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Title: Validation — CodeIgniter 4.7.4 documentation

Links:

	https://codeigniter4.github.io/userguide/index.html
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Helper Functions	https://codeigniter4.github.io/userguide/general/helpers.html
Global Functions and Constants	https://codeigniter4.github.io/userguide/general/common_functions.html
Logging Information	https://codeigniter4.github.io/userguide/general/logging.html
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Web Page Caching	https://codeigniter4.github.io/userguide/general/caching.html
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Managing your Applications	https://codeigniter4.github.io/userguide/general/managing_apps.html
Handling Multiple Environments	https://codeigniter4.github.io/userguide/general/environments.html
Controllers and Routing	https://codeigniter4.github.io/userguide/incoming/index.html
URI Routing	https://codeigniter4.github.io/userguide/incoming/routing.html
Controllers	https://codeigniter4.github.io/userguide/incoming/controllers.html
Controller Filters	https://codeigniter4.github.io/userguide/incoming/filters.html
Controller Attributes	https://codeigniter4.github.io/userguide/incoming/controller_attributes.html
Auto Routing (Improved)	https://codeigniter4.github.io/userguide/incoming/auto_routing_improved.html
HTTP Messages	https://codeigniter4.github.io/userguide/incoming/message.html
Request Class	https://codeigniter4.github.io/userguide/incoming/request.html
IncomingRequest Class	https://codeigniter4.github.io/userguide/incoming/incomingrequest.html
Content Negotiation	https://codeigniter4.github.io/userguide/incoming/content_negotiation.html
HTTP Method Spoofing	https://codeigniter4.github.io/userguide/incoming/methodspoofing.html
RESTful Resource Handling	https://codeigniter4.github.io/userguide/incoming/restful.html
Building Responses	https://codeigniter4.github.io/userguide/outgoing/index.html
Views	https://codeigniter4.github.io/userguide/outgoing/views.html
View Renderer	https://codeigniter4.github.io/userguide/outgoing/view_renderer.html
View Layouts	https://codeigniter4.github.io/userguide/outgoing/view_layouts.html
View Cells	https://codeigniter4.github.io/userguide/outgoing/view_cells.html
View Parser	https://codeigniter4.github.io/userguide/outgoing/view_parser.html
View Decorators	https://codeigniter4.github.io/userguide/outgoing/view_decorators.html
HTML Table Class	https://codeigniter4.github.io/userguide/outgoing/table.html
HTTP Responses	https://codeigniter4.github.io/userguide/outgoing/response.html
API Responses	https://codeigniter4.github.io/userguide/outgoing/api_responses.html
API Resources	https://codeigniter4.github.io/userguide/outgoing/api_transformers.html
Content Security Policy	https://codeigniter4.github.io/userguide/outgoing/csp.html
Localization	https://codeigniter4.github.io/userguide/outgoing/localization.html
Alternate PHP Syntax for View Files	https://codeigniter4.github.io/userguide/outgoing/alternative_php.html
Working with Databases	https://codeigniter4.github.io/userguide/database/index.html
Quick Start: Usage Examples	https://codeigniter4.github.io/userguide/database/examples.html
Database Configuration	https://codeigniter4.github.io/userguide/database/configuration.html
Connecting to a Database	https://codeigniter4.github.io/userguide/database/connecting.html
Running Queries	https://codeigniter4.github.io/userguide/database/queries.html
Generating Query Results	https://codeigniter4.github.io/userguide/database/results.html
Query Helper Methods	https://codeigniter4.github.io/userguide/database/helpers.html
Query Builder Class	https://codeigniter4.github.io/userguide/database/query_builder.html
Transactions	https://codeigniter4.github.io/userguide/database/transactions.html
Getting Metadata	https://codeigniter4.github.io/userguide/database/metadata.html
Custom Function Calls	https://codeigniter4.github.io/userguide/database/call_function.html
