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wp-content/plugins/wordpress-seo/src/conditionals/admin/post-conditional.php

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+<?php
+
+namespace Yoast\WP\SEO\Conditionals\Admin;
+
+use Yoast\WP\SEO\Conditionals\Conditional;
+
+/**
+ * Conditional that is only met when on a post edit or new post page.
+ */
+class Post_Conditional implements Conditional {
+
+	/**
+	 * Returns whether or not this conditional is met.
+	 *
+	 * @return bool Whether or not the conditional is met.
+	 */
+	public function is_met() {
+		global $pagenow;
+
+		// Current page is the creation of a new post (type, i.e. post, page, custom post or attachment).
+		if ( $pagenow === 'post-new.php' ) {
+			return true;
+		}
+
+		// Current page is the edit page of an existing post (type, i.e. post, page, custom post or attachment).
+		if ( $pagenow === 'post.php' ) {
+			return true;
+		}
+
+		return false;
+	}
+}