PHP file reading fread, fgets, fgetc, file_get_contents and file function usage example code

fread(), fgets(), fgetc(),file_get_contents() and file() functions are used to read content from files.

fread()

fread() function is used toread files(safe for use with binary files).

Syntax:

string fread( int handle, int length )

fread() Reads up to length bytes from the file pointer handle. Reading of the file will stop when any of the following conditions are encountered:

• When up to length bytes have been read

• When the end of file (EOF) is reached

• (for network streams) when a packet is available

• or (when opening a userspace stream After) 8192 bytes have been read

Read 10 bytes from the file (including spaces):

Tip

If you just want to read the contents of a file into astring, you should use file_get_contents() with better performance.

fgets()

fgets() function is used to readone lineof data from the file and point the file pointer to the next line.

Tip: If you want to remove the HTML tags in the file when reading, please use thefgetss() function.

Syntax:

string fgets( int handle [, int length] )

fgets() Reads a line from the file pointed to by handle and returns a string with a length of at most length-1 bytes. Stops on a newline character (included in the return value), EOF, or after length-1 bytes have been read. If length is not specified, it defaults to 1K, or 1024 bytes.

Example:

'; } } fclose($fh); ?>

Supplementary instructions

feof() function tests whether the file pointer reaches the end of the file. The file pointer must be valid. If it is an invalid resource, then Will get stuck in an infinite loop. See "PHP File Pointer Function"

fgetc()

fgetc() function is used to read file dataword by worduntil the end of the file.

语法：

string fgetc( resource handle )

例子：

file_get_contents()

file_get_contents() 函数用于把整个文件读入一个字符串，成功返回一个字符串，失败则返回 FALSE。

语法：

string file_get_contents( string filename [, int offset [, int maxlen]] )

例子：

 echo nl2br(file_get_contents('data.txt')); ?>

file()

file() 函数用于把整个文件读入一个数组中，数组中的每个单元都是文件中相应的一行，包括换行符在内。成功返回一个数组，失败则返回 FALSE。

语法：

array file( string filename )

例子：

 $line) { echo "Line #{$line_num} : ",$line,'
'; } ?>

test.txt 文件内容：

你好！ 这是第二行文字。

浏览器显示：

Line #0 : 你好！ Line #1 : 这是第二行文字。

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