File operation technology in PHP

As a widely used scripting language, PHP has many powerful functions and technologies for processing files. In this article, we will delve into the file operation technology in PHP, including common operations such as reading, writing, copying, moving, and deleting files.

1. File reading

In PHP, you can use the function file() to read the entire file and return an array. Each element of the array is a line of the file. For example:

$file = file("test.txt");
foreach($file as $line) {
    echo $line."<br>";
}

In addition, you can also use functions such as fopen(), fread(), fgets(), etc. to read the file content line by line. For example:

$handle = fopen("test.txt", "r");
while(!feof($handle)) {
    $line = fgets($handle);
    echo $line."<br>";
}
fclose($handle);

2. File writing

Similar to file reading, PHP also provides a variety of file writing methods. Use the fopen() function to open the file and specify the writing mode ("w" means overwriting the original file content, "a" means appending the content to the end of the file), and then use the fwrite() function to write the content to the file. For example:

$handle = fopen("test.txt", "w");
fwrite($handle, "Hello World!");
fclose($handle);

3. File copy

In PHP, use the copy() function to copy a file to the target path. For example:

if(copy("test.txt", "backup/test.txt")) {
    echo "文件复制成功！";
} else {
    echo "文件复制失败！";
}

4. File movement

PHP provides the rename() function to move and rename files. For example:

if(rename("test.txt", "path/to/new/test.txt")) {
    echo "文件移动成功！";
} else {
    echo "文件移动失败！";
}

5. File deletion

Use the unlink() function to delete a file. For example:

if(unlink("test.txt")) {
    echo "文件删除成功！";
} else {
    echo "文件删除失败！";
}

In summary, the above file operation technologies are very convenient to use in PHP and can be applied to different scene requirements. Of course, you also need to be careful when handling files to avoid problems such as errors or file loss.

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