API Reference

API Reference

Authoritative reference for every public class member shipped by initphp/logger. Method signatures are reproduced verbatim from the source; behavioural details correspond to the current main branch.

Class	Namespace	Extends / Implements
Logger	InitPHP\Logger\Logger	Psr\Log\AbstractLogger (final)
FileLogger	InitPHP\Logger\FileLogger	Psr\Log\AbstractLogger
PDOLogger	InitPHP\Logger\PDOLogger	Psr\Log\AbstractLogger
HelperTrait	InitPHP\Logger\HelperTrait	trait (@internal)

All three concrete classes implement Psr\Log\LoggerInterface transitively through AbstractLogger.

---

Logger

final class InitPHP\Logger\Logger extends \Psr\Log\AbstractLogger

Fan-out multiplexer. Forwards every PSR-3 call to every registered inner logger, in registration order. See Multi-Logger for the narrative documentation.

__construct

public function __construct(\Psr\Log\LoggerInterface ...$loggers)

Parameters

Name	Type	Description
$loggers	variadic LoggerInterface	One or more PSR-3 loggers to dispatch to.

Throws

• \InvalidArgumentException — when zero loggers are supplied.
• \TypeError — when any argument is not a Psr\Log\LoggerInterface (raised by PHP at the call site).

Example

new Logger(
    new FileLogger(['path' => '/var/log/app.log']),
    new PDOLogger(['pdo' => $pdo, 'table' => 'logs']),
);

log

public function log($level, string|\Stringable $message, array $context = []): void

Iterates the registered loggers and calls $inner->log($level, $message, $context) on each, in order. Exceptions raised by inner loggers are not caught and abort the rest of the fan-out.

Parameters

Name	Type	Description
$level	mixed (typically a Psr\Log\LogLevel constant)	One of the eight PSR-3 levels.
$message	string|\Stringable	Log message, optionally containing {placeholder} tokens.
$context	array<string, mixed>	Placeholder values. See Context Interpolation.

Throws

• \Psr\Log\InvalidArgumentException — when an inner handler raises it for an unknown level.
• Any exception thrown by an inner handler (e.g. \PDOException).

getLoggers

public function getLoggers(): array

Returns the inner loggers in the order they were registered.

Returns list<\Psr\Log\LoggerInterface>

Inherited helpers

From \Psr\Log\AbstractLogger, all eight delegate to log():

public function emergency(string|\Stringable $message, array $context = []): void;
public function alert    (string|\Stringable $message, array $context = []): void;
public function critical (string|\Stringable $message, array $context = []): void;
public function error    (string|\Stringable $message, array $context = []): void;
public function warning  (string|\Stringable $message, array $context = []): void;
public function notice   (string|\Stringable $message, array $context = []): void;
public function info     (string|\Stringable $message, array $context = []): void;
public function debug    (string|\Stringable $message, array $context = []): void;

---

FileLogger

class InitPHP\Logger\FileLogger extends \Psr\Log\AbstractLogger
{
    use \InitPHP\Logger\HelperTrait;
}

Appends each record as a single line to a file. See FileLogger for the narrative documentation.

__construct

public function __construct(array $options = [])

Parameters

Name	Type	Description
$options	array{path?: string}	Configuration array. Only the path key is read.

Recognised options

Key	Type	Required	Description
path	string	yes	Destination file path. May contain {year}, {month}, {day}, {hour}, {minute}, {second} tokens.

Throws

• \InvalidArgumentException — when path is missing, not a string, or empty.

Example

new FileLogger(['path' => __DIR__ . '/logs/app-{year}-{month}-{day}.log']);

log

public function log($level, string|\Stringable $message, array $context = []): void

Writes exactly one line of the form:

<ISO-8601 timestamp> [<UPPERCASE-LEVEL>] <interpolated message>\n

Parameters

Name	Type	Description
$level	mixed (typically a Psr\Log\LogLevel constant)	One of the eight PSR-3 levels.
$message	string|\Stringable	Log message with optional placeholders.
$context	array<string, mixed>	Placeholder values.

Throws

• \Psr\Log\InvalidArgumentException — when $level is not a recognised PSR-3 level.

Failure modes (silent)

• Failure to create the parent directory → error_log() notice, no exception.
• Failure of file_put_contents() → error_log() notice, no exception.

