为什么PHP看不到扩展dll文件？

Question

I am little bit confused with strange behavior of PHP and need advice how to fix it.

I am tring to test pretty simple php script:

$conn = oci_connect($dbUser, $dbPassword, $dbServerName . "/" . $dbName);
if (!$conn) {
    $e = oci_error();
    trigger_error(htmlentities($e['message']), E_USER_ERROR);
}

Unfortunatly it raise me next ERROR:

[22-Oct-2018 19:22:23] PHP Warning:  PHP Startup: Unable to load dynamic library 'F:\PHP_x64\ext\php_oci8_12c.dll' - The specified procedure could not be found.
 in Unknown on line 0
[22-Oct-2018 19:22:23] PHP Fatal error:  Call to undefined function oci_connect() in F:\TEST\complain\test.php on line 8

I have project which is located in IIS web server. Project use PHP Version 5.6.28.

Inside F:\PHP_x64\ext\ folder I have file php_oci8_12c.dll as you can see below:

Inside php.ini file I have uncommented line:

extension=php_oci8_12c.dll

Also in php.ini file I add:

extension_dir = "F:\PHP_x64\ext\"
[PHP_OCI8_12C]
extension=php_oci8_12c.dll

I restart IIS web server several times.

When I try to call php.exe from console it show me next error:

Answer 1

Finally I found solution which work for me.

The code which I use to connect PHP with Oracle:

$conn = oci_connect($dbUser, $dbPassword, "(DESCRIPTION=(ADDRESS_LIST =(ADDRESS=(PROTOCOL = TCP)(HOST=$dbServerName)(PORT = 1521)))(CONNECT_DATA=(SID=$dbSID)))", 'AL32UTF8') or die("Could not connect to ORACLE");

In my case I used SID, you can also use SERVICE_NAME.