Question

I’m writing a client for a postgreSQL database with PostGIS functions. this client of course communicates through php. However I’m looking for a proper documentations for available postGIS functions that i can call from my php files.

I would really appreciate if I could get a simple example of how postGIS function is integrated in php.

Cheers 🙂

Answer 1

Postgis are stored procedures available at some schema in your postgresql database.
If you have PDO you can write procedures that call then quite close like objects.
See PHP PDO for fetch modes available.

<?php
require_once 'constants.php';
class Postgis extends PDO
{
  public function __construct()
  {
    $this->pg = new PDO( PDO_DB_DSN );
    $this->pg->setAttribute( PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION );
  }
  public function makePoint( $x, $y )
  {
    $preparedStatement = $this->pg->prepare( 'SELECT public.st_makepoint( ?, ? )' );
    $preparedStatement->execute( array( $x, $y ) );
    return $preparedStatement->fetchColumn();
  }
}

try
{
  $postgis = new Postgis();
  $point = $postgis->makePoint( 34, 44 ); //point holds the binary string of a point without srid
  var_dump( $point );
}
catch ( PDOException $e )
{
  // any errors here
  var_dump( $e->getMessage() );
}
?>