Home Backend Development PHP Tutorial Reading and writing files in PHP_PHP tutorial

Reading and writing files in PHP_PHP tutorial

Jul 13, 2016 am 10:55 AM
fopen fwrite php two function exist document have Compare use Read and write

There are two more practical functions for reading and writing files in php, fopen and fwrite. With these two functions, you can operate files very well. If you need it, you can read the detailed explanation.

1.fopen (create files and open files)

Syntax:

fopen(filename,mode)filename, specifies the file to be opened. mode, the mode for opening the file. Possible values ​​are shown in the table below.

mode description
"r" opens in read-only mode, pointing the file pointer to the beginning of the file.
"r+" opens in read-write mode and points the file pointer to the beginning of the file.
"w" turns on writing mode, points the file pointer to the beginning of the file and truncates the file size to zero. If the file does not exist then attempts to create it.
"w+" opens in read-write mode, points the file pointer to the beginning of the file and truncates the file size to zero. If the file does not exist then attempts to create it.
"a" opens in writing mode and points the file pointer to the end of the file. If the file does not exist then attempts to create it.
"a+" opens in read-write mode and points the file pointer to the end of the file. If the file does not exist then attempts to create it.

If the file is successfully opened, the return value of the fopen function is a file pointer. If an error occurs, FALSE is returned.

Example:

The code is as follows Copy code
代码如下 复制代码
$fp = fopen("test.txt", "r");
?>
$fp = fopen("test.txt", "r");

?>

2.fclose (close file)

Syntax:

fclose(filepointer)

filepointer, the file pointer to be closed. The fclose function returns TRUE if successful and FALSE if failed.

 代码如下 复制代码
$fp = fopen("test.txt", "r");
fclose($fp);
?>
Example:

The code is as follows Copy code
$fp = fopen("test.txt", "r");

fclose($fp);

?>


3.feof (check whether the end of file has been reached)

Syntax:

 代码如下 复制代码
$fp = fopen("test.txt", "r");
while(! feof($fp))
{
echo fgets($fp). "
";
}
fclose($fp);
?>
feof(filepointer)

filepointer, the file pointer to be detected, which must point to a file that was successfully opened but not closed. If the file pointer reaches the end of the file or an error occurs, the feof function returns TRUE.

Example:

The code is as follows Copy code
$fp = fopen("test.txt", "r");
while(! feof($fp))

{

echo fgets($fp). "
"; }

 代码如下 复制代码
$fp = fopen("test.txt", "r");
if($fp)
{
for($i=1;! feof($fp);$i++)
{
echo "行".$i." : ".fgets($fp). "
";
 }
}
else
{
 echo "打开文件失败";
}
fclose($fp);
?>
fclose($fp); ?>
4.fgets (read a line from the file pointer) Syntax: fgets(filepointer) filepointer, the file pointer to be read. Reads a line from the file and returns a string if successful, or FALSE if failed. Example:
The code is as follows Copy code
$fp = fopen("test.txt", "r");<🎜> if($fp)<🎜> {<🎜> for($i=1;! feof($fp);$i++)<🎜> {<🎜> echo "OK".$i." : ".fgets($fp). "
"; } } else { echo "Failed to open file"; } fclose($fp); ?>

Suppose the content of test.txt is:

hello world
hello cnblogs
hello heihaozi
hello everyone
The page output result is:

Line 1: hello world
Line 2: hello cnblogs
Line 3: hello heihaozi
Line 4: hello everyone5.fwrite (write file)

Syntax:

fwrite(filepointer,string) filepointer, the file pointer to be written. string, the string to be written. Returns the number of characters written if successful, or FALSE if failed.

