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Example code of php-io-extensions/i2c

Informations about the package i2c

I2C

PHP Zephir Platform

PHP-controllable Linux I²C extension built with Zephir.

The I2C extension allows PHP to communicate with I²C devices on Linux — selecting slave addresses, performing raw reads and writes, and executing combined transactions. Useful for sensors, displays, ADCs, and other hardware connected to an I²C bus.

Requirements

Installation

Install Zephir if you haven't already:

Install the FD extension first — I2C requires raw integer file descriptors that PHP's stream layer cannot provide:

Then clone and build this extension:

The install script handles the full workflow: ensures linux/i2c-dev.h headers are present, loads the i2c-dev kernel module, clean → build → copy .so → write 30-i2c.ini into all detected conf.d directories → verify php -m → reload php-fpm if present.

To use a specific Zephir binary:

API

All methods are static. File descriptors are plain integers. Use the FD extension to open and close them — PHP's stream-based fopen does not produce the raw integer FDs the kernel ioctls require.

I2c\I2CUse

Basic I/O operations on an I²C bus file descriptor.

slave(int $fd, int $address): int

Selects the slave device to communicate with. Must be called before read() or write(). Returns 0 on success, -1 on failure.

read(int $fd, int $bytes_to_read): string

Reads raw bytes from the currently selected slave. Returns the bytes as a binary string, or "" on error.

write(int $fd, string $data, int $bytes_to_write): int

Writes raw bytes to the currently selected slave. Returns the number of bytes written, or -1 on failure.

I2c\I2CConfig

Configuration and advanced transaction operations on an I²C bus file descriptor.

tenbit(int $fd, int $enable): int

Enables (1) or disables (0) 10-bit slave addressing. Returns 0 on success, -1 on failure.

pec(int $fd, int $enable): int

Enables (1) or disables (0) SMBus Packet Error Checking. Returns 0 on success, -1 on failure.

funcs(int $fd): int

Returns the adapter's functionality bitmask, or -1 on failure. Compare against I2C_FUNC_* values from linux/i2c.h.

rdwr(int $fd, array $messages): int

Performs a combined read/write transaction in a single atomic ioctl. Returns the number of messages transferred on success, or -1 on failure.

Each element of $messages is an associative array:

Key Type Description
addr int Slave address
flags int I2C_M_* flags — 0 = write, 0x0001 = read
data string Raw bytes; length determines bytes transferred

Usage

I2C_M flag values for rdwr. PHP does not define these — pass the values directly or define your own constants:

Constant Value Description
I2C_M_WR 0x0000 Write to slave
I2C_M_RD 0x0001 Read from slave
I2C_M_TEN 0x0010 Use 10-bit addressing
I2C_M_NOSTART 0x4000 Skip repeated START condition

Basic read/write

Combined transaction (write then read, no STOP)

Query adapter capabilities

10-bit addressing

License

Copyright © Project Saturn Studios, LLC. All rights reserved.

All versions of i2c with dependencies

PHP Build Version
Package Version
Requires php Version >=8.3
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