How does PHP realize the function of reading files and supporting remote files?

This article mainly explains "how PHP can read files and support remote file functions", interested friends may wish to take a look. The method introduced in this paper is simple, fast and practical. Let's take you to learn "PHP how to read files and support remote file functions"!

php reads files

case one

The copy code is as follows:

fopen() Binds a named resource specified by file to a stream.

filesize Returns the number of bytes of the file size or FALSE if an error occurs.

Note: Because PHP integer types are signed, and most platforms use 32-bit integers, the filesize() function may return unexpected results if it encounters files larger than 2 GB. For files between 2 GB and 4 GB, sprintf ('% u', filesize($file)) is usually used to overcome this problem.

fread() reads up to length bytes from file pointer handle. This function stops reading the file when length bytes are read, or EOF is reached, or (for network flows) when a packet is available, depending on which is encountered first.

Description: Low version usage! php5 file_get_contents

case two

The copy code is as follows:

file --reads the entire file into an array

description

Read binary files

case III

The copy code is as follows:

file_get_contents --reads an entire file into a string

description

string file_get_contents ( string filename [, int use_include_path [, resource context]])

Same as file(), except file_get_contents() returns the file as a string.

The file_get_contents() function is the preferred method for reading the contents of a file into a string. Memory mapping techniques are also used to enhance performance if supported by the operating system.

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