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CakePHP

C CakePHP 4.6 Strawberry API

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Class CheckHttpCacheComponent

Use HTTP caching headers to see if rendering can be skipped.

Checks if the response can be considered different according to the request headers, and caching headers in the response. If the response was not modified, then the controller and view render process is skipped. And the client will get a response with an empty body and a "304 Not Modified" header.

To use this component your controller actions must set either the Last-Modified or Etag header. Without one of these headers being set this component will have no effect.

Namespace: Cake\Controller\Component

Property Summary

  • $_componentMap protected
    array<string, array>

    A component lookup table used to lazy load component objects.

  • $_config protected
    array<string, mixed>

    Runtime config

  • $_configInitialized protected
    bool

    Whether the config property has already been configured with defaults

  • $_defaultConfig protected
    array<string, mixed>

    Default config

  • $_registry protected
    Cake\Controller\ComponentRegistry

    Component registry class used to lazy load components.

  • $components protected
    array

    Other Components this component uses.

Method Summary

  • __construct() public

    Constructor

  • __debugInfo() public

    Returns an array that can be used to describe the internal state of this object.

  • __get() public

    Magic method for lazy loading $components.

  • _configDelete() protected

    Deletes a single config key.

  • _configRead() protected

    Reads a config key.

  • _configWrite() protected

    Writes a config key.

  • beforeRender() public

    Before Render hook

  • configShallow() public

    Merge provided config with existing config. Unlike config() which does a recursive merge for nested keys, this method does a simple merge.

  • getConfig() public

    Returns the config.

  • getConfigOrFail() public

    Returns the config for this specific key.

  • getController() public

    Get the controller this component is bound to.

  • implementedEvents() public

    Get the Controller callbacks this Component is interested in.

  • initialize() public

    Constructor hook method.

  • log() public

    Convenience method to write a message to Log. See Log::write() for more information on writing to logs.

  • setConfig() public

    Sets the config.

Method Detail

__construct() ¶ public

__construct(Cake\Controller\ComponentRegistry $registry, array<string, mixed> $config = [])

Constructor

Parameters
Cake\Controller\ComponentRegistry $registry

A component registry this component can use to lazy load its components.

array<string, mixed> $config optional

Array of configuration settings.

__debugInfo() ¶ public

__debugInfo(): array<string, mixed>

Returns an array that can be used to describe the internal state of this object.

Returns
array<string, mixed>

__get() ¶ public

__get(string $name): Cake\Controller\Component|null

Magic method for lazy loading $components.

Parameters
string $name

Name of component to get.

Returns
Cake\Controller\Component|null

_configDelete() ¶ protected

_configDelete(string $key): void

Deletes a single config key.

Parameters
string $key

Key to delete.

Returns
void
Throws
Cake\Core\Exception\CakeException
if attempting to clobber existing config

_configRead() ¶ protected

_configRead(string|null $key): mixed

Reads a config key.

Parameters
string|null $key

Key to read.

Returns
mixed

_configWrite() ¶ protected

_configWrite(array<string, mixed>|string $key, mixed $value, string|bool $merge = false): void

Writes a config key.

Parameters
array<string, mixed>|string $key

Key to write to.

mixed $value

Value to write.

string|bool $merge optional

True to merge recursively, 'shallow' for simple merge, false to overwrite, defaults to false.

Returns
void
Throws
Cake\Core\Exception\CakeException
if attempting to clobber existing config

beforeRender() ¶ public

beforeRender(Cake\Event\EventInterface $event): void

Before Render hook

Parameters
Cake\Event\EventInterface $event

The Controller.beforeRender event.

Returns
void

configShallow() ¶ public

configShallow(array<string, mixed>|string $key, mixed|null $value = null): $this

Merge provided config with existing config. Unlike config() which does a recursive merge for nested keys, this method does a simple merge.

Setting a specific value:

$this->configShallow('key', $value);

Setting a nested value:

$this->configShallow('some.nested.key', $value);

Updating multiple config settings at the same time:

$this->configShallow(['one' => 'value', 'another' => 'value']);
Parameters
array<string, mixed>|string $key

The key to set, or a complete array of configs.

mixed|null $value optional

The value to set.

Returns
$this

getConfig() ¶ public

getConfig(string|null $key = null, mixed $default = null): mixed

Returns the config.

Usage

Reading the whole config:

$this->getConfig();

Reading a specific value:

$this->getConfig('key');

Reading a nested value:

$this->getConfig('some.nested.key');

Reading with default value:

$this->getConfig('some-key', 'default-value');
Parameters
string|null $key optional

The key to get or null for the whole config.

mixed $default optional

The return value when the key does not exist.

Returns
mixed

getConfigOrFail() ¶ public

getConfigOrFail(string $key): mixed

Returns the config for this specific key.

The config value for this key must exist, it can never be null.

Parameters
string $key

The key to get.

Returns
mixed
Throws
InvalidArgumentException

getController() ¶ public

getController(): Cake\Controller\Controller

Get the controller this component is bound to.

Returns
Cake\Controller\Controller

implementedEvents() ¶ public

implementedEvents(): array<string, mixed>

Get the Controller callbacks this Component is interested in.

Uses Conventions to map controller events to standard component callback method names. By defining one of the callback methods a component is assumed to be interested in the related event.

Override this method if you need to add non-conventional event listeners. Or if you want components to listen to non-standard events.

Returns
array<string, mixed>

initialize() ¶ public

initialize(array<string, mixed> $config): void

Constructor hook method.

Implement this method to avoid having to overwrite the constructor and call parent.

Parameters
array<string, mixed> $config

The configuration settings provided to this component.

Returns
void

log() ¶ public

log(string $message, string|int $level = LogLevel::ERROR, array|string $context = []): bool

Convenience method to write a message to Log. See Log::write() for more information on writing to logs.

Parameters
string $message

Log message.

string|int $level optional

Error level.

array|string $context optional

Additional log data relevant to this message.

Returns
bool

setConfig() ¶ public

setConfig(array<string, mixed>|string $key, mixed|null $value = null, bool $merge = true): $this

Sets the config.

Usage

Setting a specific value:

$this->setConfig('key', $value);

Setting a nested value:

$this->setConfig('some.nested.key', $value);

Updating multiple config settings at the same time:

$this->setConfig(['one' => 'value', 'another' => 'value']);
Parameters
array<string, mixed>|string $key

The key to set, or a complete array of configs.

mixed|null $value optional

The value to set.

bool $merge optional

Whether to recursively merge or overwrite existing config, defaults to true.

Returns
$this
Throws
Cake\Core\Exception\CakeException
When trying to set a key that is invalid.

Property Detail

$_componentMap ¶ protected

A component lookup table used to lazy load component objects.

Type
array<string, array>

$_config ¶ protected

Runtime config

Type
array<string, mixed>

$_configInitialized ¶ protected

Whether the config property has already been configured with defaults

Type
bool

$_defaultConfig ¶ protected

Default config

These are merged with user-provided config when the component is used.

Type
array<string, mixed>

$_registry ¶ protected

Component registry class used to lazy load components.

Type
Cake\Controller\ComponentRegistry

$components ¶ protected

Other Components this component uses.

Type
array
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