Fatal error: Call to undefined function pg_connect - php

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.

Answer 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/)

Answer 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. :)

Answer 3

In my case with
Apache/2.4.10
PHP Version 5.4.32
PostgeSQL 9.3
I added libpq.dll into Apache httpd.conf from PHP catalog because Apache refused to start with libpq.dll from PostgreSQL 9.3