php with postgresql database - php

Question

i wanna to connect to postgresql database using php but it display a blank screen when submit and doesnt execute the query
Thanks in advance
Update: this is my code
function execute_query($dbName,$query){
$host = "localhost";
$user = "postgres";
$pass = "";
$db = "test";
echo "before create connection";
$con = pg_connect ("host=$host dbname=$db user=$user password=$pass");
echo "After connection is created";
if (!$con) {
echo "not connected";
// die('Could not connect: ' . mysql_error());
}
$result = pg_query($con, $query);
pg_close($con);
return $result;
}
The output:
display the message "before connection" but doesn't display the message "After connection is created" or "not connected".

Answer 1

The problem is likely a PHP error that’s getting recorded to a log file somewhere. Locate the log file, or enable showing the log errors on your page by using the following at the top of your script:
ini_set('display_errors', '1');
error_reporting(E_ALL | E_STRICT);
This is a short-term solution and can’t be used in deployment (where you want to set display_errors to 0). For a long-term solution, you really want to locate the Apache or PHP error log and tail it.
To try to find the error log, run the following script:
<?php phpinfo(); ?>
In the Configuration > PHP Core section, look for error_log. If that’s not set, you can set it in your php.ini file. All errors will be recorded to that file, even if you have display_errors set to 0.

Answer 2

Add a php file to your server and put this in that file:
<?php
echo phpinfo();
?>
When you open that file from the browser, check if postgres support is setup for php.
you should something like this on the page:
pgsql
PostgreSQL Support enabled
PostgreSQL(libpq) Version 8.2.3
Multibyte character support enabled
SSL support disabled
Active Persistent Links 0
Active Links 0

Answer 3

Try checking your web server's error log (for instance, /var/log/apache2/error.log is a common location for the Apache2 log) and see if there is an error reported from PHP there.

Answer 4

You may want to set the php error reporting level in your ini file if this is a local development server.

Answer 5

It seems, that your php does not have postgresql support, cf. http://us.php.net/manual/en/ref.pgsql.php:
Note: Not all functions are supported
by all builds. It depends on your
libpq (The PostgreSQL C client
library) version and how libpq is
compiled. If PHP PostgreSQL extensions
are missing, then it is because your
libpq version does not support them.