Concurrency: writes use FILE_APPEND | LOCK_EX.

getPath

public function getPath(): string

Returns the destination file path after token interpolation.

Returns string

Example

$logger = new FileLogger(['path' => '/var/log/app-{year}.log']);
$logger->getPath();   // "/var/log/app-2026.log"

Properties

Visibility	Name	Type	Description
protected	$path	string	Token-resolved destination path.

---

PDOLogger

class InitPHP\Logger\PDOLogger extends \Psr\Log\AbstractLogger
{
    use \InitPHP\Logger\HelperTrait;
}

Inserts each record as a row in a relational table. See PDOLogger for the narrative documentation.

__construct

public function __construct(array $options = [])

Parameters

Name	Type	Description
$options	array{pdo?: \PDO, table?: string}	Configuration array.

Recognised options

Key	Type	Required	Description
pdo	\PDO	yes	Configured PDO connection.
table	string	yes	Destination table name. Must match /^[A-Za-z_][A-Za-z0-9_]*$/.

Throws (all \InvalidArgumentException)

• pdo key missing
• pdo not a PDO instance
• table key missing
• table empty / not a string
• table fails the identifier regex

The exact messages are listed in PDOLogger › Validation.

log

public function log($level, string|\Stringable $message, array $context = []): void

Inserts one row:

INSERT INTO <table> (level, message, date) VALUES (?, ?, ?)

with level uppercased, message interpolated, date formatted as Y-m-d H:i:s at insertion time. Bound through prepared statements.

Throws

• \Psr\Log\InvalidArgumentException — unknown level.
• \PDOException — any database failure (connection lost, table missing, permission denied, …). Not swallowed; see Error Handling › Database failures.

getTable

public function getTable(): string

Returns the configured destination table name.

Returns string

Properties

Visibility	Name	Type	Description
protected	$pdo	\PDO	The supplied PDO connection.
protected	$table	string	Validated table name.

Class constants

Visibility	Name	Type	Value
private	TABLE_NAME_PATTERN	string	/^[A-Za-z_][A-Za-z0-9_]*$/

---

HelperTrait

trait InitPHP\Logger\HelperTrait

Note. Marked @internal. The trait is part of the implementation surface of the bundled handlers and may shift between patch releases. Reusing it in your own handlers is supported but at your own risk — there is no compatibility guarantee.

interpolate

protected function interpolate(string|\Stringable $message, array $context = []): string

Expands {placeholder} tokens. Rendering rules:

Value type	Rendered as
null	""
true, false	"true", "false"
int, float, string	(string) $value
\Stringable	(string) $value
\Throwable	"<Class>(<code>): <message> in <file>:<line>"
arrays	placeholder left untouched
non-stringable objects	placeholder left untouched

Non-string context keys are skipped. See Context Interpolation for examples.

Returns string

getDate

protected function getDate(string $format = 'c'): string

Returns the current time formatted with DateTimeImmutable::format(). Defaults to ISO-8601 with offset ('c').

Returns string

logLevelVerify

protected function logLevelVerify(mixed $level): void

Validates that $level is one of the eight PSR-3 level strings, comparing case-insensitively.

Throws \Psr\Log\InvalidArgumentException on failure.

PHPStan note. The trait carries a @phpstan-assert string $level annotation, so after calling logLevelVerify($level) static analysers know $level is a string.

Internal properties

Visibility	Name	Type	Description
private	$levels	list<string>	The eight canonical PSR-3 level strings, in severity order.

---

Exception types at a glance

Where?	Exception	When?
Logger::__construct	\InvalidArgumentException	Zero loggers.
Logger::__construct	\TypeError	Non-LoggerInterface argument (PHP-enforced).
FileLogger::__construct	\InvalidArgumentException	path missing / empty / non-string.
PDOLogger::__construct	\InvalidArgumentException	pdo or table missing/wrong/invalid.
*Logger::log()	\Psr\Log\InvalidArgumentException	Unknown level.
PDOLogger::log()	\PDOException	Backend failure (propagated).
Logger::log()	(inner exception verbatim)	Inner handler raised.

Related

• Narrative docs: Multi-Logger, FileLogger, PDOLogger.
• PSR-3 Compliance and Error Handling for behavioural details.
• Custom Handlers › Guidelines for writing handlers that match the conventions above.