(PHP 4, PHP 5)
extension_loaded — Find out whether an extension is loaded
Finds out whether the extension is loaded.
name
The extension name.
You can see the names of various extensions by using phpinfo() or if you're using the CGI or CLI version of PHP you can use the -m switch to list all available extensions:
$ php -m[PHP Modules]xmltokenizerstandardsocketssessionposixpcreoverloadmysqlmbstringctype[Zend Modules]Returns TRUE if the extension identified by name is loaded, FALSE otherwise.
Example#1 extension_loaded() example
if (!extension_loaded('gd')) { if (!dl('gd.so')) { exit; } } ?>Note: extension_loaded() uses the internal extension name to test whether a certain extension is available or not. Most internal extension names are written in lower case but there may be extension available which also use uppercase letters. Be warned that this function compares case sensitive !
get_loaded_extensions() get_extension_funcs() phpinfo() dl()
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
Class Abstraction类抽象, http://www.php.net/manual/zh/language.oop5.abstract.php
foreach遍历数组, http://www.php.net/manual/zh/control-structures.foreach.phpSOAP 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
字符串转换为数值, http://www.php.net/manual/zh/language.types.string.php#language.types.string.conversion
全局和静态变量的引用, http://www.php.net/manual/zh/language.variables.scope.php#language.variables.scope.references
魔术常量, http://www.php.net/manual/zh/language.constants.predefined.php
错误控制运算符, http://www.php.net/manual/zh/language.operators.errorcontrol.php
概述, http://www.php.net/manual/zh/language.exceptions.php
用异常处理php改进流程
引用返回, http://www.php.net/manual/zh/language.references.return.php
表 43.2. CLI 专用常量, http://www.php.net/manual/zh/features.commandline.php#id2715646
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
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
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
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
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
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
setcookie发送一个cookie, http://www.php.net/manual/zh/function.setcookie.php
extension_loaded查询是否加载指定的扩展, http://www.php.net/manual/zh/function.extension-loaded.php
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
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
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
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
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
serialize产生一个可存储的值的表示, http://www.php.net/manual/zh/function.serialize.php
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
服务器变量:$_SERVER, http://www.php.net/manual/zh/reserved.variables.php#reserved.variables.server
表 Q.2. 用 == 进行松散比较, http://www.php.net/manual/zh/types.comparisons.php#id9240444
语法着色, php.exe -s "%1" > "%1.html"
移除SimpleXML对象中的子对象
算24点