src/php/Arbit/Periodic/CronjobIterator.php
protected function extractStep( $definition )
    {
        if ( ( $position = strpos( $definition, '/' ) ) !== false )
        {
            return (int)substr( $definition, $position + 1 );
        }
        return false;
    }
protected function extractStep( $definition )
    {
        if ( ( $position = strpos( $definition, '/' ) ) !== false )
        {
            return (int)substr( $definition, $position + 1 );
        }
        return false;
    }
Extract the stepping defined by a given cron column

@param mixed $definition Cron definition to use for stepping extraction
@return bool false if the stepping does not exist. Otherwise the step is
returned as an int