File copy function for PHP applications

PHP is a widely used server-side programming language with a wide range of applications. One of the common tasks is file copying. File copying refers to the process of copying a file from the source path to the destination path.

In PHP, there are a variety of file copy functions to choose from. This article will briefly introduce three of them: copy(), rename() and file_put_contents().

1. copy() function

The copy() function is one of the most commonly used file copy functions in PHP. Its syntax is as follows:

bool copy ( string $source , string $dest [, resource $context ] )

Among them, $source is the source path, $dest is the destination path, and $context is an optional parameter, indicating the context resource parameter.

The copy() function returns a Boolean value, indicating whether the operation was successful. Returns true if successful, false if failed.

The following is an example of using the copy() function to copy a file:

$source_file = '/var/www/html/source.txt';
$dest_file = '/var/www/html/dest.txt';

if (copy($source_file, $dest_file)) {
    echo "文件拷贝成功！";
} else {
    echo "文件拷贝失败！";
}

In the above example, the copy() function copies the source file source.txt to the target file dest.txt, If the copy is successful, "File copy successful!" is output on the screen, otherwise "File copy failed!" is output.

2. rename() function

The rename() function can also be used for file copying. Its syntax is as follows:

bool rename ( string $oldname , string $newname [, resource $context ] )

Among them, $oldname is the source path, $newname is the target path, and $context is an optional parameter, indicating the context resource parameter.

The return value of the rename() function is also a Boolean value, indicating whether the operation was successful.

The following is an example of using the rename() function to copy a file:

$source_file = '/var/www/html/source.txt';
$dest_file = '/var/www/html/dest.txt';

if (rename($source_file, $dest_file)) {
    echo "文件拷贝成功！";
} else {
    echo "文件拷贝失败！";
}

In the above example, the rename() function renames the source file source.txt to dest.txt. If If the operation is successful, "File copy successful!" will be output on the screen, otherwise "File copy failed!" will be output.

It should be noted that when using the rename() function to copy a file, the source file will be deleted.

3. file_put_contents() function

The file_put_contents() function is another commonly used file copy function, which is available in PHP5.1 and later versions. Its syntax is as follows:

int file_put_contents ( string $filename , mixed $data [, int $flags = 0 [, resource $context ]] )

Among them, $filename is the target path, $data is the data to be written to the file, $flags is an optional parameter, specifies the file writing mode, and $context is an optional parameter. Represents context resource parameters.

The return value of the file_put_contents() function is the number of bytes written to the file. If the writing fails, false is returned.

The following is an example of using the file_put_contents() function to copy a file:

$source_file = '/var/www/html/source.txt';
$dest_file = '/var/www/html/dest.txt';

if (file_put_contents($dest_file, file_get_contents($source_file))) {
    echo "文件拷贝成功！";
} else {
    echo "文件拷贝失败！";
}

In the above example, the file_put_contents() function reads the contents of the source file source.txt and writes into the target file dest.txt. If the operation is successful, "File copy successful!" will be output on the screen, otherwise "File copy failed!" will be output.

It should be noted that if the target file already exists, the file_put_contents() function will overwrite the original file content.

The above introduces three commonly used file copy functions in PHP, each of which has its own characteristics. The copy() function is the most commonly used file copy function, the rename() function can rename files, and the file_put_contents() function is a powerful file writing function provided by PHP5.1 and later versions. In actual development, you can choose which function to use based on actual needs.

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