Database Events	https://codeigniter4.github.io/userguide/database/events.html
Database Utilities	https://codeigniter4.github.io/userguide/database/utilities.html
Modeling Data	https://codeigniter4.github.io/userguide/models/index.html
Using CodeIgniter's Model	https://codeigniter4.github.io/userguide/models/model.html
Using Entity Classes	https://codeigniter4.github.io/userguide/models/entities.html
Managing Databases	https://codeigniter4.github.io/userguide/dbmgmt/index.html
Database Forge	https://codeigniter4.github.io/userguide/dbmgmt/forge.html
Database Migrations	https://codeigniter4.github.io/userguide/dbmgmt/migration.html
Database Seeding	https://codeigniter4.github.io/userguide/dbmgmt/seeds.html
Database Commands	https://codeigniter4.github.io/userguide/dbmgmt/db_commands.html
Library Reference	https://codeigniter4.github.io/userguide/libraries/index.html
Caching Driver	https://codeigniter4.github.io/userguide/libraries/caching.html
Cookies	https://codeigniter4.github.io/userguide/libraries/cookies.html
Cross-Origin Resource Sharing (CORS)	https://codeigniter4.github.io/userguide/libraries/cors.html
CURLRequest Class	https://codeigniter4.github.io/userguide/libraries/curlrequest.html
Email Class	https://codeigniter4.github.io/userguide/libraries/email.html
Encryption Service	https://codeigniter4.github.io/userguide/libraries/encryption.html
Working with Files	https://codeigniter4.github.io/userguide/libraries/files.html
File Collections	https://codeigniter4.github.io/userguide/libraries/file_collections.html
Honeypot Class	https://codeigniter4.github.io/userguide/libraries/honeypot.html
Image Manipulation Class	https://codeigniter4.github.io/userguide/libraries/images.html
Pagination	https://codeigniter4.github.io/userguide/libraries/pagination.html
Publisher	https://codeigniter4.github.io/userguide/libraries/publisher.html
Security	https://codeigniter4.github.io/userguide/libraries/security.html
Session Library	https://codeigniter4.github.io/userguide/libraries/sessions.html
Throttler	https://codeigniter4.github.io/userguide/libraries/throttler.html
Times and Dates	https://codeigniter4.github.io/userguide/libraries/time.html
Typography	https://codeigniter4.github.io/userguide/libraries/typography.html
Working with Uploaded Files	https://codeigniter4.github.io/userguide/libraries/uploaded_files.html
Working with URIs	https://codeigniter4.github.io/userguide/libraries/uri.html
User Agent Class	https://codeigniter4.github.io/userguide/libraries/user_agent.html
Validation	https://codeigniter4.github.io/userguide/libraries/validation.html
Helpers	https://codeigniter4.github.io/userguide/helpers/index.html
Array Helper	https://codeigniter4.github.io/userguide/helpers/array_helper.html
Cookie Helper	https://codeigniter4.github.io/userguide/helpers/cookie_helper.html
Date Helper	https://codeigniter4.github.io/userguide/helpers/date_helper.html
Filesystem Helper	https://codeigniter4.github.io/userguide/helpers/filesystem_helper.html
Form Helper	https://codeigniter4.github.io/userguide/helpers/form_helper.html
HTML Helper	https://codeigniter4.github.io/userguide/helpers/html_helper.html
Inflector Helper	https://codeigniter4.github.io/userguide/helpers/inflector_helper.html
Number Helper	https://codeigniter4.github.io/userguide/helpers/number_helper.html
Security Helper	https://codeigniter4.github.io/userguide/helpers/security_helper.html
Test Helper	https://codeigniter4.github.io/userguide/helpers/test_helper.html
Text Helper	https://codeigniter4.github.io/userguide/helpers/text_helper.html
URL Helper	https://codeigniter4.github.io/userguide/helpers/url_helper.html
XML Helper	https://codeigniter4.github.io/userguide/helpers/xml_helper.html
Testing	https://codeigniter4.github.io/userguide/testing/index.html
Getting Started	https://codeigniter4.github.io/userguide/testing/overview.html
Database	https://codeigniter4.github.io/userguide/testing/database.html
