Summary of five ways to read file content in php

How PHP reads and writes files

PHP reads and writes files, just like using FSO in ASP to read and write files. Of course, in ASP FSO can only read and write files on the server disk running the current program (obviously you need to obtain the physical path), but PHP can open files for reading and writing through FTP or HTTP.

How does PHPread files

PHP reading files can read files in the current server or remote server. The steps are: open the file, read the file and close the file.

This article mainly introduces five ways for php to read file content

php reads file content:

-----Chapter One method-----fread()--------

<?php
$file_path = "test.txt";
if(file_exists($file_path)){
$fp = fopen($file_path,"r");
$str = fread($fp,filesize($file_path));//指定读取大小，这里把整个文件内容读取出来
echo $str = str_replace("\r\n","<br />",$str);
}
?>

--------The second method ------------

<?php
$file_path = "test.txt";
if(file_exists($file_path)){
$str = file_get_contents($file_path);//将整个文件内容读入到一个字符串中
$str = str_replace("\r\n","<br />",$str);
echo $str;
}
?>

-----The third method---------- --

<?php
$file_path = "test.txt";
if(file_exists($file_path)){
$fp = fopen($file_path,"r");
$str = "";
$buffer = 1024;//每次读取 1024 字节
while(!feof($fp)){//循环读取，直至读取完整个文件
$str .= fread($fp,$buffer);
} 
$str = str_replace("\r\n","<br />",$str);
echo $str;
}
?>

-------The fourth method--------------

<?php
$file_path = "test.txt";
if(file_exists($file_path)){
$file_arr = file($file_path);
for($i=0;$i<count($file_arr);$i++){//逐行读取文件内容
echo $file_arr[$i]."<br />";
}
/*
foreach($file_arr as $value){
echo $value."<br />";
}*/
}
?>

----The fifth method--------------------

<?php
$file_path = "test.txt";
if(file_exists($file_path)){
$fp = fopen($file_path,"r");
$str ="";
while(!feof($fp)){
$str .= fgets($fp);//逐行读取。如果fgets不写length参数，默认是读取1k。
}
$str = str_replace("\r\n","<br />",$str);
echo $str;
}
?>

In actual application, please pay attention to closing fclose($fp);

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