Five ways to read file content in PHP, _PHP tutorial-PHP Tutorial-php.cn

Five ways to read file content in PHP, _PHP tutorial

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Release： 2016-07-12 09:02:18

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Five ways to read file content in PHP,

Five ways to read file content in PHP

Share five ways to read file contents in PHP: Well, after writing, I found that all the files were not closed. In actual application, please pay attention to closing fclose($fp);
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php reads file content:

-----First method-----fread()--------

<&#63;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);
}
&#63;>

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

<&#63;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;
}
&#63;>

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-----Third method------------

<&#63;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;
}
&#63;>

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

<&#63;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 />";
}*/
}
&#63;>

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

<&#63;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;
}
&#63;>

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