Supported Functions

TrueAsync adapts 70+ standard PHP functions for non-blocking operation within coroutines. All listed functions automatically become asynchronous when called inside a coroutine. Outside of a coroutine, they work as usual.

DNS

Function	Description
`gethostbyname()`	Resolve hostname to IP address
`gethostbyaddr()`	Reverse resolve IP address to hostname
`gethostbynamel()`	Get list of IP addresses for hostname

Databases

PDO MySQL

Function	Description
`PDO::__construct()`	Non-blocking connection
`PDO::prepare()`	Prepare statement
`PDO::exec()`	Execute query
`PDOStatement::execute()`	Execute prepared statement
`PDOStatement::fetch()`	Fetch results

PDO PgSQL

Function	Description
`PDO::__construct()`	Non-blocking connection
`PDO::prepare()`	Prepare statement
`PDO::exec()`	Execute query
`PDOStatement::execute()`	Execute prepared statement
`PDOStatement::fetch()`	Fetch results

PDO Connection Pooling

Transparent connection pooling for PDO via Async\Pool integration. Each coroutine receives its own connection from the pool with automatic lifecycle management.

MySQLi

Function	Description
`mysqli_connect()`	Non-blocking connection
`mysqli_query()`	Execute query
`mysqli_prepare()`	Prepare statement
`mysqli_stmt_execute()`	Execute prepared statement
`mysqli_fetch_*()`	Fetch results

PostgreSQL (native)

Function	Description
`pg_connect()`	Non-blocking connection
`pg_query()`	Execute query
`pg_prepare()`	Prepare statement
`pg_execute()`	Execute prepared statement
`pg_fetch_*()`	Fetch results

Each async context uses a separate connection for safe concurrency.

CURL

Function	Description
`curl_exec()`	Execute request
`curl_multi_exec()`	Execute multiple requests
`curl_multi_select()`	Wait for activity
`curl_multi_getcontent()`	Get content
`curl_setopt()`	Set options
`curl_getinfo()`	Get request info
`curl_error()`	Get error
`curl_close()`	Close handle

Sockets

Function	Description
`socket_create()`	Create socket
`socket_create_pair()`	Create socket pair
`socket_connect()`	Connect
`socket_accept()`	Accept connection
`socket_read()`	Read data
`socket_write()`	Write data
`socket_send()`	Send data
`socket_recv()`	Receive data
`socket_sendto()`	Send to address
`socket_recvfrom()`	Receive from address
`socket_bind()`	Bind to address
`socket_listen()`	Listen
`socket_select()`	Monitor socket activity

File and Stream I/O

Function	Description
`fopen()`	Open file
`fclose()`	Close file
`fread()`	Read from file
`fwrite()`	Write to file
`fgets()`	Read line
`fgetc()`	Read character
`fgetcsv()`	Read CSV line
`fputcsv()`	Write CSV line
`fseek()`	Set position
`ftell()`	Get position
`rewind()`	Reset position
`ftruncate()`	Truncate file
`fflush()`	Flush buffers
`fscanf()`	Formatted read
`file_get_contents()`	Read entire file
`file_put_contents()`	Write entire file
`file()`	Read file into array
`copy()`	Copy file
`tmpfile()`	Create temporary file
`readfile()`	Output file
`fpassthru()`	Output remaining file
`stream_get_contents()`	Read remaining stream
`stream_copy_to_stream()`	Copy between streams

Stream Sockets

Function	Description
`stream_socket_client()`	Create client connection
`stream_socket_server()`	Create server socket
`stream_socket_accept()`	Accept connection
`stream_select()`	Monitor stream activity
`stream_context_create()`	Create async-aware context

Limitation: stream_select() with pipe streams (e.g. from proc_open()) is not supported on Windows. On Linux/macOS it works natively through the event loop.

Process Execution

Function	Description
`proc_open()`	Open process with pipes
`proc_close()`	Close process
`exec()`	Execute external command
`shell_exec()`	Execute shell command
`system()`	Execute system command
`passthru()`	Execute with direct output

Timers and Delays

Function	Description
`sleep()`	Delay in seconds
`usleep()`	Delay in microseconds
`time_nanosleep()`	Nanosecond precision delay
`time_sleep_until()`	Wait until timestamp

Output Buffering

Each coroutine receives an isolated output buffer.

Function	Description
`ob_start()`	Start buffering
`ob_flush()`	Flush buffer
`ob_clean()`	Clean buffer
`ob_get_contents()`	Get buffer contents
`ob_end_clean()`	End buffering

Not Yet Supported

Functions planned for implementation or not yet adapted.

DNS

Function	Description
`dns_check_record()` / `checkdnsrr()`	Check DNS record
`dns_get_mx()` / `getmxrr()`	Get MX records
`dns_get_record()`	Get DNS resource records

Databases

Extension	Description
PDO ODBC	ODBC driver
PDO Oracle	Oracle driver
PDO SQLite	SQLite driver
PDO Firebird	Firebird driver
MongoDB	MongoDB client

File Operations (metadata)

Function	Description
`flock()`	File locking
`opendir()` / `readdir()` / `closedir()`	Directory traversal
`unlink()` / `rename()`	File deletion and renaming
`mkdir()` / `rmdir()`	Directory creation and removal
`stat()` / `lstat()`	File information
`readlink()`	Read symbolic links

Note: File metadata operations on local disk complete in microseconds. Making them async only makes sense for network file systems (NFS).

What’s Next?

spawn() — creating coroutines
await() — waiting for results
Coroutines — concepts and examples

Documentation

Supported Functions

DNS

Databases

PDO MySQL

PDO PgSQL

PDO Connection Pooling

MySQLi

PostgreSQL (native)

CURL

Sockets

File and Stream I/O

Stream Sockets

Process Execution

Timers and Delays

Output Buffering

Not Yet Supported

DNS

Databases

File Operations (metadata)

What’s Next?