# activitypub/1.0.6/includes/compat.php

ActivityPub, version 1.0.6. 38 lines.

- Page: https://pluginprobe.com/plugins/activitypub/1.0.6/code/includes/compat.php
- Raw: https://pluginprobe.com/plugins/activitypub/1.0.6/raw/includes/compat.php
- Modified: 2023-10-10T15:37:32+00:00

Line numbers below start at 1. Link to a line or a range by appending a fragment to the
page URL, for example `https://pluginprobe.com/plugins/activitypub/1.0.6/code/includes/compat.php#L10-L20`.

```php
<?php
/**
 * ActivityPub implementation for WordPress/PHP functions either missing from older WordPress/PHP versions or not included by default.
 */

if ( ! function_exists( 'str_starts_with' ) ) {
	/**
	 * Polyfill for `str_starts_with()` function added in PHP 8.0.
	 *
	 * Performs a case-sensitive check indicating if
	 * the haystack begins with needle.
	 *
	 * @param string $haystack The string to search in.
	 * @param string $needle   The substring to search for in the `$haystack`.
	 * @return bool True if `$haystack` starts with `$needle`, otherwise false.
	 */
	function str_starts_with( $haystack, $needle ) {
		if ( '' === $needle ) {
			return true;
		}

		return 0 === strpos( $haystack, $needle );
	}
}

if ( ! function_exists( 'get_self_link' ) ) {
	/**
	 * Returns the link for the currently displayed feed.
	 *
	 * @return string Correct link for the atom:self element.
	 */
	function get_self_link() {
		$host = wp_parse_url( home_url() );
		$path = isset( $_SERVER['REQUEST_URI'] ) ? sanitize_text_field( wp_unslash( $_SERVER['REQUEST_URI'] ) ) : '';
		return esc_url( apply_filters( 'self_link', set_url_scheme( 'http://' . $host['host'] . $path ) ) );
	}
}

```