Array values not inserting into database separately - php

Question

I'm not sure exactly how to phrase this so I will show an example. I'm gathering input values in javascript and passing to my php page where I am trying to insert those values in a database.
Instead of inserting separate values it is inserting the entire string.
Part of my javascript below:
var form = document.forms[0];
var txtS = form["bulletlabels"];
var len = txtS.length;
var bulletlabels = "";
for(i=0;i<len;i++) {
bulletlabels += '"'+[i]+'_'+(txtS[i].value)+'_label",';
}
when I do an alert(bulletlabels); I get this:
"0_Lot Size_label","1_Rooms_label","2_Bathrooms_label","3_Basement_label",
On my php page I have:
$bulletlabels = array($_POST['bulletlabels']);
$length = count($bulletlabels);
for ($i = 0; $i < $length; $i++) {
mysqli_query($con,"UPDATE bullets SET bullettitle = '".$bulletlabels[$i]."' WHERE bulletrow = ($i+1)");
}
This inserts the below string into the database on ONE Row which is not the desired effect:
"0_Lot Size_label","1_Rooms_label","2_Bathrooms_label","3_Basement_label",
But here is the key to my confusion - if I manually type the string in, it inserts onto individual database rows as desired.
This inserts values individually as desired when typed manually:
$bulletlabels = array("0_Lot Size_label","1_Rooms_label","2_Bathrooms_label","3_Basement_label",);
Does NOT work and inserts the full concatenated string:
$bulletlabels = array($_POST['bulletlabels']);
Hope I explained well enough - arrays elude me.
EDIT:
Fix for the trailing comma:
var delim = "";
for(i=0;i<len;i++) {
bulletlabels += delim+[i]+'_'+(txtS[i].value)+'_label';
delim = ",";
}
Reference link for trailing comma fix:
Can you use a trailing comma in a JSON object?

Answer 1

Try changing the following line:
$bulletlabels = array($_POST['bulletlabels']);
to
$bulletlabels = explode(',', $_POST['bulletlabels']);
Also do not add quotes in your javascript:
bulletlabels += '"'+[i]+'_'+(txtS[i].value)+'_label",';
should be
bulletlabels += [i]+'_'+(txtS[i].value)+'_label,';
Explanation:
Currently, $bulletlabels is an array with one element, and this element is the following string: "0_Lot Size_label","1_Rooms_label","2_Bathrooms_label","3_Basement_label",. However, you want to have an array with several strings. That's why you need to use the explode function to convert it into a proper array.
Note:
Make sure not to include , in the label names, as it will break with this implementation. If you need to be able to use , too, you should use json functions.