define():

用法

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str_replace(find,replace,string,count)

使用方法

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header()

www.smsyun.com/home-index-page-id-280.html

php.net/manual/zh/function.header.php

www.smsyun.com/home-index-page-id-184.html

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isset()

判断变量是否已经被分配的内存，注意null也是被分配内存了。

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ini_set();

代码里设置php.ini文件的值。

http://www.jb51.net/article/45326.htm

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clearstatcache(void)

www.t086.com/code/php/function.php-clearstatcache.php

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$_SERVER

http://php.net/manual/zh/reserved.variables.server.php

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is_array()

—检测变量是否是数组

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array_merge()

合并一个或多个数组

php.net/manual/zh/function.array-merge.php

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array_slice()  分割字符串。

php.net/manual/zh/function.array-slice.php

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extract();

php.net/manual/zh/function.extract.php

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function dirname($path,$levels=1) {}

php.net/manual/en/function.dirname.php

这个函数其实是返回上一级目录。

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file_exists();

Checks whether a file or directory exists

www.cnblogs.com/baochuan/archive/2012/05/06/2445822.html

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include()

php.net/manual/zh/function.include.php

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function_exists();

Return true if the given function has been define

php.net/manual/en/function.function-exists.php

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date_default_timezone_get()

php.net/manual/zh/function.date-default-timezone-get.php

获取运行脚本时的时区代码。

is_array—检测变量是否是数组

array_merge

array_slice

extract

functionbasename($path,$suffix=null) {}

http://www.cnblogs.com/baochuan/archive/2012/05/06/2445822.html

http://php.net/manual/zh/function.include.php

function_exists

date_default_timezone_get

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