Duplicate fields/values from JSON object array in php - php

Question

I am working on a website in which I want to remove duplicate fields from JSON object array.
The JSON object array which I have is:
"rental_rates": [{
"rate_id": 170,
"uuid": "a3a14d20-63d1-11e8-b047-89e5d3a9513d",
"owner_id": 38,
"item_id": 394,
"name": "daily",
"term": "daily",
"currency": "dollars",
"rate": "56.00",
"min_charge": "56.00",
"created_at": "2018-05-30 06:20:43",
"updated_at": "2018-05-30 06:21:07"
}, {
"rate_id": 172,
"uuid": "a3a1c500-63d1-11e8-8740-8925bbb8ada8",
"owner_id": 38,
"item_id": 394,
"name": "weekly",
"term": "weekly",
"currency": "dollars",
"rate": "677.00",
"min_charge": "56.00",
"created_at": "2018-05-30 06:21:00",
"updated_at": "2018-05-30 06:21:07"
}],
The code which I am using in order to pull fields/values form JSON object array is:
foreach ($data['item']->rental_rates as $rental_rate)
{
echo '<span class="rental_term" style="text-align:right">'."minimum".'</span>';
echo '<span class="rental_price" style="text-align:right">$'.floatval($rental_rate->min_charge).'</span><br>';
}
The above code is pulling the following data and I want only one to be shown.
minimum $56
minimum $56
Problem Statement:
I am wondering what changes I need to make in the foreach loop so it pull only one field and value like this,
minimum $56

Answer 1

Two ways. Store what has already been displayed and check for it:
$shown = array();
foreach ($data['item']->rental_rates as $rental_rate)
{
if(!in_array($rental_rate->min_charge, $shown)) {
$shown[] = $rental_rate->min_charge;
echo '<span class="rental_term" style="text-align:right">'."minimum".'</span>';
echo '<span class="rental_price" style="text-align:right">$'.floatval($rental_rate->min_charge).'</span><br>';
}
}
Or create an array indexed by the min_value so there will only ever be one (only works on objects as of PHP >= 7.0.0):
$rates = array_column($data['item']->rental_rates, null, 'min_charge');
foreach $rates as $rental_rate)
{
echo '<span class="rental_term" style="text-align:right">'."minimum".'</span>';
echo '<span class="rental_price" style="text-align:right">$'.floatval($rental_rate->min_charge).'</span><br>';
}
For PHP < 7.0.0, decode the JSON as an array passing true as the second argument and use $data['item']['rental_rates'] and $rental_rate['min_charge'] in the code above instead.