fgetc()

(PHP 4, PHP 5, PHP 7)

从文件指针中读取字符

说明

从文件句柄中获取一个字符。

参数

文件指针必须是有效的，必须指向由fopen()或fsockopen()成功打开的文件(并还未由fclose()关闭)。

返回值

返回一个包含有一个字符的字符串，该字符从$handle指向的文件中得到。碰到 EOF 则返回FALSE。

此函数可能返回布尔值FALSE，但也可能返回等同于FALSE的非布尔值。请阅读布尔类型章节以获取更多信息。应使用===运算符来测试此函数的返回值。

范例

一个fgetc()例子

注释

Note:此函数可安全用于二进制对象。

参见

• fread() 读取文件（可安全用于二进制文件）
• fopen() 打开文件或者 URL
• popen() 打开进程文件指针
• fsockopen() 打开一个网络连接或者一个Unix套接字连接
• fgets() 从文件指针中读取一行

The best and simplest way to get input from a user in the CLI with only PHP is to use fgetc() function with the STDIN constant: 

I was using command-line PHP to create an interactive script and wanted the user to enter just one character of input - in response a Yes/No question. Had some trouble finding a way to do so using fgets(), fgetc(), various suggestions using readline(), popen(), etc. Came up with the following that works quite nicely:
$ans = strtolower( trim( `bash -c "read -n 1 -t 10 ANS ; echo \\\$ANS"` ) );

To read a single key-press in CLI mode, you can either use ncurses (which will probably require additional modules for PHP) or get nasty with the *nix "/bin/stty" command) 

You can't just simple print separated characters of a text which is encoded in multibyte character set like this;
Because fgetc() will break each multibyte character on its every byte. Consider this example: 

I don't think this is the best, but it can be a workaround:

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