Generating Data	https://codeigniter4.github.io/userguide/testing/fabricator.html
Controller Testing	https://codeigniter4.github.io/userguide/testing/controllers.html
HTTP Testing	https://codeigniter4.github.io/userguide/testing/feature.html
Testing Responses	https://codeigniter4.github.io/userguide/testing/response.html
Testing CLI Commands	https://codeigniter4.github.io/userguide/testing/cli.html
Mocking	https://codeigniter4.github.io/userguide/testing/mocking.html
Benchmarking	https://codeigniter4.github.io/userguide/testing/benchmark.html
Debugging Your Application	https://codeigniter4.github.io/userguide/testing/debugging.html
Session Testing	https://codeigniter4.github.io/userguide/testing/session_testing.html
Command Line Usage	https://codeigniter4.github.io/userguide/cli/index.html
CLI Overview	https://codeigniter4.github.io/userguide/cli/cli_overview.html
Running Controllers via CLI	https://codeigniter4.github.io/userguide/cli/cli_controllers.html
Spark Commands	https://codeigniter4.github.io/userguide/cli/spark_commands.html
Creating Spark Commands	https://codeigniter4.github.io/userguide/cli/cli_commands.html
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CLI Library	https://codeigniter4.github.io/userguide/cli/cli_library.html
CLI Signals	https://codeigniter4.github.io/userguide/cli/cli_signals.html
CLIRequest Class	https://codeigniter4.github.io/userguide/cli/cli_request.html
Extending CodeIgniter	https://codeigniter4.github.io/userguide/extending/index.html
Creating Core System Classes	https://codeigniter4.github.io/userguide/extending/core_classes.html
Replacing Common Functions	https://codeigniter4.github.io/userguide/extending/common.html
Events	https://codeigniter4.github.io/userguide/extending/events.html
Extending the Controller	https://codeigniter4.github.io/userguide/extending/basecontroller.html
Authentication	https://codeigniter4.github.io/userguide/extending/authentication.html
Creating Composer Packages	https://codeigniter4.github.io/userguide/extending/composer_packages.html
Contributing to CodeIgniter	https://codeigniter4.github.io/userguide/extending/contributing.html
Official Packages	https://codeigniter4.github.io/userguide/libraries/official_packages.html
CodeIgniter	https://codeigniter4.github.io/userguide/index.html
	https://codeigniter4.github.io/userguide/index.html
Library Reference	https://codeigniter4.github.io/userguide/libraries/index.html
	https://codeigniter4.github.io/userguide/libraries/validation.html#validation
Overview	https://codeigniter4.github.io/userguide/libraries/validation.html#overview
Form Validation Tutorial	https://codeigniter4.github.io/userguide/libraries/validation.html#form-validation-tutorial
The Form	https://codeigniter4.github.io/userguide/libraries/validation.html#the-form
The Success Page	https://codeigniter4.github.io/userguide/libraries/validation.html#the-success-page
The Controller	https://codeigniter4.github.io/userguide/libraries/validation.html#the-controller
The Routes	https://codeigniter4.github.io/userguide/libraries/validation.html#the-routes
Try it!	https://codeigniter4.github.io/userguide/libraries/validation.html#try-it
Explanation	https://codeigniter4.github.io/userguide/libraries/validation.html#explanation
Add Validation Rules	https://codeigniter4.github.io/userguide/libraries/validation.html#add-validation-rules
Config for Validation	https://codeigniter4.github.io/userguide/libraries/validation.html#config-for-validation
Traditional and Strict Rules	https://codeigniter4.github.io/userguide/libraries/validation.html#traditional-and-strict-rules
Loading the Library	https://codeigniter4.github.io/userguide/libraries/validation.html#loading-the-library
How Validation Works	https://codeigniter4.github.io/userguide/libraries/validation.html#how-validation-works
Setting Validation Rules	https://codeigniter4.github.io/userguide/libraries/validation.html#setting-validation-rules
