/ref.zip.php
 [PHP - Manual手册 - 附录 H. php.ini 配置选项] 
register_globals 决定是否将 EGPCS（Environment，GET，POST，Cookie，Server）变量注册为全局变量, http://www.php.net/manual/zh/ini.core.php#ini.register-globals short_open_tag决定是否允许使用PHP代码开始标志的缩写形式, http://www.php.net/manual/zh/ini.core.php#ini.short-open-tag 
 [PHP - Manual手册 - 附录 L. 保留字列表] 
服务器变量：$_SERVER, http://www.php.net/manual/zh/reserved.variables.php#reserved.variables.server 
 [PHP - Manual手册 - 附录 Q. PHP 类型比较表] 
表 Q.2. 用 == 进行松散比较, http://www.php.net/manual/zh/types.comparisons.php#id9240444 
 [PHP - 应用实例]
语法着色, php.exe -s "%1" > "%1.html"

移除SimpleXML对象中的子对象

算24点