PHP大小写是否敏感问题
一、大小写敏感
1. 变量名区分大小写
所有变量均区分大小写,包括普通变量以及$_GET,$_POST,$_REQUEST,$_COOKIE,$_SESSION,$GLOBALS,$_SERVER,$_FILES,$_ENV等;
2. 常量名默认区分大小写,通常都写为大写
3. php.ini配置项指令区分大小写
如 file_uploads = 1 不能写成 File_uploads = 1
二、大小写不敏感
1. 函数名、方法名、类名 不区分大小写,但推荐使用与定义时相同的名字
2. 魔术常量不区分大小写,推荐大写
包括:__LINE__、__FILE__、__DIR__、__FUNCTION__、__CLASS__、__METHOD__、__NAMESPACE__。
3. NULL、TRUE、FALSE不区分大小写
4.类型强制转换,不区分大小写
包括
- (int),(integer) – 转换成整型
- (bool),(boolean) – 转换成布尔型
- (float),(double),(real) – 转换成浮点型
- (string) – 转换成字符串
- (array) – 转换成数组
- (object) – 转换成对象
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)
文章转自:http://www.4wei.cn/archives/1001310