Setting a Single Rule	https://codeigniter4.github.io/userguide/libraries/validation.html#setting-a-single-rule
Setting Multiple Rules	https://codeigniter4.github.io/userguide/libraries/validation.html#setting-multiple-rules
Setting Rules for Array Data	https://codeigniter4.github.io/userguide/libraries/validation.html#setting-rules-for-array-data
withRequest()	https://codeigniter4.github.io/userguide/libraries/validation.html#withrequest
Working with Validation	https://codeigniter4.github.io/userguide/libraries/validation.html#working-with-validation
Running Validation	https://codeigniter4.github.io/userguide/libraries/validation.html#running-validation
Running Multiple Validations	https://codeigniter4.github.io/userguide/libraries/validation.html#running-multiple-validations
Validating 1 Value	https://codeigniter4.github.io/userguide/libraries/validation.html#validating-1-value
Getting Validated Data	https://codeigniter4.github.io/userguide/libraries/validation.html#getting-validated-data
Saving Sets of Validation Rules to the Config File	https://codeigniter4.github.io/userguide/libraries/validation.html#saving-sets-of-validation-rules-to-the-config-file
Validation Placeholders	https://codeigniter4.github.io/userguide/libraries/validation.html#validation-placeholders
Working with Errors	https://codeigniter4.github.io/userguide/libraries/validation.html#working-with-errors
Setting Custom Error Messages	https://codeigniter4.github.io/userguide/libraries/validation.html#setting-custom-error-messages
Translation of Messages and Validation Labels	https://codeigniter4.github.io/userguide/libraries/validation.html#translation-of-messages-and-validation-labels
Getting All Errors	https://codeigniter4.github.io/userguide/libraries/validation.html#getting-all-errors
Getting a Single Error	https://codeigniter4.github.io/userguide/libraries/validation.html#getting-a-single-error
Check If Error Exists	https://codeigniter4.github.io/userguide/libraries/validation.html#check-if-error-exists
Redirect and Validation Errors	https://codeigniter4.github.io/userguide/libraries/validation.html#redirect-and-validation-errors
Customizing Error Display	https://codeigniter4.github.io/userguide/libraries/validation.html#customizing-error-display
Creating the Views	https://codeigniter4.github.io/userguide/libraries/validation.html#creating-the-views
Configuration	https://codeigniter4.github.io/userguide/libraries/validation.html#configuration
Specifying the Template	https://codeigniter4.github.io/userguide/libraries/validation.html#specifying-the-template
Creating Custom Rules	https://codeigniter4.github.io/userguide/libraries/validation.html#creating-custom-rules
Using Rule Classes	https://codeigniter4.github.io/userguide/libraries/validation.html#using-rule-classes
Using Closure Rule	https://codeigniter4.github.io/userguide/libraries/validation.html#using-closure-rule
Using Callable Rule	https://codeigniter4.github.io/userguide/libraries/validation.html#using-callable-rule
Available Rules	https://codeigniter4.github.io/userguide/libraries/validation.html#available-rules
Rules for General Use	https://codeigniter4.github.io/userguide/libraries/validation.html#rules-for-general-use
Rules for File Uploads	https://codeigniter4.github.io/userguide/libraries/validation.html#rules-for-file-uploads
Overview	https://codeigniter4.github.io/userguide/libraries/validation.html#id5
	https://codeigniter4.github.io/userguide/libraries/validation.html#overview
Form Validation Tutorial	https://codeigniter4.github.io/userguide/libraries/validation.html#id6
	https://codeigniter4.github.io/userguide/libraries/validation.html#form-validation-tutorial
View	https://codeigniter4.github.io/userguide/outgoing/views.html
controller	https://codeigniter4.github.io/userguide/incoming/controllers.html
The Form	https://codeigniter4.github.io/userguide/libraries/validation.html#id7
	https://codeigniter4.github.io/userguide/libraries/validation.html#the-form
