Introduction to PHP functions—copy(): copy files

PHP function introduction—copy(): copy files

In PHP, we often need to handle file copy operations. The copy() function is a very useful function. It is used to copy the source file to the target file and realize the file copy operation.

The usage of the copy() function is very simple. It accepts two parameters: source file path and target file path. The following is an example of the copy() function:

<?php
$source_file = "example.txt";
$target_file = "copy_example.txt";

if (copy($source_file, $target_file)) {
    echo "文件复制成功！";
} else {
    echo "文件复制失败！";
}
?>

In the above example, we copy the source file "example.txt" to the target file "copy_example.txt". If the copy is successful, "File copy successful!" will be output, otherwise "File copy failed!" will be output.

It is worth noting that the copy() function is only suitable for copying files. If you need to copy a folder, you need to use other methods.

There is another thing to note about the copy() function, which is the path of the target file. If a file with the same name already exists in the destination path, the copy operation will overwrite the original file. If a file with the same name does not exist in the destination path, the copy operation creates a new file.

In addition, the copy() function can also be used to copy remote files. For example, you can copy a remote file to a local target file by specifying the source file path as a URL.

The following is an example of copying a remote file:

<?php
$source_file = "http://example.com/remotefile.txt";
$target_file = "localfile.txt";

if (copy($source_file, $target_file)) {
    echo "远程文件复制成功！";
} else {
    echo "远程文件复制失败！";
}
?>

In this example, we copy the remote file "http://example.com/remotefile.txt" to the target file "localfile .txt" in.

The return value of the copy() function is of Boolean type. If the copy is successful, it returns true, otherwise it returns false. Therefore, we can perform corresponding processing based on the results of the copy operation.

To summarize, the copy() function is a commonly used function in PHP for copying files. Through it, we can easily copy the source file to the target file and realize the file copy operation. Whether it is a local file or a remote file, the copy() function can complete the copy task. When using the copy() function, you need to pay attention to whether the file with the same name already exists in the target path and the result of the copy operation.

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