PostGIS GeoJSON validator for Yii. Place these files under application/protected/components/

PointValidator.php

<?php
 require_once('SpatialGeoJSONValidator.php');
/**
 * PointValidator class for Yii.
 * Author: Furkan Tektas github.com/furkantektas
 * Date: 2014/09/12
 * Version: v1.0
 * Sample GeoJSON: {"type":"Point","coordinates":[41.00603847483829,29.009458422660828],"crs":{"type":"name","properties":{"name":"EPSG:4326"}}}
 */
class PointValidator extends SpatialGeoJSONValidator {
 	public $geometryType = 'ST_Point';
 	public $geometryName = 'point';
}

PolygonValidator.php

<?php
 require_once('SpatialGeoJSONValidator.php');
/**
 * PolygonValidator class for Yii.
 * Author: Furkan Tektas github.com/furkantektas
 * Date: 2014/09/12
 * Version: v1.0
 * Sample GeoJSON: {"type":"Polygon","coordinates":[[[29.010263085365295,41.00709100018642],[29.006754755973816,41.00742294700135],[29.006711840629578,41.00730959949646],[29.008331894874573,41.004880677538175],[29.012473225593567,41.00445965529471],[29.010263085365295,41.00709100018642]]],"crs":{"type":"name","properties":{"name":"EPSG:4326"}}}
 */
class PolygonValidator extends SpatialGeoJSONValidator {
 	public $geometryType = 'ST_Polygon';
 	public $geometryName = 'polygon';
}

SpatialGeoJSONValidator.php

<?php
 
 /**
 * SpatialGeoJSONValidator class for Yii.
 * Author: Furkan Tektas github.com/furkantektas
 * Date: 2014/09/12
 * Version: v1.0
 */
abstract class SpatialGeoJSONValidator extends CValidator
{
	/**
	 * @var boolean whether the attribute value can be null or empty. Defaults to true,
	 * meaning that if the attribute is empty, it is considered valid.
	 */
	public $allowEmpty=true;
 	const SQL_QUERY_FORMAT_STRING = "SELECT ST_IsValid(ST_GeomFromGeoJSON('%s')), ST_GeometryType(ST_GeomFromGeoJSON('%s'))";
 	const ERROR_MESSAGE = "Invalid %s structure.";
 	public $geometryType = '';
 	public $geometryName = '';
	/**
	 * validateAttribute validates GeoJSON object and it's shape.
	 * $geometryType should be correctly set to work properly.
	 * 
	 * string is not valid, exception is thrown and regarded as invalid GeoJSON object.
	 * @inheritDoc
	 */
	public function validateAttribute($object, $attribute)
	{
		if($this->allowEmpty && $this->isEmpty($object->$attribute))
			return;
		$query = sprintf(SpatialGeoJSONValidator::SQL_QUERY_FORMAT_STRING,trim($object->{$attribute}),trim($object->{$attribute}));
		try {
			$command = Yii::app()->db->createCommand($query)->queryRow();
			if(!$command["st_isvalid"] || $command['st_geometrytype'] != $this->geometryType)
				$this->addError($object, $attribute, SpatialGeoJSONValidator::ERROR_MESSAGE);
		} catch (Exception $e) {
			$this->addError($object, $attribute, sprintf(SpatialGeoJSONValidator::ERROR_MESSAGE,$this->geometryName));
        }
	}
}