Fatal error: Call to undefined function pg_connect

Question

I am using Windows 7, php 5.3.5 and WAMP server. I have two php files: trigger.php and background.php.
I want to run background.php as a background process. I have to call this file from trigger.php. To accomplish this I used below method. I included following code in trigger.php to make background.php to process in background.

$handle = popen('start /b C:\wamp\bin\php\php5.3.5\php.exe     C:\wamp\www\email3.php','r');

in background.php I have the follwing code to connect to database.

$conn_string = "host=localhost port=5432 dbname=tagbase user=postgres password=postgres";  

now, on parsing this line am getting the follwing error :

Fatal error: Call to undefined function pg_connect() in C:\wamp\www\background.php on line 3 Call Stack: 0.0002 322792 1. {main}() C:\wamp\www\background.php:0

By searching in in the internet I found some solutions, and made changes as recommended below in php.ini,

uncommented, extension=php_pdo_pgsql.dll,
uncommented, extension=php_pgsql.dll,
uncommented, extension_dir = "c:/wamp/bin/php/php5.3.5/ext/",

also I do have php_pdo_pgsql.dll and php_pgsql.dll files in c:/wamp/bin/php/php5.3.5/ext/ folder.

Any suggestions are appreciated.

Solution 1

Apache 2.2.X configuration

Add the next line to the Apache 2.2.x httpd.conf configuration:

LoadFile "C:/Program Files/PostgreSQL/{version}/bin/libpq.dll"

Above line must be entered before the next line.

LoadModule php5_module "c:/wamp/bin/php/php5.2.11/php5apache2_2.dll"

PHP 5.2.X Configuration

Enable the following two lines in the php.ini configuration file. By 'Enable' i mean, remove trailing ; (semicolon). By these, you un-comment the line.

extension=php_pdo_pgsql.dll
extension=php_pgsql.dll

Restart WAMP

Test by adding this in your index.php

echo extension_loaded('pgsql') ? 'yes':'no';

(source: http://www.plaatsoft.nl/wamp-postgresql-integration/)

Solution 2

if we install WAMP server, we will get two php.ini files. one in C:\wamp\bin\php\php5.3.5 and another in C:\wamp\bin\apache\Apache2.2.17\bin.

if we execute a php file from browser, then php.ini file in C:\wamp\bin\apache\Apache2.2.17\bin will be referred. if we execute a php file from command line, then php.ini file in C:\wamp\bin\php\php5.3.5 will be referred.

what ever the changes i made enable/disable the dll in PHP->PHP extensions,all the changes will be saved in C:\wamp\bin\apache\Apache2.2.17\bin\php.ini file. but C:\wamp\bin\php\php5.3.5\php.ini file remains unchanged.

for my problem, i made the following changes

uncommented, extension=php_pdo_pgsql.dll,
uncommented, extension=php_pgsql.dll,
uncommented, extension_dir = "c:/wamp/bin/php/php5.3.5/ext/",

in C:\wamp\bin\php\php5.3.5\php.ini file. Now its working good. :)

Comments

[BattleBit]

do you enable this extensions in php.ini and restart server ?)

[Shashidhar Gr]

yes Mr.BattleBit. i enabled. but same error.

[StefanNch]

in your apache config file put this Loadfile "C:\php\libpq.dll". Also check the documentation: php.net/manual/en/pgsql.setup.php

[Shashidhar Gr]

hi Mr.jordi kroon, as you suggested when i included the following in httpd.conf file : lineLoadFile “C:/Program Files/PostgreSQL/9.1/bin/libpq.dll”, my server itself is not restarting properly. And LoadModule php5_module “c:/wamp/bin/php/php5.3.5/php5apache2_2.dll” already present in that configuration file.

[Jordi Kroon]

The load file.. should point to the libpq.dll. Check the path.

[Shashidhar Gr]

i checked. path is correct. LoadFile "C:/Program Files/PostgreSQL/9.1/bin/libpq.dll",since in the path "Program Files" contains space ,am i suppose to escape that space.?

[Jordi Kroon]

No, since there are quotes arround them. Check your apache error logs.

[Shashidhar Gr]

apache error logs also contains same error:PHP Fatal error: Call to undefined function pg_connect() in C:\wamp\www\background.php on line 3 PHP Stack trace: PHP 1. {main}() C:\wamp\www\background.php:0 [Wed Feb 13 14:50:53 2013] [error] [client 127.0.0.1] File does not exist: C:/wamp/www/favicon.ico

[Vael Victus]

This did it for me, thanks. Some users may need to beware of the quotes Jordi has used in his answer; use these: " "

[Jordi Kroon]

Thanks, quotes changed.

[Milos]

Just so that anyone else reading this doesn't mess up: on Windows you need forward slashes to make it work, so : LoadFile "C:\Program Files\PostgreSQL\{version}\bin\libpq.dll"