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Current File : /home/uneseuleoc/crid/web/app/plugins/wp-super-cache/plugins/dynamic-cache-test.php
<?php

/*
 * On the Advanced Settings page enable "Enable dynamic caching" and clear
 * the cache.
 *
 * Plugin authors: NEVER define the template tag for your users. Make them
 * choose one so it will be unique to their site.
 *
 * There are two examples in this file. Both use template tags that must be
 * kept secret.
 *
 * GLOSSARY:
 *
 * Dynamic content: the text or widget you want to show visitors to your site
 * that changes every time it's viewed.
 * Placeholder/template tag: the string of random characters placed in your
 * theme file or printed in an action where the dynamic content will go.
 * Output buffer (ob): any text that is printed by PHP to be sent to the browser
 * but captured by PHP for further manipulation.
 * OB Callback function: A function that is called when the output buffer is
 * filled with a html page. The contents of the page are passed to the function
 * for processing.
 *
 * **** MAKE SURE YOU KEEP THE TEMPLATE TAG SECRET ****
 * You should probably add 'deny from all' to the .htaccess in the cache directory
 * so visitors can't directly load any cached html files and discover the secret
 * tag. Or you can move the cache directory out of the web path and set the
 * cache location to that new directory on the advanced settings page.
 *
 */

/*
 * EXAMPLE 1
 * http://ocaoimh.ie/2013/10/21/shiny-new-dynamic-content-wp-super-cache/
 * Replace a string in your theme with the dynamic content.
 *
 * dynamic_cache_test_init()
 * This function is the first one to be called. This function hooks
 * dynamic_cache_test_template() to the WordPress action, wp_footer.
 * This script is loaded before WordPress is and the add_action()
 * function isn't defined at this time.
 * This init function hooks onto the cache action "add_cacheaction"
 * that fires after WordPress (and add_action) is loaded.
 *
 *
 * dynamic_cache_test_template_tag()
 * This function hooks on to wp_footer and displays the secret template
 * tag that will be replaced by our dynamic content on each page view.
 *
 *
 * dynamic_cache_test_filter()
 * This function hooks on to the filter through which all the cached data
 * sent to visitors is sent.
 * In this simple example the template tag is replaced by a html comment
 * containing the text "Hello world at " and the current server time.
 * If you want to use the output of a WordPress plugin or command you
 * must enable "late init" on the settings page. Each time you reload
 * the cached page this time will change. View the page source to examine
 * this text.
 *
 * Chronology of a request:
 * 1. dynamic_cache_test_init() hooks dynamic_cache_test_template_tag() on
 *    to the wp_footer action. dynamic_cache_test_filter() is hooked on to
 *    the wpsc_cachedata filter.
 * 2. An output buffer is created by WP Super Cache.
 * 3. Most of the page is generated by WordPress.
 * 4. The wp_footer action fires and the TAG is printed to the page.
 * 5. Processing continues and the page is created.
 * 6. The output buffer finishes. A WP Super Cache callback function runs
 *    and saves the output buffer to a cache file. The wpsc_cachedata
 *    filter is called.
 * 7. The function dynamic_cache_test_filter() runs and replaces the TAG in
 *    the buffer with the "Hello world" string.
 * 8. The output buffer is pushed to the browser to be displayed.
 */
define( 'DYNAMIC_CACHE_TEST_TAG', '' ); // Change this to a secret placeholder tag.
if ( '' !== DYNAMIC_CACHE_TEST_TAG ) {
	function dynamic_cache_test_safety( $safety ) {
		return 1;
	}
	add_cacheaction( 'wpsc_cachedata_safety', 'dynamic_cache_test_safety' );

	function dynamic_cache_test_filter( $cachedata ) {
		return str_replace( DYNAMIC_CACHE_TEST_TAG, '<!-- Hello world at ' . date( 'H:i:s' ) . ' -->', $cachedata );
	}
	add_cacheaction( 'wpsc_cachedata', 'dynamic_cache_test_filter' );

	function dynamic_cache_test_template_tag() {
		echo DYNAMIC_CACHE_TEST_TAG; // This is the template tag.
	}

	function dynamic_cache_test_init() {
		add_action( 'wp_footer', 'dynamic_cache_test_template_tag' );
	}
	add_cacheaction( 'add_cacheaction', 'dynamic_cache_test_init' );
}

