There are two ways to read files in PHP: file_get_contents and fread (with code examples)

This article mainly talks about the two ways to read files in php: fread and file_get_contents, and this The two are also reading files, what are the similarities and differences between the two.

1. The syntax of the two functions:

fread()

fread    ( resource $handle   , int $length   ) : string

• $handle : File system pointer, generally resource (resource) created by fopen().

• $length: Read the byte length of the file.
  

• Return value: A string of $length length.

file_get_contents()

file_get_contents ( string $filename ,bool $include_path=false ,resource $context =? ,int $offset = -1 , int $maxlen = ? ) : string

• $filename: The name of the file to be read.

• $include_path: If you need to search for files in include_path (in php.ini), please set this parameter to '1'.

• $context: Specifies the environment of the file handle. context is a set of options that can modify the behavior of the stream. If null is used, it is ignored.

• $offset: Specifies the position in the file to start reading. This parameter was added in PHP 5.1.

• $maxlen: Specifies the number of bytes to read

• Return value: A string of length $maxlen.

#2. The difference between the two:

fread() needs to be read through a pointer To get the content, you can read the content according to the size size

<?php
  //文件路径
  $filename="./exit.txt";
  //获取文件资源
  $file = fopen($filename,&#39;r&#39;); //读取二进制文件时，需要将第二个参数设置成&#39;rb&#39;
  //获取文件内容
  $file_info=fread($file,10);
  //打印文件内容
  echo $file_info;
  //关闭文件资源
    fclose($file);
?>

输出：php good b

file_get_contents ()Read all the content directly

<?php
  //文件路径
  $filename="./exit.txt";
  echo file_get_contents($filename);
?>

输出：php good better Knowledge is power

fread()If you want to obtain the entire content, you need to use the filesize() function to return the size of the specified file.

  $file_info=fread($file,filesize($filename));

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