(PHP 5 >= 5.3.0, PHP 7, PECL phar >= 1.0.0)
Phar::canWrite — Returns whether phar extension supports writing and creating phars
final public static Phar::canWrite ( ) : bool
This static method determines whether write access has been disabled in the system php.ini via the phar.readonly ini variable.
true if write access is enabled, false if it is disabled.
Example #1 A Phar::canWrite() example
<?php
if (Phar::canWrite()) {
file_put_contents('phar://myphar.phar/file.txt', 'hi there');
}
?>
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https://www.php.net/manual/en/phar.canwrite.php