error PHP snmpget

[kknm]

Updated Ubuntu 18.04 to 20.04
Previously the SNMP procedure worked correctly:
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$param = json_decode(base64_decode('#param#')); // retrieve the parameters
$host = $param-ip;

$pCountTotal = '1.3.6.1.2.1.43.10.2.1.4.1.1';
$phHostName_HP = '1.3.6.1.2.1.1.5.0';
$place = '1.3.6.1.2.1.1.6.0';
$capacity = '1.3.6.1.2.1.43.11.1.1.8.1.1';
$ostatok = '1.3.6.1.2.1.43.11.1.1.9.1.1';
$cyan = '1.3.6.1.2.1.43.11.1.1.8.1.2';
$mgent = '1.3.6.1.2.1.43.11.1.1.8.1.3';
$yell = '1.3.6.1.2.1.43.11.1.1.8.1.4';
$manuf = '1.3.6.1.2.1.1.1.0';
$ost_c = '1.3.6.1.2.1.43.11.1.1.9.1.2';
$ost_m = '1.3.6.1.2.1.43.11.1.1.9.1.3';
$ost_y = '1.3.6.1.2.1.43.11.1.1.9.1.4';
//$host='192.168.1.134';
$community='public';
//$community_write='private';
//snmp_set_quick_print (0); #Changing the output format to full
$tot=@snmpget($host,$community, $pCountTotal);

if ($tot) {
    $page = explode(':', $tot);
    $js = 'parent.$('#obz_str').val($page[1]).change(); ';
    nuJavascriptCallback($js);
    }else{
    $js = 'parent.$('#obz_str').val(0).change(); ';
    nuJavascriptCallback($js);
}

Now the error:
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Procedure SNMP

/var/www/kknmkomp/core/nucommon.php(1408) : eval()'d code
Call to undefined function snmpget()

Traced from...

(line:104) /var/www/kknmkomp/core/nuapi.php - nuRunPHPHidden

(line:396) /var/www/kknmkomp/core/nucommon.php - nuRunPHP

(line:427) /var/www/kknmkomp/core/nucommon.php - nuEval

(line:1408) /var/www/kknmkomp/core/nucommon.php - eval

Where to look for an error in Ubuntu or in nuBuilder ver.V.4.5-2023.09.18.02?

[kev1n]

I asked ChatGPT:

The error "Call to undefined function snmpget()" indicates that the `snmpget()` function is not available in your PHP environment. This typically occurs because the SNMP (Simple Network Management Protocol) functions are not enabled or the required SNMP extension is not installed.

Here's a step-by-step guide to resolve this issue:

### 1. Verify PHP Version
First, ensure you are using a version of PHP that supports the SNMP functions. SNMP support is available in PHP 4.3.0 and later.

### 2. Check PHP Configuration
Ensure that the SNMP extension is enabled in your PHP configuration. The SNMP functions are part of the `php-snmp` extension. You can check this in your `php.ini` file.

- Windows: Open your `php.ini` file and look for the line:

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;extension=php_snmp.dll

Remove the semicolon (`;`) to uncomment the line:

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extension=php_snmp.dll

- Linux/Unix: Open your `php.ini` file and look for the line:

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  ;extension=snmp.so
  

Remove the semicolon (`;`) to uncomment the line:

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  extension=snmp.so
  

### 3. Install SNMP Extension
If the extension is not present in your `php.ini` file, you might need to install it.

- On Windows:
- Ensure you have the `php_snmp.dll` file in your PHP extensions directory.
- Add the following line to your `php.ini` file:

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    extension=php_snmp.dll
    

- On Linux/Unix:
- Install the SNMP extension using your package manager. For example, on Ubuntu or Debian, you can install it using:

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    sudo apt-get install php-snmp
    

For CentOS or RHEL:

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    sudo yum install php-snmp
    

- After installation, restart your web server:

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    sudo systemctl restart apache2  # for Apache
    sudo systemctl restart nginx    # for Nginx
    

### 4. Verify Extension is Loaded
You can verify that the SNMP extension is loaded by creating a PHP file (e.g., `phpinfo.php`) with the following content:

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<?php
phpinfo();
?>

Access this file through your web browser. Search for "snmp" in the output to confirm that the SNMP extension is enabled.

### 5. Testing `snmpget()`
After ensuring the extension is enabled, test the `snmpget()` function in a PHP script:

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<?php
$ip = "127.0.0.1";
$community = "public";
$oid = "1.3.6.1.2.1.1.1.0";  // Example OID

$result = snmpget($ip, $community, $oid);

if ($result === false) {
    echo "SNMP get failed.";
} else {
    echo "SNMP get succeeded: $result";
}
?>

### Summary
The steps to resolve the "Call to undefined function snmpget()" error involve ensuring the SNMP extension is installed and enabled in your PHP environment. Verify your PHP version, update your `php.ini` configuration, install the necessary packages, and check that the extension is correctly loaded. Following these steps should enable you to use the `snmpget()` function without issues.

[kknm]

Very strange...
When updating I did not change the PHP7.4 and apache version. Unfortunately, I can no longer check whether the php-snmp module was enabled, but in php.ini extension=snmp.so was commented out. Now I installed php-snmp, php8.1-snmp was installed automatically, but php7.4-snmp cannot be installed due to dependencies. Removing the comment in php.ini does nothing.

[kev1n]

That issue isn't directly related to nuBuilder itself, but rather to the PHP version, dependencies, and settings. It might be more suitable to ask your question on platforms like Stack Overflow, where there are numerous experts available to assist.

[kknm]

I solved the problem using the usual
snmp and shell_exec.

$tot=shell_exec(snmpwalk -v2c -c public '.$host.' '.$pCountTotal)