(PHP 5 >= 5.3.0, PHP 7, PECL phar >= 2.0.0)
Phar::isWritable — Returns true if the phar archive can be modified
public Phar::isWritable ( ) : bool
This method returns true if phar.readonly is 0, and the actual phar archive on disk is not read-only.
No parameters.
Returns true if the phar archive can be modified
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https://www.php.net/manual/en/phar.iswritable.php