epts an array.
	 * @return bool True if of type, False if not
	 */
	private function is_type( $type = '' ) {

		// If string, cast to array
		if ( is_string( $type ) ) {
			$type = (array) $type;
		}

		// Make them lowercase
		$types = array_map( 'strtolower', $type );

		// Return if match or not
		return (bool) in_array( strtolower( $this->type ), $types, true );
	}

	/** Private Sanitizers ****************************************************/

	/**
	 * Sanitize capabilities array
	 *
	 * @since 1.0.0
	 * @param array $caps Default empty array.
	 * @return array
	 */
	private function sanitize_capabilities( $caps = array() ) {
		return wp_parse_args( $caps, array(
			'select' => 'exist',
			'insert' => 'exist',
			'update' => 'exist',
			'delete' => 'exist'
		) );
	}

	/**
	 * Sanitize aliases array using `sanitize_key()`
	 *
	 * @since 1.0.0
	 * @param array $aliases Default empty array.
	 * @return array
	 */
	private function sanitize_aliases( $aliases = array() ) {
		return array_map( 'sanitize_key', $aliases );
	}

	/**
	 * Sanitize relationships array
	 *
	 * @todo
	 * @since 1.0.0
	 * @param array $relationships Default empty array.
	 * @return array
	 */
	private function sanitize_relationships( $relationships = array() ) {
		return array_filter( $relationships );
	}

	/**
	 * Sanitize the default value
	 *
	 * @since 1.0.0
	 * @param string $default
	 * @return string|null
	 */
	private function sanitize_default( $default = '' ) {

		// Null
		if ( ( true === $this->allow_null ) && is_null( $default ) ) {
			return null;

		// String
		} elseif ( is_string( $default ) ) {
			return wp_kses_data( $default );

		// Integer
		} elseif ( $this->is_numeric() ) {
			return (int) $default;
		}

		// @todo datetime, decimal, and other column types

		// Unknown, so return the default's default
		return '';
	}

	/**
	 * Sanitize the pattern
	 *
	 * @since 1.0.0
	 * @param string $pattern
	 * @return string
	 */
	private function sanitize_pattern( $pattern = '%s' ) {

		// Allowed patterns
		$allowed_patterns = array( '%s', '%d', '%f' );

		// Return pattern if allowed
		if ( in_array( $pattern, $allowed_patterns, true ) ) {
			return $pattern;
		}

		// Fallback to digit or string
		return $this->is_numeric()
			? '%d'
			: '%s';
	}

	/**
	 * Sanitize the validation callback
	 *
	 * @since 1.0.0
	 * @param string $callback Default empty string. A callable PHP function name or method
	 * @return string The most appropriate callback function for the value
	 */
	private function sanitize_validation( $callback = '' ) {

		// Return callback if it's callable
		if ( is_callable( $callback ) ) {
			return $callback;
		}

		// UUID special column
		if ( true === $this->uuid ) {
			$callback = array( $this, 'validate_uuid' );

		// Datetime fallback
		} elseif ( $this->is_type( 'datetime' ) ) {
			$callback = array( $this, 'validate_datetime' );

		// Decimal fallback
		} elseif ( $this->is_type( 'decimal' ) ) {
			$callback = array( $this, 'validate_decimal' );

		// Intval fallback
		} elseif ( $this->is_numeric() ) {
			$callback = 'intval';
		}

		// Return the callback
		return $callback;
	}

	/** Public Validators *****************************************************/

	/**
	 * Fallback to validate a datetime value if no other is set.
	 *
	 * This assumes NO_ZERO_DATES is off or overridden.
	 *
	 * If MySQL drops support for zero dates, this method will need to be
	 * updated to support different default values based on the environment.
	 *
	 * @since 1.0.0
	 * @param string $value Default ''. A datetime value that needs validating
	 * @return string A valid datetime value
	 */
	public function validate_datetime( $value = '' ) {

		// Handle "empty" values
		if ( empty( $value ) || ( '0000-00-00 00:00:00' === $value ) ) {
			$value = ! empty( $this->default )
				? $this->default
				: '';

		// Convert to MySQL datetime format via gmdate() && strtotime
		} elseif ( function_exists( 'gmdate' ) ) {
			$value = gmdate( 'Y-m-d H:i:s', strtotime( $value ) );
		}

		// Return the validated value
		return $value;
	}

	/**
	 * Validate a decimal
	 *
	 * (Recommended decimal column length is '18,9'.)
	 *
	 * This is used to validate a mixed value before it is saved into a decimal
	 * column in a database table.
	 *
	 * Uses number_format() which does rounding to the last decimal if your
	 * value is longer than specified.
	 *
	 * @since 1.0.0
	 * @param mixed $value    Default empty string. The decimal value to validate
	 * @param int   $decimals Default 9. The number of decimal points to accept
	 * @return float
	 */
	public function validate_decimal( $value = 0, $decimals = 9 ) {

		// Protect against non-numeric values
		if ( ! is_numeric( $value ) ) {
			$value = 0;
		}

		// Protect against non-numeric decimals
		if ( ! is_numeric( $decimals ) ) {
			$decimals = 9;
		}

		// Is the value negative?
		$negative_exponent = ( $value < 0 )
			? -1
			: 1;

		// Only numbers and period
		$value = preg_replace( '/[^0-9\.]/', '', (string) $value );

