<apex:form>

<Button class="col-mx-6  col-md-6" onclick="moveT()">Go to Next Page</Button>

<apex:actionFunction name="movemove" action="{!saveParams}" reRender="panel" oncomplete="moveToNext()">
    <apex:param name="Param1" assignTo="{!Param1}" value=""/>
    <apex:param name="Param2" assignTo="{!Param2}" value=""/>
    <apex:param name="Param3" assignTo="{!Param3}" value=""/>
    <apex:param name="Param4" assignTo="{!Param4}" value=""/>
</apex:actionFunction>
<apex:actionFunction name="moveToPrevious" action="{!moveTo0}"/>
<apex:actionFunction name="moveToNext" action="{!moveTo2}"/>

</apex:form>




public void saveParams(){
    // some data modification
    // No Page related action.
}

public PageReference moveTo2(){
        PageReference pg;
        pg = Page.VFPage2;

        return pg;
}

global class TestExtension {

    static String oId{get; set;}

   public PageReference setoId(){ // called first
        // some action
        Oid = something
        System.debug('oId : ' + Oid); // It shows me value as expected

        return null;
    }

    @RemoteAction        
    global static String bookingInsert(String context){
        System.debug('id : ' + oId); // it shows me null
        return oId;
   }
}

<apex:form id="myform">
            <apex:actionFunction name="moveTo1" action="{!moveTo1}" reRender="myform" status="myStatus"> // reRender is first issue
               <apex:param name="firstparam" assignTo="{!currentC}" value=""/>
               <apex:param name="secondparam" assignTo="{!currentD}" value=""/>
               <apex:param name="thirdparam" assignTo="{!currentT}" value=""/>
            </apex:actionFunction>
            <script>
               function move(){
              moveTo1(document.getElementById('aaa').value, document.getElementById('bbb').value, document.getElementById('ccc').value);
            }
            </script>
         </apex:form>

public PageReference moveTo1(){
        PageReference pg;
        pg = Page.VFpage1;
        pg.setRedirect(false); // Here is another Problem,

        return pg;
    }

<script> 
// Slide Up
$(document).ready(function(){
    $("#btn2").click(function(){
        $("#last").slideUp("slow");
      $("#end").show();
       });
  });
</script>

<apex:form>
	<apex:actionFunction name="runSave" action="{!saveResponse}"/>
  </apex:form>
  	<button class="btn	btn-primary	btn-block" id="btn2" onclick="runSave()"> Submit </button>

<apex:form>
<apex:actionFunction name="setParam" action="{!passParam}" reRender="resultPanel" status="myStatus">
	<apex:param name="firstparam" assignTo="{!s1}" value=""/>
</apex:actionFunction>
</apex:form>

$(".select")
    .click(function(event) {
    	alert($(this).val()),
    	setParam($(this).val());
    })
    ;

<a href="/apex/page2"><div  class="col-xs-6   col-md-4   text-center"><b> Next ></b></div ></a>

<script>
    window.onload = function(){
    	alert({!s1});
    	
    }
</script>

static List<Schedule__c> getScheduleList(){
		return [SELECT ID, Opportunity__c, StartTime__c FROM Schedule__c WHERE Result__c = 'Success' ORDER BY Opportunity__c];
	}

	global Database.QueryLocator start(Database.BatchableContext BC) {
		query = 'SELECT ID FROM CASE';
		return Database.getQueryLocator(query);
	}

   	global void execute(Database.BatchableContext BC, List<sObject> scope) {
   		List<Opportunity> allopps = getOppList();
   		List<Schedule__c> schedules = getScheduleList();

		List<Schedule__c> filtered = new List<Schedule__c>();
        Datetime dt;
        Boolean check;
        Boolean status;

        for ( Opportunity opp : allopps ){
       		dt = null;
 			check = false;
 			status = false;
       		for (Schedule__c schedule : schedules ){	
   				if( check == false && status == true )
   					break;

   				if( schedule.Opportunity__c == opp.id ){
   					check = true;
       				filtered.add(schedule);
       				if( dt == null || schedule.StartTime__c < dt)
       					dt = schedule.StartTime__c;

       				i++;
       			}
       			else if( check == true && status == false){
       				check = false;
       				status = true;
       			}
       		}

       		if( filtered.size() >= 1){
       			opp.SuccessDate__c = dt;
       			opp.StageName = 'Success';
       		}
       		else if( filtered.size() == 0 && opp.StageName == 'Success'){
				opp.SuccessDate__c = null;
				opp.StageName = 'Initial Stage';
       		}
        }

        System.debug('schedule size : ' + schedules.size());
        System.debug('size : ' + allopps.size() + ' count : ' + i);
        /*
		try{
			update allopps;
        }catch( Exception e){
       		System.debug('Error : ' + e.getMessage());
        }
        */
	}

global class TestExtension {

    static String oId{get; set;}

   public PageReference setoId(){ // called first
        // some action
        Oid = something
        System.debug('oId : ' + Oid); // It shows me value as expected

        return null;
    }

    @RemoteAction        
    global static String bookingInsert(String context){
        System.debug('id : ' + oId); // it shows me null
        return oId;
   }
}

