Документация PHP
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What makes a phar a phar and not a tar or a zip?
Head-to-head comparison of Phar, Tar and Zip
What makes a phar a phar and not a tar or a zip?
Phar file stub
A Phar's stub is a simple PHP file. The smallest possible stub follows:
<?php __HALT_COMPILER();
A stub must contain as a minimum, the __HALT_COMPILER(); token at its conclusion. Typically, a stub will contain loader functionality like so:
<?php
Phar::mapPhar();
include 'phar://myphar.phar/index.php';
__HALT_COMPILER();
There are no restrictions on the contents of a Phar stub, except for the requirement that it conclude with __HALT_COMPILER();. The closing PHP tag
?>may be included or omitted, but there can be no more than 1 space between the ; and the close tag
?>or the phar extension will be unable to process the Phar archive's manifest.
In a tar or zip-based phar archive, the stub is stored in the .phar/stub.php file. The default stub for phar-based Phar archives contains approximately 7k of code to extract the contents of the phar and execute them. See Phar::createDefaultStub() for more detail.
The phar alias is stored in a tar or zip-based phar archive in the .phar/alias.txt file as plain text.
What makes a phar a phar and not a tar or a zip?
Head-to-head comparison of Phar, Tar and Zip