PHP Retry

A simple library to retry commands in php.

Installation

This package is available through composer.

composer require jralph/retry

Basic Use

The library includes a simple helper function for ease of use.

Note: On a failure to succeed in running the command, a Jralph\Retry\RetryException will be thrown.

mixed retry (int|callable $attempts , callable $command [, callable $onError = null])

Parameters

• $attempts: The number of times to attempt a command.
  • If a callable is provided, the retry will continue until this closure returns true.
• $command: The command to run each time.
• $onError: An optional callback to run each time the $command fails.

Example

<?php

use function Jralph\Retry\retry;

$result = retry(3, function (int $attempt) {
    // Throwing an error as an example....first 2 attempts will fail.
    if ($attempt < 2) {
        throw new Exception('Just throwing an error as an example!');
    }
    
    return 'Hello World!';
});

// Outputs 'Hello World!'
echo $result;

Advanced Use / Object Use

If you want more flexibility over the retry tool, you can use the Retry object directly and ignore the helper function.

The Retry object is fully chainable to make things simple.

<?php

use Jralph\Retry\Retry;
use Jralph\Retry\Command;

$retry = new Retry(new Command(function (int $attempt) {
    // Throwing an error as an example....first 2 attempts will fail.
    if ($attempt < 2) {
        throw new Exception('Just throwing an error as an example!');
    }
    
    return 'Hello World!';
}));

$result = $retry->attempts(3)->run();

// Outputs 'Hello World!'
echo $result;

Available Methods

• new Retry(Command $command); The Command object to run as the command.
• $retry->attempts(int $attempts); The maximum number of times to attempt the command. Note, an attempt count of 0 will run for ever!
• $retry->wait(int $seconds); The number of seconds to wait between attempts.
• $retry->until(callable $until); Retry until the result of $until returns true. Note: Works well with $retry->attempts(0);
  • Accepts $attempt as the first parameter, giving the current number of attempts.
  • Accepts $response as the second parameter, giving the response of the last attempt.
• $retry->onlyIf(callable $onlyIf); Retry only if the $onlyIf returns true.
  • Accepts $attempt as the first parameter, giving the current number of attempts.
  • Accepts $response as the second parameter, giving the response of the last attempt.
• $retry->onError(callable $onError); A callback to run each time the retry fails.
  • Accepts $attempt as the first parameter, giving the current number of attempts.
  • Accepts $response as the second parameter, giving the response of the last attempt.
• $retry->run(); Run the command using the specified setup.

Change Log

• 3.0.0
  • Updated to php 8.0+.
• 2.0.0
  • Removing of deprecated methods.
  • Removal of once, twice, thrice, forever methods in favour of using attempts(int $attempts).
  • Constructor only accepts Command objects.
• 1.2.0
  • Updated to php 7.1+.
  • Deprecated command method in favour of passing a command object into the constructor.
• 1.1.1
  • Changed all methods using \Closure to use callable instead.
• 1.1.0
  • Added wait(int $seconds); method.