The Success Page	https://codeigniter4.github.io/userguide/libraries/validation.html#id8
	https://codeigniter4.github.io/userguide/libraries/validation.html#the-success-page
The Controller	https://codeigniter4.github.io/userguide/libraries/validation.html#id9
	https://codeigniter4.github.io/userguide/libraries/validation.html#the-controller
$this->request->is()	https://codeigniter4.github.io/userguide/incoming/incomingrequest.html#incomingrequest-is
$this->validator->getValidated()	https://codeigniter4.github.io/userguide/libraries/validation.html#validation-getting-validated-data
The Routes	https://codeigniter4.github.io/userguide/libraries/validation.html#id10
	https://codeigniter4.github.io/userguide/libraries/validation.html#the-routes
Try it!	https://codeigniter4.github.io/userguide/libraries/validation.html#id11
	https://codeigniter4.github.io/userguide/libraries/validation.html#try-it
$this->validateData()	https://codeigniter4.github.io/userguide/incoming/controllers.html#controller-validatedata
$this->validateData()	https://codeigniter4.github.io/userguide/incoming/controllers.html#controller-validatedata
Explanation	https://codeigniter4.github.io/userguide/libraries/validation.html#id12
	https://codeigniter4.github.io/userguide/libraries/validation.html#explanation
	https://codeigniter4.github.io/userguide/libraries/validation.html#signup-php
form helper	https://codeigniter4.github.io/userguide/helpers/form_helper.html
	https://codeigniter4.github.io/userguide/libraries/validation.html#form-php
$this->validateData()	https://codeigniter4.github.io/userguide/incoming/controllers.html#controller-validatedata
Add Validation Rules	https://codeigniter4.github.io/userguide/libraries/validation.html#id13
	https://codeigniter4.github.io/userguide/libraries/validation.html#add-validation-rules
Config for Validation	https://codeigniter4.github.io/userguide/libraries/validation.html#id14
	https://codeigniter4.github.io/userguide/libraries/validation.html#config-for-validation
Traditional and Strict Rules	https://codeigniter4.github.io/userguide/libraries/validation.html#id15
	https://codeigniter4.github.io/userguide/libraries/validation.html#traditional-and-strict-rules
	https://codeigniter4.github.io/userguide/libraries/validation.html#strict-rules
	https://codeigniter4.github.io/userguide/libraries/validation.html#traditional-rules
	https://codeigniter4.github.io/userguide/libraries/validation.html#using-traditional-rules
Loading the Library	https://codeigniter4.github.io/userguide/libraries/validation.html#id16
	https://codeigniter4.github.io/userguide/libraries/validation.html#loading-the-library
Controller	https://codeigniter4.github.io/userguide/incoming/controllers.html
Model	https://codeigniter4.github.io/userguide/models/model.html
How Validation Works	https://codeigniter4.github.io/userguide/libraries/validation.html#id17
	https://codeigniter4.github.io/userguide/libraries/validation.html#how-validation-works
Setting Validation Rules	https://codeigniter4.github.io/userguide/libraries/validation.html#id18
	https://codeigniter4.github.io/userguide/libraries/validation.html#setting-validation-rules
Setting a Single Rule	https://codeigniter4.github.io/userguide/libraries/validation.html#id19
	https://codeigniter4.github.io/userguide/libraries/validation.html#setting-a-single-rule
	https://codeigniter4.github.io/userguide/libraries/validation.html#setrule
Setting Multiple Rules	https://codeigniter4.github.io/userguide/libraries/validation.html#id20
	https://codeigniter4.github.io/userguide/libraries/validation.html#setting-multiple-rules
	https://codeigniter4.github.io/userguide/libraries/validation.html#setrules
Setting Rules for Array Data	https://codeigniter4.github.io/userguide/libraries/validation.html#id21
	https://codeigniter4.github.io/userguide/libraries/validation.html#setting-rules-for-array-data
Upgrading	https://codeigniter4.github.io/userguide/installation/upgrade_444.html#upgrade-444-validation-with-dot-array-syntax
