How to use php-lock/lock with Redis for distributed locking?

Use RedisMutex with a Redis connection object; for distributed setups, employ DistributedMutex with multiple Redis instances following the RedLock algorithm. Ensure ext-redis or Predis is installed.

php-lock/lock vs Symfony Lock component - which is better?

php-lock/lock offers a backend-agnostic, unified API with more storage options, while Symfony's component is tightly integrated with the framework. Choose based on need for flexibility versus Symfony ecosystem compatibility.

How to handle lock timeouts with php-lock?

Timeouts are supported in implementations like FlockMutex and MySQLMutex via constructor parameters. Configure the timeout value to prevent indefinite waiting, but note that some backends may have default behaviors.

Does php-lock/lock support PHP 8.3 or newer versions?

The library currently supports PHP 7.4 to 8.5, so PHP 8.3 is included. Check the GitHub repository for updates, as support for newer PHP versions might be added in future releases.

How to implement double-checked locking with php-lock in a web app?

Use the Mutex::check() method to set a condition callable, then chain with then() to execute code only if the condition holds before and after lock acquisition, optimizing for scenarios like cache validation.

Can php-lock/lock be used for file locking in PHP CLI scripts?

Yes, use FlockMutex with a file handle; however, without the pcntl extension, it uses busy waiting, which can be inefficient. Install pcntl to enable non-busy waiting for better performance.

Lock — PHP Library for Serialized Execution

What is Lock?

php-lock/lock is a PHP library that ensures serialized execution of critical code sections in concurrent environments to prevent race conditions and data corruption. It provides a unified Mutex interface with multiple backend implementations, making it essential for applications requiring safe concurrent access to shared resources.

Target Audience

PHP developers building applications that handle concurrent processes, such as web servers, background job systems, or distributed systems where shared resources like databases or files need synchronized access.

Value Proposition

Developers choose php-lock/lock for its flexible, backend-agnostic Mutex API that supports various storage systems (e.g., Redis, MySQL, flock), along with features like double-checked locking and robust error handling, ensuring reliability across different deployment environments.

Popular PHP library for serialized execution of critical code in concurrent situations

Use Cases

Best For

Implementing distributed locks in PHP applications using Redis or Memcached backends.
Preventing race conditions in critical code sections like financial transactions or inventory updates.
Ensuring serialized execution of code across multiple processes or servers in concurrent environments.
Using double-checked locking patterns to optimize performance by avoiding unnecessary lock acquisition.
Handling lock release failures gracefully while preserving the results or exceptions from synchronized code.
Building applications that require advisory locking with PostgreSQL or MySQL for database-level concurrency control.

Not Ideal For

Projects using NoSQL databases not supported by the library, such as MongoDB or Cassandra, for locking mechanisms.
Teams already using PHP frameworks with integrated locking solutions like Laravel's cache locks, who prefer built-in, framework-specific tools.
Applications requiring fine-grained, row-level database locking, as this library provides coarser mutexes based on keys or files rather than direct row control.
Environments with strict minimal dependency policies, as it often requires external PHP extensions or services like Redis or Memcached.

Pros & Cons

Pros

Unified Locking Interface

Provides a consistent Mutex API across multiple backends like Redis, MySQL, and flock, simplifying code maintenance and reducing vendor lock-in.

Backend Flexibility

Supports various storage systems including Redis, Memcached, databases, and file locks, allowing adaptation to different infrastructure needs without code changes.

Double-Checked Locking

Implements a check-then-lock pattern via the check() method, optimizing performance by avoiding unnecessary lock acquisition when conditions aren't met.

Robust Error Handling

LockReleaseException captures results or exceptions from synchronized code even if lock release fails, ensuring data integrity and graceful failure management.

Cons

Extension Dependencies

Requires specific PHP extensions (e.g., ext-redis, ext-memcached) or external services for most backends, increasing setup complexity and potential compatibility issues.

MySQL Version Limitations

For MySQLMutex, versions below 5.7.5 have issues with nested locks, as noted in the README, which can lead to silent lock releases and data corruption risks.

Performance Inefficiencies

Implementations like FlockMutex use busy waiting without the pcntl extension, wasting CPU cycles in high-concurrency CLI environments, as mentioned in the requirements.

Frequently Asked Questions

What is Lock?

Target Audience

Value Proposition

Use Cases

Best For

Implementing distributed locks in PHP applications using Redis or Memcached backends.
Preventing race conditions in critical code sections like financial transactions or inventory updates.
Ensuring serialized execution of code across multiple processes or servers in concurrent environments.
Using double-checked locking patterns to optimize performance by avoiding unnecessary lock acquisition.
Handling lock release failures gracefully while preserving the results or exceptions from synchronized code.
Building applications that require advisory locking with PostgreSQL or MySQL for database-level concurrency control.

Not Ideal For

Projects using NoSQL databases not supported by the library, such as MongoDB or Cassandra, for locking mechanisms.
Teams already using PHP frameworks with integrated locking solutions like Laravel's cache locks, who prefer built-in, framework-specific tools.
Applications requiring fine-grained, row-level database locking, as this library provides coarser mutexes based on keys or files rather than direct row control.
Environments with strict minimal dependency policies, as it often requires external PHP extensions or services like Redis or Memcached.

Pros & Cons

Pros

Unified Locking Interface

Provides a consistent Mutex API across multiple backends like Redis, MySQL, and flock, simplifying code maintenance and reducing vendor lock-in.

Backend Flexibility

Supports various storage systems including Redis, Memcached, databases, and file locks, allowing adaptation to different infrastructure needs without code changes.

Double-Checked Locking

Implements a check-then-lock pattern via the check() method, optimizing performance by avoiding unnecessary lock acquisition when conditions aren't met.

Robust Error Handling

LockReleaseException captures results or exceptions from synchronized code even if lock release fails, ensuring data integrity and graceful failure management.

Cons

Extension Dependencies

Requires specific PHP extensions (e.g., ext-redis, ext-memcached) or external services for most backends, increasing setup complexity and potential compatibility issues.

MySQL Version Limitations

For MySQLMutex, versions below 5.7.5 have issues with nested locks, as noted in the README, which can lead to silent lock releases and data corruption risks.

Performance Inefficiencies

Implementations like FlockMutex use busy waiting without the pcntl extension, wasting CPU cycles in high-concurrency CLI environments, as mentioned in the requirements.

Frequently Asked Questions

Lock

What is Lock?

Overview

Use Cases

Best For

Not Ideal For

Pros & Cons

Pros

Cons

Frequently Asked Questions

Related Projects

Found a gem we're missing?

Lock

What is Lock?

Overview

Use Cases

Best For

Not Ideal For

Pros & Cons

Pros

Cons

Frequently Asked Questions

Related Projects

Found a gem we're missing?