PHP file reading and writing tutorial: Master the basic reading and writing methods

PHP file reading and writing tutorial: Master the basic reading and writing methods

Introduction
PHP is a scripting language widely used in web development. Its reading and writing operations on files are very flexible and powerful. This tutorial will introduce you to commonly used file reading and writing methods in PHP, and provide some practical code examples to help readers quickly master these techniques.

1. File reading

1. Use the file_get_contents() function to read the entire file content

$file_path = "example.txt" ;
$file_content = file_get_contents($file_path);
echo $file_content;
?>

2. Read the file content line by line

$file_path = "example.txt";
$file_handle = fopen($file_path, "r");

while (!feof($file_handle)) {

$line = fgets($file_handle);
echo $line;

}

fclose($file_handle);
?>

3. Read the CSV file and process the data

$file_path = "example.csv";
$file_handle = fopen($file_path, "r");

$data = array();

while (($line = fgetcsv( $file_handle)) !== false) {

$data[] = $line;

}

fclose($file_handle);

print_r($data);
?>

2. File writing

1. Use the file_put_contents() function to overwrite the written content

$file_path = "example.txt";
$file_content = "Hello, world!";
file_put_contents($file_path, $file_content);
?>

2. Use the fwrite() function to append content to the file

$file_path = "example.txt";
$file_handle = fopen($file_path, "a");
$file_content = "This is a new line.";

fwrite($file_handle, $file_content);
fclose($file_handle);
?>

3. Write the array to the CSV file

$file_path = "example.csv";
$file_handle = fopen($file_path, "w");

$data = array(

array("Name", "Age", "Email"),
array("John Doe", "30", "johndoe@example.com"),
array("Jane Smith", "25", "janesmith@example.com")

);

foreach ($data as $line) {

fputcsv($file_handle, $line);

}

fclose($file_handle);
?>

Summary
Through this tutorial, we learned about the commonly used file reading and writing methods in PHP and explained them with detailed code examples. Mastering these basic reading and writing operation skills is very useful for web development and data processing. It is hoped that readers can further understand the various usages of PHP file operations through learning and practice, and apply them flexibly in actual projects.

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