Вы можете попробовать следующее:
//custom date for example
$d1 = new DateTime("2012-07-08");
$d2 = new DateTime("2012-07-11");
$d3 = new DateTime("2012-07-08");
$d4 = new DateTime("2012-07-15");
//create a date period object
$interval = new DateInterval('P1D');
$daterange = iterator_to_array(new DatePeriod($d1, $interval, $d2));
$daterange1 = iterator_to_array(new DatePeriod($d3, $interval, $d4));
array_map(function($v) use ($daterange1) { if(in_array($v, $daterange1)) print "Bingo!";}, $daterange);
$(document).ready(function(){
var i=0;
$('#addmoreEdu').click(function(){
i++;
$('#dynamic_field').append('<div class="row"><div id="row'+i+'"><div class="col s12 m12 "><label for="title">Certificate Title</label><textarea class="materialize-textarea" style="padding: 0px;" id="title'+i+'" name="title[]">Secondary School Certificate</textarea></div><div class="col s12 m12 "><label for="title">School / College, City</label><textarea id="location'+i+'" name="location[]" class="materialize-textarea" style="padding: 0px;"></textarea></div><div class="col s3 m3 "><label for="title">Marks</label><input id="marks'+i+'" name="marks[]" type="text" value="" /></div><div class="col s3 m3 "><label for="title">Division</label><input id="divsion'+i+'" name="divsion[]" type="text" value="" placeholder="1st" /></div><div class="col s3 m3 "><label for="title">Year</label><select name="year[]"><option value="2019" selected>2019</option><option value="2018">2018</option><option value="2017">2017</option><option value="2016">2016</option><option value="2015">2015</option></select></div><div class="col s3 m3"><button type="button" name="remove" id="'+i+'" class="btn btn-danger button btn_remove">X</button></div></div></div>');
$('.btn_remove').click(function(){
var button_id = $(this).attr("id");
$('#row'+button_id+'').remove();
});
});
});
#dynamic_field > div:nth-of-type(even) {
background: #f5f5f5;
}
<div id="dynamic_field">
<div class="row">
<div class="col s12" style="padding-top: 12px;">
<div class="col s12 m12 "><label for="title">Certificate Title</label>
<textarea class="materialize-textarea" style="padding: 0px;" id="title" name="title[]">Higher School Secondary Certificate</textarea>
</div>
<div class="col s12 m12 "><label for="title">School / College, City</label>
<textarea id="location" name="location[]" class="materialize-textarea" style="padding: 0px;"></textarea>
</div>
<div class="col s3 m3 "><label for="title">Marks</label>
<input id="marks" name="marks[]" type="text" value="" />
</div>
<div class="col s3 m3 "><label for="title">Division</label>
<input id="divsion" name="divsion[]" type="text" value="" placeholder="1st" />
</div>
<div class="col s3 m3 "><label for="title">Year</label>
<select id="year" name="year[]">
<option value="2019" selected>2019</option>
<option value="2018">2018</option>
<option value="2017">2017</option>
<option value="2016">2016</option>
<option value="2015">2015</option>
</select>
</div>
<div class="col s3 m3"><button type="button" name="addmoreEdu" id="addmoreEdu" class="btn btn-success pull-right" >Add More</button></div>
</div>
</div>
</div>
<script src="//code.jquery.com/jquery-3.3.1.min.js"></script>
Теперь это работает отлично, как я ожидал ... Я немного изменил свои дивы, затем покажу полоса зебры на divs