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Vendor lemmon
Package validator
Short Description A lightweight, fluent validation library for PHP.
License MIT
Homepage https://github.com/lemmon/validator-php

Keywords schema validator validation zod valibot

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Informations about the package validator

Lemmon Validator

Lemmon Validator is a PHP library with no third-party Composer dependencies for validating and transforming scalar values, indexed arrays, and nested schemas for associative arrays or stdClass objects through a fluent API. It combines form-safe coercion, ordered pipelines, and structured errors for exception and non-exception workflows.

[!NOTE] Lemmon Validator is pre-1.0 and under active development. Minor releases may contain breaking changes; review the changelog before upgrading.

Installation

Requirements: PHP 8.3 or higher with the mbstring extension

Quick Start

Validators accept null by default. Use required() when a value must be present.

Features

No third-party Composer dependencies — the runtime depends only on PHP and mbstring
Strict runtime type validation for strings, integers, floats, booleans, indexed arrays, associative arrays, and stdClass objects; conversions are opt-in through coerce()
Form-safe optional fields — validators accept null unless required(); numeric, boolean, and container coercion turns an empty string into null, while strings can opt in with nullifyEmpty()
Predictable processing — pipeline steps execute in chain order, then default() and required() resolve the final value
Composable schemas — validate nested data, omit undeclared fields by default, or retain them explicitly with passthrough()
Structured errors — stable codes, dotted display paths, exact path segments, messages, and parameters support programmatic handling, i18n, path filtering, and JSON serialization
Extensible rules — use PHP callables with transform(), pipe(), and satisfies(), or compose validators with logical combinators

Philosophy

Lemmon Validator focuses on core validation and predictable schema behavior rather than reimplementing every specialized rule. Its transformation and custom-validation methods accept ordinary PHP callables, so application-specific behavior can be composed without framework integrations or custom validator subclasses.

Documentation

Getting Started

Installation & Setup
Basic Usage
Core Concepts

Validation Guides

String Validation — Email, URL, patterns, length constraints
Numeric Validation — Integers, floats, ranges, constraints
Array Validation — Indexed arrays and item validation
Object & Schema Validation — Complex nested structures
Custom Validation — User-defined functions and business logic
Error Handling — Working with validation errors

Factory Reference

Validator Factory

Examples

Form Validation

For AI Agents

llms.txt — Technical specification with API signatures, parameters, and core behavior

Security

Please report suspected vulnerabilities privately by following the Security Policy. Do not disclose security issues in the public issue tracker.

Contributing

Contributions are welcome. Read the Contributing Guide, or open an issue to report a bug or propose an improvement.

License

Lemmon Validator is licensed under the MIT License.

All versions of validator with dependencies

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Package Version

Version v0.17.0 Release 25. Jul 2026
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Requires php Version ^8.3
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