Make private properties checkable for backwards compatibility.
(string) (Required) Property to check if set.
(bool) Whether the property is set.
File: wp-admin/includes/class-wp-filesystem-base.php
/** * Returns the path on the remote filesystem of WP_PLUGIN_DIR.
| Version | Description |
|---|---|
| 4.0.0 | Introduced. |
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https://developer.wordpress.org/reference/classes/wp_filesystem_base/__isset