Summary of PHP file reading and writing skills

Summary of PHP file reading and writing skills

Introduction:
PHP is a widely used scripting language that is used for Web development. Reading and writing files is a common operation during web development. This article will summarize some common PHP file reading and writing techniques and provide corresponding sample code.

1. File reading skills

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

   $file_content = file_get_contents('example.txt');
   echo $file_content;

2. Use the fgets() function to read the file content line by line:
   Code example:

   $file = fopen('example.txt', 'r');
   while (($line = fgets($file)) !== false) {
    echo $line;
   }
   fclose($file);

3. Use the fread() function to read the file content by the specified number of bytes:
   Code sample:

   $file = fopen('example.txt', 'r');
   $file_content = fread($file, 1024);
   echo $file_content;
   fclose($file);

4. Use the file() function to read the file contents into an array:
   Code sample:

   $file_lines = file('example.txt');
   foreach ($file_lines as $line) {
    echo $line;
   }

2. File writing skills

1. Use the file_put_contents() function to write file contents:
   Code example:

   $data = "Hello, World!";
   file_put_contents('example.txt', $data);

2. Use The fputs() function writes the file content:
   Code example:

   $file = fopen('example.txt', 'w');
   $data = "Hello, World!";
   fputs($file, $data);
   fclose($file);

3. Use the fwrite() function to write the file content:
   Code example:

   $file = fopen('example.txt', 'w');
   $data = "Hello, World!";
   fwrite($file, $data);
   fclose($file);

4. Use append mode ('a') to open the file and write the content:
   Code example:

   $file = fopen('example.txt', 'a');
   $data = "Hello, World!";
   fwrite($file, $data);
   fclose($file);

3. Case - Statistics of file lines
The following is a case of using file reading techniques to count the number of lines in a given file:
Code example:

$file = fopen('example.txt', 'r');
$line_count = 0;
while (($line = fgets($file)) !== false) {
    $line_count++;
}
fclose($file);
echo "总行数：" . $line_count;

Summary:
This article introduces some common PHP file reading and Writing techniques are explained with corresponding code examples. File reading operations can use the file_get_contents(), fgets(), fread() and file() functions; file writing Operations can use the file_put_contents(), fputs() and fwrite() functions. Using these techniques, you can easily perform file reading and writing operations and improve development efficiency.

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