ショートコードの出力をキャッシュしてみる / Shortcode output be cached, WordPress

<?php
/*
  Plugin Name: Shortcode output be cached
  Plugin URI:
  Description: Shortcode output be cached. [be_cache _name="target shortcode name" _id="cache id" _keyword="success keyword" atts...]
 */

namespace be_cache_shortcode;

function be_cache($atts, $content = null, $tag) {
    global $shortcode_tags;

    if (!array_key_exists('_name', $atts)) {
        return '<p>be_cache: _name is not defined.</p>';
    }
    if (!array_key_exists('_id', $atts)) {
        return '<p>be_cache: _id is not defined.</p>';
    }

    $tag = $atts['_name'];  // shortcode name
    $gid = $atts['_id'];    // cache id

    $keyword = '';
    if (array_key_exists('_keyword', $atts)) {
        $keyword = $atts['_keyword'];
    }

    if (!array_key_exists($tag, $shortcode_tags)) {
        return '<p>be_cache: _name: "'.$tag.'" is not found.</p>';
    }

    $results = '';
    $error = '';
	if (!check_cache($gid)) {
		// echo '<p>get shortcode data</p>';
        $results = $shortcode_tags[$tag]($atts, $content, $tag);

        if ($keyword) {
            if (stripos($results, $keyword) !== FALSE) {
                // echo '<p>success get shortcode data</p>';
                save_cache($gid, $results);
            } else {
                $error = ' <!-- be_cache: output is error: '.$results.' -->';
                $results = '';
            }
        } else if ($results) {
            // echo '<p>success get shortcode data</p>';
            save_cache($gid, $results);
		}
    }
    if (!$results) {
		// echo '<p>load cache data</p>';
		$results = load_cache($gid, $results);
    }

    return $results.$error;
}

function cache_path($gid) {
	$dir = wp_upload_dir(null, false, false);
	// print_r($dir);
	return $dir['basedir'].'/shortcode-be-cache-'.$gid.'.cache';    // uploads/rss-feed-url...\.cache
}

function check_cache($gid) {
	$path = cache_path($gid);

	if (!file_exists($path)) {
		return false;
	}

	if (date("Ymd", filemtime($path)) < date("Ymd", time())) {
		return false;
	}

	return true;
}

function save_cache($gid, $data) {
	return file_put_contents(cache_path($gid), $data);
}

function load_cache($gid) {
	return file_get_contents(cache_path($gid));
}

if (!shortcode_exists('be_cache')) {
    add_shortcode('be_cache', 'be_cache_shortcode\be_cache');
}

<?php

Plugin Name: Shortcode output be cached

Plugin URI:

Description: Shortcode output be cached. [be_cache _name="target shortcode name" _id="cache id" _keyword="success keyword" atts...]

namespace be_cache_shortcode;

function be_cache($atts, $content = null, $tag) {

global $shortcode_tags;

if (!array_key_exists('_name', $atts)) {

return 'be_cache: _name is not defined.';

}

if (!array_key_exists('_id', $atts)) {

return 'be_cache: _id is not defined.';

}

$tag = $atts['_name']; // shortcode name

$gid = $atts['_id']; // cache id

$keyword = '';

if (array_key_exists('_keyword', $atts)) {

$keyword = $atts['_keyword'];

}

if (!array_key_exists($tag, $shortcode_tags)) {

return 'be_cache: _name: "'.$tag.'" is not found.';

}

$results = '';

$error = '';

if (!check_cache($gid)) {

// echo 'get shortcode data';

$results = $shortcode_tags[$tag]($atts, $content, $tag);

if ($keyword) {

if (stripos($results, $keyword) !== FALSE) {

// echo 'success get shortcode data';

save_cache($gid, $results);

} else {

$error = ' ';

$results = '';

}

} else if ($results) {

// echo 'success get shortcode data';

save_cache($gid, $results);

}

if (!$results) {

// echo 'load cache data';

$results = load_cache($gid, $results);

}

return $results.$error;

}

function cache_path($gid) {

$dir = wp_upload_dir(null, false, false);

// print_r($dir);

return $dir['basedir'].'/shortcode-be-cache-'.$gid.'.cache'; // uploads/rss-feed-url...\.cache

}

function check_cache($gid) {

$path = cache_path($gid);

if (!file_exists($path)) {

return false;

}

if (date("Ymd", filemtime($path)) < date("Ymd", time())) {

return false;

}

return true;

}

function save_cache($gid, $data) {

return file_put_contents(cache_path($gid), $data);

}

function load_cache($gid) {

return file_get_contents(cache_path($gid));

}

if (!shortcode_exists('be_cache')) {

add_shortcode('be_cache', 'be_cache_shortcode\be_cache');

}

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