Summary of five methods for reading files in PHP-PHP Tutorial-php.cn

Summary of five methods for reading files in PHP

伊谢尔伦

Release： 2023-03-11 08:06:02

Original

1810 people have browsed it

Introduces the method of php reading the contents of the file , summarizes the five methods of php reading the contents of the file. In actual applications, please pay attention to closing fclose($fp);

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));//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);
}
?>

Copy after login

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;
}
?>

Copy after login

Three methods:

<?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;
}
?>

Copy after login

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 />";
 }*/
}
?>

Copy after login

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;
}
?>

Copy after login

The above is the detailed content of Summary of five methods for reading files in PHP. For more information, please follow other related articles on the PHP Chinese website!