Example:

$count+=$flag; }
The code is as follows
 代码如下 复制代码
$fp = fopen("test.txt", "w");//文件被清空后再写入
if($fp)
{
$count=0;
for($i=1;$i<=5;$i++)
{
$flag=fwrite($fp,"行".$i." : "."Hello World!rn");
if(!$flag)
{
echo "写入文件失败
";
   break;
  }
  $count+=$flag;
 }
 echo "共写入".$count."个字符";
}
else
{
 echo "打开文件失败";
}
fclose($fp);
?>
Copy code

$fp = fopen("test.txt", "w");//The file is cleared and then written
if($fp)

{

$count=0;
for($i=1;$i<=5;$i++)
{
$flag=fwrite($fp,"OK".$i." : "."Hello World!rn");
if(!$flag)
{

echo "Failed to write file
";

Break;

}
echo "A total of ".$count." characters written"; }

else

{ } fclose($fp); ?> The output result of the page is: Write a total of 100 characters The test.txt file will be written:
Line 1: Hello World! Line 2: Hello World!
Line 3: Hello World!
Line 4: Hello World! Line 5: Hello World! ​ Note: In order to simplify the operation, the optional parameters of some functions are not listed. http://www.bkjia.com/PHPjc/632264.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/632264.htmlTechArticleThere are two more practical functions for reading and writing files in php, fopen and fwrite functions. It is good to have both of them. The file has been operated. If necessary, you can read the detailed explanation. 1.fopen (create file...
Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn

Hot AI Tools

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Undress AI Tool

Undress AI Tool

Undress images for free

Clothoff.io

Clothoff.io

AI clothes remover

AI Hentai Generator

AI Hentai Generator

Generate AI Hentai for free.

Hot Article

R.E.P.O. Energy Crystals Explained and What They Do (Yellow Crystal)
2 weeks ago By 尊渡假赌尊渡假赌尊渡假赌
Repo: How To Revive Teammates
4 weeks ago By 尊渡假赌尊渡假赌尊渡假赌
Hello Kitty Island Adventure: How To Get Giant Seeds
4 weeks ago By 尊渡假赌尊渡假赌尊渡假赌

Hot Tools

Notepad++7.3.1

Notepad++7.3.1

Easy-to-use and free code editor

SublimeText3 Chinese version

SublimeText3 Chinese version

Chinese version, very easy to use

Zend Studio 13.0.1

Zend Studio 13.0.1

Powerful PHP integrated development environment

Dreamweaver CS6

Dreamweaver CS6

Visual web development tools

SublimeText3 Mac version

SublimeText3 Mac version

God-level code editing software (SublimeText3)

CakePHP Project Configuration CakePHP Project Configuration Sep 10, 2024 pm 05:25 PM

In this chapter, we will understand the Environment Variables, General Configuration, Database Configuration and Email Configuration in CakePHP.

PHP 8.4 Installation and Upgrade guide for Ubuntu and Debian PHP 8.4 Installation and Upgrade guide for Ubuntu and Debian Dec 24, 2024 pm 04:42 PM

PHP 8.4 brings several new features, security improvements, and performance improvements with healthy amounts of feature deprecations and removals. This guide explains how to install PHP 8.4 or upgrade to PHP 8.4 on Ubuntu, Debian, or their derivati

CakePHP Date and Time CakePHP Date and Time Sep 10, 2024 pm 05:27 PM

To work with date and time in cakephp4, we are going to make use of the available FrozenTime class.

CakePHP File upload CakePHP File upload Sep 10, 2024 pm 05:27 PM

To work on file upload we are going to use the form helper. Here, is an example for file upload.

CakePHP Routing CakePHP Routing Sep 10, 2024 pm 05:25 PM

In this chapter, we are going to learn the following topics related to routing ?

Discuss CakePHP Discuss CakePHP Sep 10, 2024 pm 05:28 PM

CakePHP is an open-source framework for PHP. It is intended to make developing, deploying and maintaining applications much easier. CakePHP is based on a MVC-like architecture that is both powerful and easy to grasp. Models, Views, and Controllers gu

How To Set Up Visual Studio Code (VS Code) for PHP Development How To Set Up Visual Studio Code (VS Code) for PHP Development Dec 20, 2024 am 11:31 AM

Visual Studio Code, also known as VS Code, is a free source code editor — or integrated development environment (IDE) — available for all major operating systems. With a large collection of extensions for many programming languages, VS Code can be c

CakePHP Creating Validators CakePHP Creating Validators Sep 10, 2024 pm 05:26 PM

Validator can be created by adding the following two lines in the controller.

See all articles