withRequest()	https://codeigniter4.github.io/userguide/libraries/validation.html#id22
	https://codeigniter4.github.io/userguide/libraries/validation.html#withrequest
$request->getVar()	https://codeigniter4.github.io/userguide/incoming/incomingrequest.html#incomingrequest-getting-data
request-order	https://www.php.net/manual/en/ini.core.php#ini.request-order
getValidated()	https://codeigniter4.github.io/userguide/libraries/validation.html#validation-getting-validated-data
$request->getJSON()	https://codeigniter4.github.io/userguide/incoming/incomingrequest.html#incomingrequest-getting-json-data
$request->getRawInput()	https://codeigniter4.github.io/userguide/incoming/incomingrequest.html#incomingrequest-retrieving-raw-data
$request->getVar()	https://codeigniter4.github.io/userguide/incoming/incomingrequest.html#incomingrequest-getting-data
getValidated()	https://codeigniter4.github.io/userguide/libraries/validation.html#validation-getting-validated-data
Working with Validation	https://codeigniter4.github.io/userguide/libraries/validation.html#id23
	https://codeigniter4.github.io/userguide/libraries/validation.html#working-with-validation
Running Validation	https://codeigniter4.github.io/userguide/libraries/validation.html#id24
	https://codeigniter4.github.io/userguide/libraries/validation.html#running-validation
predefined group of rules	https://codeigniter4.github.io/userguide/libraries/validation.html#validation-array
Running Multiple Validations	https://codeigniter4.github.io/userguide/libraries/validation.html#id25
	https://codeigniter4.github.io/userguide/libraries/validation.html#running-multiple-validations
Validating 1 Value	https://codeigniter4.github.io/userguide/libraries/validation.html#id26
	https://codeigniter4.github.io/userguide/libraries/validation.html#validating-1-value
Getting Validated Data	https://codeigniter4.github.io/userguide/libraries/validation.html#id27
	https://codeigniter4.github.io/userguide/libraries/validation.html#getting-validated-data
Saving Sets of Validation Rules to the Config File	https://codeigniter4.github.io/userguide/libraries/validation.html#id28
	https://codeigniter4.github.io/userguide/libraries/validation.html#saving-sets-of-validation-rules-to-the-config-file
	https://codeigniter4.github.io/userguide/libraries/validation.html#how-to-save-your-rules
	https://codeigniter4.github.io/userguide/libraries/validation.html#how-to-specify-rule-group
	https://codeigniter4.github.io/userguide/libraries/validation.html#how-to-save-error-messages
Setting Custom Error Messages	https://codeigniter4.github.io/userguide/libraries/validation.html#validation-custom-errors
	https://codeigniter4.github.io/userguide/libraries/validation.html#getting-setting-rule-groups
	https://codeigniter4.github.io/userguide/libraries/validation.html#get-rule-group
	https://codeigniter4.github.io/userguide/libraries/validation.html#set-rule-group
Validation Placeholders	https://codeigniter4.github.io/userguide/libraries/validation.html#id29
	https://codeigniter4.github.io/userguide/libraries/validation.html#validation-placeholders
Working with Errors	https://codeigniter4.github.io/userguide/libraries/validation.html#id30
	https://codeigniter4.github.io/userguide/libraries/validation.html#working-with-errors
Setting Custom Error Messages	https://codeigniter4.github.io/userguide/libraries/validation.html#id31
	https://codeigniter4.github.io/userguide/libraries/validation.html#setting-custom-error-messages
Translation of Messages and Validation Labels	https://codeigniter4.github.io/userguide/libraries/validation.html#id32
	https://codeigniter4.github.io/userguide/libraries/validation.html#translation-of-messages-and-validation-labels
Getting All Errors	https://codeigniter4.github.io/userguide/libraries/validation.html#id33
	https://codeigniter4.github.io/userguide/libraries/validation.html#getting-all-errors
Getting a Single Error	https://codeigniter4.github.io/userguide/libraries/validation.html#id34