<apex:form id="myform">
            <apex:actionFunction name="moveTo1" action="{!moveTo1}" reRender="myform" status="myStatus"> // reRender is first issue
               <apex:param name="firstparam" assignTo="{!currentC}" value=""/>
               <apex:param name="secondparam" assignTo="{!currentD}" value=""/>
               <apex:param name="thirdparam" assignTo="{!currentT}" value=""/>
            </apex:actionFunction>
            <script>
               function move(){
              moveTo1(document.getElementById('aaa').value, document.getElementById('bbb').value, document.getElementById('ccc').value);
            }
            </script>
         </apex:form>

public PageReference moveTo1(){
        PageReference pg;
        pg = Page.VFpage1;
        pg.setRedirect(false); // Here is another Problem,

        return pg;
    }

static List<Schedule__c> getScheduleList(){
		return [SELECT ID, Opportunity__c, StartTime__c FROM Schedule__c WHERE Result__c = 'Success' ORDER BY Opportunity__c];
	}

	global Database.QueryLocator start(Database.BatchableContext BC) {
		query = 'SELECT ID FROM CASE';
		return Database.getQueryLocator(query);
	}

   	global void execute(Database.BatchableContext BC, List<sObject> scope) {
   		List<Opportunity> allopps = getOppList();
   		List<Schedule__c> schedules = getScheduleList();

		List<Schedule__c> filtered = new List<Schedule__c>();
        Datetime dt;
        Boolean check;
        Boolean status;

        for ( Opportunity opp : allopps ){
       		dt = null;
 			check = false;
 			status = false;
       		for (Schedule__c schedule : schedules ){	
   				if( check == false && status == true )
   					break;

   				if( schedule.Opportunity__c == opp.id ){
   					check = true;
       				filtered.add(schedule);
       				if( dt == null || schedule.StartTime__c < dt)
       					dt = schedule.StartTime__c;

       				i++;
       			}
       			else if( check == true && status == false){
       				check = false;
       				status = true;
       			}
       		}

       		if( filtered.size() >= 1){
       			opp.SuccessDate__c = dt;
       			opp.StageName = 'Success';
       		}
       		else if( filtered.size() == 0 && opp.StageName == 'Success'){
				opp.SuccessDate__c = null;
				opp.StageName = 'Initial Stage';
       		}
        }

        System.debug('schedule size : ' + schedules.size());
        System.debug('size : ' + allopps.size() + ' count : ' + i);
        /*
		try{
			update allopps;
        }catch( Exception e){
       		System.debug('Error : ' + e.getMessage());
        }
        */
	}

System.debug('why is not shown2');
System.debug('size 1: ' + flowArr.size());
for( integer i = 0 ; i < flowArr.size() ; i ++ )
	System.debug('Mapping__c : ' + flowArr[i].Mapping__c);

for( integer i = 0 ; i < flow.size() ; i ++ )
	System.debug('Mapping__c2 : ' + flow[i].Mapping__c);

System.debug('why is not shown3');
List<integer> arr = new List<integer>();
//SYstem.debug('flow size : ' + flow.size());
for( integer i = 0 ; i < flow.size() ; i ++ ){
	for( integer j = 0 ; j < flowArr.size() ; j ++ ){
		if( flow[i].Mapping__c == flowArr[j].Mapping__c ){
			arr.add(i);
		}
	}
}

System.debug('why is not shown4');

<apex:page showHeader="true" sidebar="true" controller="Test">
	<apex:form id="fr1">
		<apex:inputTextarea id="text" value="{!text}" cols="4" style="width:100%; height:80px"/><br/>
		From : &nbsp;<apex:outputText value="+565656"/><br/>
		To : &nbsp;<apex:inputText id="to" value="{!to}" style="width:80%"/>
		<apex:commandButton onClick="{!sendSMS}" value="Send Message" immediate="false"/>
	</apex:form>
</apex:page>

public with sharing class Test {
	public TwilioTest() {}
	public String text {get; set;}
	public String to {get; set;}

	public void getsendSMS(){
		String ACCOUNT_SID = 'AAA';
		String AUTH_TOKEN = 'VVV';
		if( to != null ){ <------ what I added to avoid the error.
			String phone_to = '+82'+to.leftPad(1);

			TwilioRestClient client = new TwilioRestClient(ACCOUNT_SID, AUTH_TOKEN);

			Map<String,String> properties = new Map<String,String> {
		        'To'   => phone_to,
		        'From' => '+AAAA,
		        'Body' => text
			};

			TwilioMessage message = client.getAccount().getMessages().create(properties);	
		}
		
	}
}