Group section with odd even method

odd_even_section.php

<?php $number =1; ?>
  @foreach($links as $key => $value)				
    @if($number % 4 == 1 )
    [
    @endif
    <h1>{{ $number.'-' }}</h1>
    @if($number % 4 == 0 && $number > 0)
      ]
    @endif
  <?php $number++; ?>
  @endforeach

<script>
  $('.nav-previous').click(function(){
				var current = $(this).attr('id');
				if (typeof current == "undefined" ) {
					var number = 5;
				}else{
					var number = current;
					if (number > 0) {
						number = parseInt(number) - 4;
					}
				}
				$(this).attr('id',number);
				$('.nav-next').attr('id',number);
				$(this).attr('href','#tab-'+number);

			});

			$('.nav-next').click(function(){
				var current = $(this).attr('id');
				if (typeof current == "undefined" ) {
					var number = 5;
				}else{
					var number 	= current;
					number = parseInt(number) + 4;
				}

				$(this).attr('id',number);
				$('.nav-previous').attr('id',number);
				$(this).attr('href','#tab-'+number);
			//return false;
			
		});
</script>