	https://codeigniter4.github.io/userguide/libraries/validation.html#getting-a-single-error
Check If Error Exists	https://codeigniter4.github.io/userguide/libraries/validation.html#id35
	https://codeigniter4.github.io/userguide/libraries/validation.html#check-if-error-exists
Redirect and Validation Errors	https://codeigniter4.github.io/userguide/libraries/validation.html#id36
	https://codeigniter4.github.io/userguide/libraries/validation.html#redirect-and-validation-errors
validation_errors()	https://codeigniter4.github.io/userguide/helpers/form_helper.html#validation_errors
validation_list_errors()	https://codeigniter4.github.io/userguide/helpers/form_helper.html#validation_list_errors
validation_show_error()	https://codeigniter4.github.io/userguide/helpers/form_helper.html#validation_show_error
redirect()	https://codeigniter4.github.io/userguide/general/common_functions.html#redirect
Customizing Error Display	https://codeigniter4.github.io/userguide/libraries/validation.html#id37
	https://codeigniter4.github.io/userguide/libraries/validation.html#customizing-error-display
Creating the Views	https://codeigniter4.github.io/userguide/libraries/validation.html#id38
	https://codeigniter4.github.io/userguide/libraries/validation.html#creating-the-views
Configuration	https://codeigniter4.github.io/userguide/libraries/validation.html#id39
	https://codeigniter4.github.io/userguide/libraries/validation.html#configuration
Specifying the Template	https://codeigniter4.github.io/userguide/libraries/validation.html#id40
	https://codeigniter4.github.io/userguide/libraries/validation.html#specifying-the-template
Creating Custom Rules	https://codeigniter4.github.io/userguide/libraries/validation.html#id41
	https://codeigniter4.github.io/userguide/libraries/validation.html#creating-custom-rules
Using Rule Classes	https://codeigniter4.github.io/userguide/libraries/validation.html#id42
	https://codeigniter4.github.io/userguide/libraries/validation.html#using-rule-classes
	https://codeigniter4.github.io/userguide/libraries/validation.html#adding-a-ruleset
	https://codeigniter4.github.io/userguide/libraries/validation.html#creating-a-rule-class
	https://codeigniter4.github.io/userguide/libraries/validation.html#using-a-custom-rule
	https://codeigniter4.github.io/userguide/libraries/validation.html#allowing-parameters
Using Closure Rule	https://codeigniter4.github.io/userguide/libraries/validation.html#id43
	https://codeigniter4.github.io/userguide/libraries/validation.html#using-closure-rule
Using Callable Rule	https://codeigniter4.github.io/userguide/libraries/validation.html#id44
	https://codeigniter4.github.io/userguide/libraries/validation.html#using-callable-rule
Available Rules	https://codeigniter4.github.io/userguide/libraries/validation.html#id45
	https://codeigniter4.github.io/userguide/libraries/validation.html#available-rules
Rules for General Use	https://codeigniter4.github.io/userguide/libraries/validation.html#id46
	https://codeigniter4.github.io/userguide/libraries/validation.html#rules-for-general-use
empty()	https://www.php.net/manual/en/function.empty.php
empty()	https://www.php.net/manual/en/function.empty.php
timezone_identifiers_list()	https://www.php.net/manual/en/function.timezone-identifiers-list.php
strtotime()	https://www.php.net/manual/en/function.strtotime.php
Rules for File Uploads	https://codeigniter4.github.io/userguide/libraries/validation.html#id47
	https://codeigniter4.github.io/userguide/libraries/validation.html#rules-for-file-uploads
File Upload Form Tutorial	https://codeigniter4.github.io/userguide/libraries/uploaded_files.html#file-upload-form-tutorial
Previous	https://codeigniter4.github.io/userguide/libraries/user_agent.html
Next	https://codeigniter4.github.io/userguide/helpers/index.html
Sphinx	https://www.sphinx-doc.org/
theme	https://github.com/readthedocs/sphinx_rtd_theme
Read the Docs	https://readthedocs.org

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