Better way to perform search/replace inside php upstream only

src/modules/debug/ee_mod_debug_php.sh

@@ -3,10 +3,10 @@
 function ee_mod_debug_php()
 {
 	if [ "$1" = "start" ]; then
-		grep -B2 9001 /etc/nginx/conf.d/upstream.conf | grep php &>> $EE_COMMAND_LOG
+		sed -n "/upstream php {/,/}/p" /etc/nginx/conf.d/upstream.conf | grep 9001 &>> $EE_COMMAND_LOG
 		if [ $? -ne 0 ]; then
 			ee_lib_echo "Setup PHP5-FPM slow log, please wait..."
-			sed -i "5 s/9000/9001/" /etc/nginx/conf.d/upstream.conf \
+			sed -i "/upstream php {/,/}/s/9000/9001/" /etc/nginx/conf.d/upstream.conf \
 			|| ee_lib_error "Unable to setup PHP5-FPM slow log, exit status = " $?
 
 			# NGINX reload trigger
@@ -16,10 +16,10 @@ function ee_mod_debug_php()
 			ee_lib_echo "PHP5-FPM slow log already enabled"
 		fi
 	elif [ "$1" = "stop" ]; then
-		grep -B2 9001 /etc/nginx/conf.d/upstream.conf | grep php &>> $EE_COMMAND_LOG
+		sed -n "/upstream php {/,/}/p" /etc/nginx/conf.d/upstream.conf | grep 9001 &>> $EE_COMMAND_LOG
 		if [ $? -eq 0 ]; then
 			ee_lib_echo "Disable PHP5-FPM slow log, please wait..."
-			sed -i "5 s/9001/9000/" /etc/nginx/conf.d/upstream.conf \
+			sed -i "/upstream php {/,/}/s/9001/9000/" /etc/nginx/conf.d/upstream.conf  \
 			|| ee_lib_error "Unable to disable PHP5-FPM slow log, exit status = " $?
 
 			# NGINX reload trigger