CaptureCache

The CaptureCache pattern is useful for generating static resources to return via HTTP request. When used in such a fashion, the web server needs to be configured to run a PHP script generating the requested resource so that subsequent requests for the same resource can be shipped without calling PHP again.

This pattern comes with basic logic for managing generated resources.

Quick Start

For use with an Apache 404 handler:

# .htdocs
ErrorDocument 404 /index.php

// index.php
use Zend\Cache\PatternFactory;
$capture = Zend\Cache\PatternFactory::factory('capture', [
    'public_dir' => __DIR__,
]);

// Start capturing all output, excluding headers, and write to the public
// directory:
$capture->start();

// Don't forget to change the HTTP response code
header('Status: 200', true, 200);

// do stuff to dynamically generate output

Configuration Options

Option	Data Type	Default Value	Description
`public_dir`	`string`	none	Location of the public web root directory in which to write output.
`index_filename`	`string`	"index.html"	The name of the index file if only a directory was requested.
`file_locking`	`bool`	`true`	Whether or not to lock output files when writing.
`file_permission`	`int	bool`	`0600` (`false` on Windows)
`dir_permission`	`int	bool`	`0700` (`false` on Windows)
`umask`	`int`	`bool`	`false`

Available Methods

In addition to the methods exposed in PatternInterface, this implementation exposes the following methods.

namespace Zend\Cache\Pattern;

use Zend\Cache\Exception;
use Zend\Stdlib\ErrorHandler;

class CaptureCache extends AbstractPattern
{
    /**
     * Start the cache.
     *
     * [@param](https://github.com/param)  string $pageId  Page identifier
     * [@return](https://github.com/return) void
     */
    public function start($pageId = null);

    /**
     * Write a page to the requested path.
     *
     * [@param](https://github.com/param) string      $content
     * [@param](https://github.com/param) null|string $pageId
     * [@throws](https://github.com/throws) Exception\LogicException
     */
    public function set($content, $pageId = null);

    /**
     * Retrieve a generated page from the cache.
     *
     * [@param](https://github.com/param)  null|string $pageId
     * [@return](https://github.com/return) string|null
     * [@throws](https://github.com/throws) Exception\LogicException
     * [@throws](https://github.com/throws) Exception\RuntimeException
     */
    public function get($pageId = null);

    /**
     * Check if a cache exists for the given page.
     *
     * [@param](https://github.com/param)  null|string $pageId
     * [@throws](https://github.com/throws) Exception\LogicException
     * [@return](https://github.com/return) bool
     */
    public function has($pageId = null);

    /**
     * Remove a page from the cache.
     *
     * [@param](https://github.com/param)  null|string $pageId
     * [@throws](https://github.com/throws) Exception\LogicException
     * [@throws](https://github.com/throws) Exception\RuntimeException
     * [@return](https://github.com/return) bool
     */
    public function remove($pageId = null);

    /**
     * Clear cached pages that match the specified glob pattern.
     *
     * [@param](https://github.com/param) string $pattern
     * [@throws](https://github.com/throws) Exception\LogicException
     */
    public function clearByGlob($pattern = '**');

    /**
     * Returns the generated file name.
     *
     * [@param](https://github.com/param) null|string $pageId
     * [@return](https://github.com/return) string
     */
    public function getFilename($pageId = null);
}

Examples

Scaling Images in the Web Root

Using the following Apache 404 configuration:

# .htdocs
ErrorDocument 404 /index.php

Use the following script:

// index.php
$captureCache = Zend\Cache\PatternFactory::factory('capture', [
    'public_dir' => __DIR__,
]);

// TODO

Zend Cache Laravel Package