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wp-content/plugins/jetpack/modules/shortcodes/archives.php

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+<?php
+/**
+ * Archives shortcode
+ *
+ * @author bubel & nickmomrik
+ * [archives limit=10]
+ *
+ * @package automattic/jetpack
+ */
+
+if ( ! defined( 'ABSPATH' ) ) {
+	exit( 0 );
+}
+
+add_shortcode( 'archives', 'archives_shortcode' );
+
+/**
+ * Display Archives shortcode.
+ *
+ * @param array $atts Shortcode attributes.
+ */
+function archives_shortcode( $atts ) {
+	if ( is_feed() ) {
+		return '[archives]';
+	}
+
+	global $allowedposttags;
+
+	$default_atts = array(
+		'type'      => 'postbypost',
+		'limit'     => '',
+		'format'    => 'html',
+		'showcount' => false,
+		'before'    => '',
+		'after'     => '',
+		'order'     => 'desc',
+	);
+
+	$attr = shortcode_atts( $default_atts, $atts, 'archives' );
+
+	if ( ! in_array( $attr['type'], array( 'yearly', 'monthly', 'daily', 'weekly', 'postbypost' ), true ) ) {
+		$attr['type'] = 'postbypost';
+	}
+
+	if ( ! in_array( $attr['format'], array( 'html', 'option', 'custom' ), true ) ) {
+		$attr['format'] = 'html';
+	}
+
+	$limit = (int) $attr['limit'];
+	// A Limit of 0 makes no sense so revert back to the default.
+	if ( empty( $limit ) ) {
+		$limit = '';
+	}
+
+	/*
+	 * The `postbypost` type (also the default) lists one entry per published
+	 * post. Left unbounded, wp_get_archives() materializes the entire post table
+	 * in a single request, which can exhaust PHP memory and fatal on large sites.
+	 * Apply a sane, filterable default cap when no explicit limit was supplied.
+	 */
+	if ( 'postbypost' === $attr['type'] && '' === $limit ) {
+		/**
+		 * Filter the default number of entries listed by the [archives] shortcode
+		 * when using the unbounded `postbypost` type with no explicit `limit`.
+		 *
+		 * Set to 0 to restore the previous (unlimited) behavior, though this is
+		 * not recommended on sites with a large number of posts.
+		 *
+		 * @module shortcodes
+		 *
+		 * @since 16.0
+		 *
+		 * @param int $limit Default maximum number of posts to list. Default 100.
+		 */
+		$default_limit = (int) apply_filters( 'jetpack_archives_shortcode_default_limit', 100 );
+
+		if ( $default_limit > 0 ) {
+			$limit = $default_limit;
+		}
+	}
+
+	$showcount = false !== $attr['showcount'] && 'false' !== $attr['showcount'];
+	$before    = wp_kses( $attr['before'], $allowedposttags );
+	$after     = wp_kses( $attr['after'], $allowedposttags );
+
+	// Get the archives.
+	$archives = wp_get_archives(
+		array(
+			'type'            => $attr['type'],
+			'limit'           => $limit,
+			'format'          => $attr['format'],
+			'echo'            => false,
+			'show_post_count' => $showcount,
+			'before'          => $before,
+			'after'           => $after,
+		)
+	);
+
+	if ( 'asc' === $attr['order'] ) {
+		$archives = implode( "\n", array_reverse( explode( "\n", $archives ) ) );
+	}
+
+	// Check to see if there are any archives.
+	if ( empty( $archives ) ) {
+		$archives = '<p>' . __( 'Your blog does not currently have any published posts.', 'jetpack' ) . '</p>';
+	} elseif ( 'option' === $attr['format'] ) {
+		$is_amp           = class_exists( 'Jetpack_AMP_Support' ) && Jetpack_AMP_Support::is_amp_request();
+		$change_attribute = $is_amp ? 'on="change:AMP.navigateTo(url=event.value)"' : 'onchange="document.location.href=this.options[this.selectedIndex].value;"';
+		$archives         = '<select name="archive-dropdown" ' . $change_attribute . '><option value="' . get_permalink() . '">--</option>' . $archives . '</select>';
+	} elseif ( 'html' === $attr['format'] ) {
+		$archives = '<ul>' . $archives . '</ul>';
+	}
+
+	return $archives;
+}