PHP array foreach while loop - php

Question

I am trying to create javascript variable from php, this is what i want to get.
<?PHP echo "var color_name=[<?PHP echo $color_name;?>]"; //var color_name=["Green","Pink"];
<?PHP echo "var style_name=[<?PHP echo $style_name;?>]"; //var style_name=["Basic","Classic"];
this is my predefined_attributes table
this is what i have tried,
<?php
$predifined_qry = "SELECT attribute_column_name
FROM predefined_attributes
WHERE category_id=$id";
$predifined_result = mysqli_query($predifined_qry);
$columnNames = Array();
while ($predifined_result_row = mysqli_fetch_assoc($predifined_result)) {
$columnNames[] = $predifined_result_row['attribute_column_name'];
}
now i can get the attribute_column_name in an array using a foreach loop, but i dont know how to get the attribute_column_value array in a variable like this $style_name, $color_name. please help.

Answer 1

First of all, if you only need 1 column, and the resource/data you get is not massive, you could just fetch all and extract the column
You could expose your php variables in js through JSON
<?php
$predifined_result = mysqli_query($predifined_qry);
$predifined_rows = mysqli_fetch_all($predifined_result, MYSQLI_ASSOC);
$columnNames = array_column($predifined_rows, 'attribute_column_name');
?>
<script>
var columnames = JSON.parse("<?= json_encode($columnNames); ?>");
</script>
So now if we add in the other field :
<?php
$predifined_result = mysqli_query($predifined_qry);
$predifined_rows = mysqli_fetch_all($predifined_result, MYSQLI_ASSOC);
$columnNames = array_column($predifined_rows, 'attribute_column_name');
$columnValues = array_column($predifined_rows, 'attribute_column_value');
// array_combines uses the first array as the key and the second as the value
$columns = array_combine($columnNames, $columnValues);
?>
<script>
var columns = JSON.parse("<?= json_encode($columns); ?>");
</script>
Edit
as in the comments, a key can only appear once in a hashtable/array
so we need to generate an array of values per key
<?php
$predifined_qry = "SELECT attribute_column_name, attribute_column_value
FROM predefined_attributes
WHERE category_id=$id";
$predifined_result = mysqli_query($predifined_qry);
$columns = [];
while($row = mysqli_fetch_assoc($predifined_result)) {
if(!array_key_exists($row['attribute_column_name'], $columns)) {
$columns[$row['attribute_column_name']] = [];
}
$columns[$row['attribute_column_name']][] = $row['attribute_column_value'];
}
?>
<script>
var columns = JSON.parse("<?= json_encode($columns); ?>");
</script>

Answer 2

1st : You need to select attribute_column_value column too
SELECT attribute_column_name,attribute_column_value FROM predefined_attributes where category_id=$id
2nd : You need push both column value in two different array like this
while ( $predifined_result_row = mysqli_fetch_assoc($predifined_result) ) {
$color_name[] = $predifined_result_row['attribute_column_name'];
$style_name[] = $predifined_result_row['attribute_column_value'];
}
3rd : simple apply json_enocde and echo like this
<script>
var color_name=<?php echo json_encode($color_name); ?>;
var style_name=<?php echo json_encode($style_name); ?>;
</script>

Answer 3

$columnValues[] = $predifined_result_row['attribute_column_value'];
You can paste this code into your while loop
And dont't forget to get the need field form database:
$predifined_qry="SELECT attribute_column_name,attribute_column_value FROM predefined_attributes where category_id=$id";