PHP offers many functions for file manipulation. The **`copy`** function copies the contents of one file to another.
# Syntax
The syntax for the `copy` function is shown below:
```perl
copy(string $source, string $destination, resource $context = ?): bool
```
# Parameters
The `copy` function takes three parameters:
- `source`: This is a required parameter. `source` is the path of the file to be copied to the other file.  
- `destination`: This is a required parameter. `destination` is the path of the file to which content from the source file will be written.
- `context`: This is an optional parameter. `context` specifies a context resource created with `stream_context_create()`. The *context* is determined by what is being passed along (streamed); this means that the situation is unique for different data types.

>If the file already has content in it, it will be overwritten when it is used as the destination file. 

# Return value
The function returns a bool value; `1` or `true` upon success, and `0` or `false` in case of errors or failure.

# Code
The following code shows how the `copy` function works.

<?php
echo copy("source.txt","destination.txt");
?>

What is the copy function in PHP?

PHP's copy function duplicates file contents to another file, with optional context. Returns true on success.