Fixing #5554 - Extra '=' Removed from SNMP output

CHANGELOG

@@ -111,6 +111,7 @@ Cacti CHANGELOG
 -issue#5527: Upgrade from 0.8.8 to 1.2.25 (latest) fails on db upgrade due to missing data source profile id
 -issue#5534: When deleting a single Data Source the table data_debug is not purged
 -issue#5542: When a form element does not include a 'value' column, provide a more helpful warning message 
+-issue#5554: Interface description with equal sign (=) in ifAlias does not show Alias
 
 1.2.25
 -security#GHSA-77rf-774j-6h3p: Protect against Insecure deserialization of filter data

lib/snmp.php

@@ -752,7 +752,7 @@ function format_snmp_string($string, $snmp_oid_included, $value_output_format =
 
 	if ($snmp_oid_included) {
 		/* strip off all leading junk (the oid and stuff) */
-		$string_array = explode('=', $string);
+		$string_array = explode('=', $string, 1);
 
 		if (cacti_sizeof($string_array) == 1) {
 			/* trim excess first */
@@ -850,7 +850,6 @@ function format_snmp_string($string, $snmp_oid_included, $value_output_format =
 		 * and hex-string: from the passed value
 		 */
 		$output = '';
-
 		$parts  = explode(' ', $string);
 
 		if (cacti_sizeof($parts) == 4) {
@@ -898,12 +897,11 @@ function format_snmp_string($string, $snmp_oid_included, $value_output_format =
 			$possible_ip = false;
 		}
 	} elseif (substr(strtolower($string), 0, 4) == 'hex:') {
-		$output = '';
-
 		/* strip off the 'Hex:' */
 		$string = trim(str_ireplace('hex:', '', $string));
 
 		/* normalize some forms */
+		$output = '';
 		$string = str_replace(array(' ', '-', '.'), ':', $string);
 		$parts  = explode(':', $string);