Copy a file internal to the phar archive to another new file within the phar

# Phar::copy

(PHP 5 >= 5.3.0, PHP 7, PHP 8, PECL phar >= 2.0.0)

Phar::copy — Copy a file internal to the phar archive to another new file within the phar

### 说明

public function Phar::copy(string `$from`, string `$to`): true

> 注意: 此方法需要 将 php.ini 中的 `phar.readonly` 设为 `0` 以适合 Phar 对象. 否则, 将抛出PharException.

Copy a file internal to the phar archive to another new file within the phar. This is an object-oriented alternative to using copy() with the phar stream wrapper.

### 参数

`from`

`to`

### 返回值

总是返回 `true`。

### 错误／异常

Throws UnexpectedValueException if the source file does not exist, the destination file already exists, write access is disabled, opening either file fails, reading the source file fails, or a PharException if writing the changes to the phar fails.

### 示例

示例 #1 A Phar::copy() example

This example shows using Phar::copy() and the equivalent stream wrapper performance of the same thing. The primary difference between the two approaches is error handling. All Phar methods throw exceptions, whereas the stream wrapper uses trigger_error().

    <?php

    try {
        $phar = new Phar('myphar.phar');

        $phar['a'] = 'hi';
        $phar->copy('a', 'b');

        echo $phar['b']; // Outputs "phar://myphar.phar/b"
    } catch (Exception $e) {
        // Handle error
    }

    // The stream wrapper equivalent of the above code.
    // E_WARNING are triggered on error rather than exceptions
    copy('phar://myphar.phar/a', 'phar//myphar.phar/c');
    echo file_get_contents('phar://myphar.phar/c'); // Outputs "hi"

    ?>

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