/*
 * EXAMPLE 2
 *
 * This is going to be complicated. Hang on!
 *
 * When the cache file for a new page is generated the plugin uses an output
 * buffer to capture the page. A callback function processes the buffer and
 * writes to the cache file. The placeholder tag for any dynamic content has
 * to be written to that cache file but also, it has to be replaced with
 * dynamic content before the page is shown to the user.
 * More on output buffers here: http://php.net/ob_start
 *
 * Unfortunately an extra output buffer is often required when capturing dynamic
 * content such as sidebar widgets. Due to a quirk of the way PHP works it's
 * not possible to have an output buffer run in an output buffer callback. That
 * dynamic content has to be generated before the callback function is reached.
 * The following error occurs when an output buffer is created in the
 * callback function of another output buffer:
 * "PHP Fatal error:  ob_start(): Cannot use output buffering in output buffering display handlers in..."
 *
 * In this example the function add_action() isn't available when this file is
 * loaded so dynamic_output_buffer_init() is hooked on to the "add_cacheaction"
 * cacheaction. That function then hooks dynamic_output_buffer_test() on to the
 * familiar wp_footer action.
 *
 * The first time dynamic_output_buffer_test() runs it generates the dynamic
 * content and captures it with ob_start() in the DYNAMIC_OB_TEXT constant.
 *
 * When the main WP Super Cache output buffer is ready the callback is called.
 * This fires the wpsc_cachedata_safety filter. If the DYNAMIC_OB_TEXT constant
 * is set, which means dynamic content is ready, then it returns 1, a signal
 * that everything is ok.
 * Finally, the wpsc_cachedata filter is run. The function
 * dynamic_output_buffer_test() is hooked on to it. Since DYNAMIC_OB_TEXT is
 * set it replaces the placeholder text with that constant.
 * The resulting html is then sent to the browser.
 *
 * Already cached pages call the safety filter, and then the wpsc_cachedata
 * filter so any hooked function must be ready to generate dynamic content. The
 * very last line of dynamic_output_buffer_test() replaces the placeholder tag
 * with the dynamic content in the cache file.
 *
 * Use an output buffer to capture dynamic content while the page is generated
 * and insert into the right place:
 * Remember to add the DYNAMIC_OUTPUT_BUFFER_TAG text (as defined below) to
 * your theme where the dynamic content should be.
 *
 * dynamic_output_buffer_test() is a function that uses the wpsc_cachedata
 * filter to add a small message and the current server time to every web
 * page. The time increments on every reload.
 *
 */

define( 'DYNAMIC_OUTPUT_BUFFER_TAG', '' ); // Change this to a secret placeholder tag.

if ( '' !== DYNAMIC_OUTPUT_BUFFER_TAG ) {
	function dynamic_output_buffer_test( $cachedata = 0 ) {
		if ( defined( 'DYNAMIC_OB_TEXT' ) ) {
			return str_replace( DYNAMIC_OUTPUT_BUFFER_TAG, DYNAMIC_OB_TEXT, $cachedata );
		}

		ob_start();
		// call the sidebar function, do something dynamic
		echo '<p>This is a test. The current time on the server is: ' . date( 'H:i:s' ) . '</p>';
		$text = ob_get_contents();
		ob_end_clean();

		if ( 0 === $cachedata ) { // called directly from the theme so store the output.
			define( 'DYNAMIC_OB_TEXT', $text );
		} else { // called via the wpsc_cachedata filter. We only get here in cached pages in wp-cache-phase1.php.
			return str_replace( DYNAMIC_OUTPUT_BUFFER_TAG, $text, $cachedata );
		}

	}
	add_cacheaction( 'wpsc_cachedata', 'dynamic_output_buffer_test' );

	function dynamic_output_buffer_init() {
		add_action( 'wp_footer', 'dynamic_output_buffer_test' );
	}
	add_cacheaction( 'add_cacheaction', 'dynamic_output_buffer_init' );

	function dynamic_output_buffer_test_safety( $safety ) {
		if ( defined( 'DYNAMIC_OB_TEXT' ) ) {// this is set when you call dynamic_output_buffer_test() from the theme.
			return 1; // ready to replace tag with dynamic content.
		} else {
			return 0; // tag cannot be replaced.
		}
	}
	add_cacheaction( 'wpsc_cachedata_safety', 'dynamic_output_buffer_test_safety' );
}

Youez - 2016 - github.com/yon3zu
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