		// Format to number of decimals, and cast as float
		$formatted = number_format( $value, $decimals, '.', '' );

		// Adjust for negative values
		$retval = $formatted * $negative_exponent;

		// Return
		return $retval;
	}

	/**
	 * Validate a UUID.
	 *
	 * This uses the v4 algorithm to generate a UUID that is used to uniquely
	 * and universally identify a given database row without any direct
	 * connection or correlation to the data in that row.
	 *
	 * From http://php.net/manual/en/function.uniqid.php#94959
	 *
	 * @since 1.0.0
	 * @param string $value The UUID value (empty on insert, string on update)
	 * @return string Generated UUID.
	 */
	public function validate_uuid( $value = '' ) {

		// Default URN UUID prefix
		$prefix = 'urn:uuid:';

		// Bail if not empty and correctly prefixed
		// (UUIDs should _never_ change once they are set)
		if ( ! empty( $value ) && ( 0 === strpos( $value, $prefix ) ) ) {
			return $value;
		}

		// Put the pieces together
		$value = sprintf( "{$prefix}%04x%04x-%04x-%04x-%04x-%04x%04x%04x",

			// 32 bits for "time_low"
			mt_rand( 0, 0xffff ), mt_rand( 0, 0xffff ),

			// 16 bits for "time_mid"
			mt_rand( 0, 0xffff ),

			// 16 bits for "time_hi_and_version",
			// four most significant bits holds version number 4
			mt_rand( 0, 0x0fff ) | 0x4000,

			// 16 bits, 8 bits for "clk_seq_hi_res",
			// 8 bits for "clk_seq_low",
			// two most significant bits holds zero and one for variant DCE1.1
			mt_rand( 0, 0x3fff ) | 0x8000,

			// 48 bits for "node"
			mt_rand( 0, 0xffff ), mt_rand( 0, 0xffff ), mt_rand( 0, 0xffff )
		);

		// Return the new UUID
		return $value;
	}

	/** Table Helpers *********************************************************/

	/**
	 * Return a string representation of what this column's properties look like
	 * in a MySQL.
	 *
	 * @todo
	 * @since 1.0.0
	 * @return string
	 */
	public function get_create_string() {

		// Default return val
		$retval = '';

		// Bail if no name
		if ( ! empty( $this->name ) ) {
			$retval .= $this->name;
		}

		// Type
		if ( ! empty( $this->type ) ) {
			$retval .= " {$this->type}";
		}

		// Length
		if ( ! empty( $this->length ) ) {
			$retval .= '(' . $this->length . ')';
		}

		// Unsigned
		if ( ! empty( $this->unsigned ) ) {
			$retval .= " unsigned";
		}

		// Zerofill
		if ( ! empty( $this->zerofill ) ) {
			// TBD
		}

		// Binary
		if ( ! empty( $this->binary ) ) {
			// TBD
		}

		// Allow null
		if ( ! empty( $this->allow_null ) ) {
			$retval .= " NOT NULL ";
		}

		// Default
		if ( ! empty( $this->default ) ) {
			$retval .= " default '{$this->default}'";

		// A literal false means no default value
		} elseif ( false !== $this->default ) {

			// Numeric
			if ( $this->is_numeric() ) {
				$retval .= " default '0'";
			} elseif ( $this->is_type( 'datetime' ) ) {
				$retval .= " default '0000-00-00 00:00:00'";
			} else {
				$retval .= " default ''";
			}
		}

		// Extra
		if ( ! empty( $this->extra ) ) {
			$retval .= " {$this->extra}";
		}

		// Encoding
		if ( ! empty( $this->encoding ) ) {

		} else {

		}

		// Collation
		if ( ! empty( $this->collation ) ) {

		} else {

		}

		// Return the create string
		return $retval;
	}
}
<br />
<b>Fatal error</b>:  Uncaught Error: Class 'WP_Rocket\Dependencies\Database\Column' not found in /home/merciket/public_html/wp-content/plugins/wp-rocket/inc/Dependencies/Database/Schema.php:54
Stack trace:
#0 /home/merciket/public_html/wp-content/plugins/wp-rocket/inc/Dependencies/Database/Query.php(407): WP_Rocket\Dependencies\Database\Schema-&gt;__construct()
#1 /home/merciket/public_html/wp-content/plugins/wp-rocket/inc/Dependencies/Database/Query.php(326): WP_Rocket\Dependencies\Database\Query-&gt;set_columns()
#2 /home/merciket/public_html/wp-content/plugins/wp-rocket/inc/Engine/Preload/Database/Queries/Cache.php(111): WP_Rocket\Dependencies\Database\Query-&gt;__construct(Array)
#3 [internal function]: WP_Rocket\Engine\Preload\Database\Queries\Cache-&gt;__construct(Object(WP_Rocket\Logger\Logger))
#4 /home/merciket/public_html/wp-content/plugins/wp-rocket/inc/Dependencies/League/Container/Definition/Definition.php(256): ReflectionClass-&gt;newInstanceArgs(Array)
#5 /home/merciket/public_html/wp-content/plugins/wp-rocket/inc/Dependencies/Le in <b>/home/merciket/public_html/wp-content/plugins/wp-rocket/inc/Dependencies/Database/Schema.php</b> on line <b>54</b><br />