Five ways to read file content in PHP

-----The first method-----fread()-------

<?php
$file_path = "test.txt";
if(file_exists($file_path)){
$fp = fopen($file_path,"r");
$str = fread($fp,filesize($file_path)); // Specify the read size, here read the entire file content 
echo $str = str_replace( " \r\n " , " <br /> " , $str);
fclose($fp);
}
?>

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

<?php
$file_path = "test.txt";
if(file_exists($file_path)){
$str = file_get_contents($file_path); // Read the entire file contents into a string 
$str = str_replace( " \r\n " , " <br /> " ,$str);
echo $str;
}
?>

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

<?php
$file_path = "test.txt";
if(file_exists($file_path)){
$fp = fopen($file_path,"r");
$str = "";
$buffer = 1024 ; // Read 1024 bytes each time 
while (!feof($fp)){ // Read in a loop until the entire file is read 
$str .= fread($fp,$buffer);
}
$str = str_replace("\r\n","<br />",$str);
echo $str;
fclose($fp);
}
?>

-------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++){ // Read the file content line by line 
echo $file_arr[$i]. " <br /> " ;
fclose($file_arr);
}
/*
foreach($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); // Read line by line. If fgets does not write the length parameter, the default is to read 1k. 
}
$str = str_replace("\r\n","<br />",$str);
echo $str;
fclose($fp);
}
?>

All five methods must remember to close the file fclose($fp);

Reprinted to http://www.jb51.net/article/77067.htm