hollodotme/crontab-validator

A validator for crontab expressions.

, _(*1)

CrontabValidator

A validator for crontab expressions., _(*2)

Sources used to determine the allowed expressions:, _(*3)

• https://crontab.guru/
• https://en.wikipedia.org/wiki/Cron

Features

• Validation of crontab expressions like 6,21,36,51 7-23/1 * FEB-NOV/2 *.

Requirements

• PHP >= 7.1

Installation

composer require "hollodotme/crontab-validator"

Usage

Boolean validation

<?php declare(strict_types=1);

namespace MyVendor\MyProject;

use hollodotme\CrontabValidator\CrontabValidator;

$validator = new CrontabValidator();

if ( $validator->isExpressionValid( '6,21,36,51 7-23/1 * FEB-NOV/2 *' ) )
{
    echo 'Expression is valid.';
}
else
{
    echo 'Expression is invalid.';  
}

Guarding

<?php declare(strict_types=1);

namespace MyVendor\MyProject;

use hollodotme\CrontabValidator\CrontabValidator;
use hollodotme\CrontabValidator\Exceptions\InvalidExpressionException;

$validator = new CrontabValidator();

try 
{
    # => All fine, execution continues
    $validator->guardExpressionIsValid( '6,21,36,51 7-23/1 * FEB-NOV/2 *' );

    # => This will raise an InvalidExpressionException
    $validator->guardExpressionIsValid( 'this is not a valid interval' );
}
catch ( InvalidExpressionException $e )
{
    echo $e->getMessage();
}

Prints:, _(*4)

Invalid crontab expression: "this is not a valid interval"

Feedback and contributions welcome!, _(*5)