How to Use foreach with 2 array variable in php - php

Question

i have codes like this
<?php
include "assets/config/connect.php";
foreach( $_POST['nim'] as $nim ){
$kode_mk= $_POST['kode_mk'] ;
$nilai= $_POST['nilai'] ;
$tahun_akademik= $_POST['tahun_akademik'] ;
$sql = " INSERT INTO nilai (nim, kode_mk, nilai, tahun_akademik, id_nilai) VALUES ('$nim', '$kode_mk', '$nilai', '$tahun_akademik', NULL) ";
if (!mysql_query($sql)){
die('Error: ' . mysql_error());
}
}
?>
but the result is not same with my expectation
this is the result
please help me

Answer 1

$kode_mk = $_POST['kode_mk'];
$nilai = $_POST['nilai'];
$tahun_akademik = $_POST['tahun_akademik'];
all variables are arrays, not strings as you expect, you should
var_dump($_POST);
to see the entire structure of POST array

Answer 2

The Error
So assuming kode_mk, nilai, tahun_akademik are all arrays in $_POST you are trying to insert the object of an array as a string. First convert the array to a string using a function like implode().
Solution: Using PHP Implode()
$array = array('hi', 'my', 'name', 'is');
$string = implode(',', $array); // string = 'hi,my,name,is'
Implode works like this implode(glue, array) the glue is a string that is inserted between each element of the array to separate them in a string. You can use explode(delimiter, string) to then reverse the string to an array!
Example Using your code
<?php
include "assets/config/connect.php";
foreach( $_POST['nim'] as $nim ){
$kode_mk= implode(', ', $_POST['kode_mk']);
$nilai= implode(', ', $_POST['nilai']);
$tahun_akademik= implode(', ', $_POST['tahun_akademik']);
$sql = " INSERT INTO nilai (nim, kode_mk, nilai, tahun_akademik, id_nilai) VALUES ('$nim', '$kode_mk', '$nilai', '$tahun_akademik', NULL) ";
if (!mysql_query($sql)){
die('Error: ' . mysql_error());
}
}
?>
Notes:
Try Using mysqli not the mysql extension for security reasons mentioned by: #messy
Looks like you are looping over $_POST['nim'], but then pulling the same $_POST values for the columns of the database.
We could really use the format and syntax of the $_POST variable

Answer 3

You have to show us what your input data looks like. You can do that with print_r() or var_dump():
print_r($_POST);
From the looks of it, your form inputs are arrays (checkboxes?) and you need to either pull them together into a single string or use each one separately.
Also, there is no reason to continue to gather your POST values inside the loop if there is no change in their values. Pull them up outside the loop.
Finally, the mysql_ extension is deprecated and highly discouraged - you shouldn't be using it to write new code. You also need to validate and sanitize your data before doing any inserts. Easiest way to do the latter is parameterized queries.