I'm trying to set up a prepared sql statement with 3 parameters and then execute with array of 3 elements (this is to a postgresql database with postgis):

$result = pg_prepare($dbconn, "my_query", 'INSERT INTO gtest VALUES ($1,
GeomFromText(\'POINT($2 $3)\', 4326))');

$result = pg_execute($dbconn, "my_query", array("phptest", "23", "24"));

But when I ran it, it gave me this error:
Warning: pg_execute(): Query failed: ERROR: bind message supplies 3 parameters, but prepared statement "my_query" requires 1 in /home/dlamoris/phptest.php on line 15

Probably because of the single quotes around the point() function.

Try the heredoc type syntax suggested on http://php.net/pg_prepare:

$my_query = <<<MYQRY
INSERT INTO gtest VALUES($1, GeomFromText('POINT('$2, $3')', 4326));

Also I'd suggest naming the columns in the first part:

insert into gtest(col1, col2, col3) values (....);

so it's always in the same order and you're not relying on any behaviour. If you add a column in the middle of your table later on, this is going to break a lot of your code because the columns will be out of order.

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