laravel - append index to a variable in blade-CodePudding

I have multiple columns which is saved with a suffix ended with the index of 1-12, such as savings_date_mth_1 until savings_date_mth_12. As of now, I would like to display this value on blade using for loop, but it cannot read the name of the column when I name it such as below.

@for ($i = 1; $i <= $savings->months_diff; $i  )
<div >
    <div >
        {{ $savings->savings_date_mth_.$i }}
        {{ \Carbon\Carbon::parse($savings->savings_date_mth_.$i)->format('M') }} Savings
    </div>
    <div>
        Cost Item: 100
    </div>
</div>
@endfor

I have tried using {$i} as well but it's not showing the value of the column still. Please enlighten me on this particular issue and what is the best practice for this.

CodePudding user response：

You need to use savings_date_mth as a String, and interpolate or concatenate $i to it.

In PHP, you can use a String to access a property of an Object like this:

$string = 'something';
$object = (object)['something' => 'another'];
{{ $object->{$string} }} // 'another'

But in your case, you're constructing the String from a variable as well:

$i = 1;
$j = 2;
$savings = (object)['savings_date_mth_1' => 100, 'savings_date_mth_2' => 200]);
{{ $savings->{"savings_date_mth_{$i}"} }} // 100
{{ $savings->{"savings_date_mth_{$j}"} }} // 200

So in the end, your code would look like:

@for ($i = 1; $i <= $savings->months_diff; $i  )
<div >
    <div >
        {{ $savings->{"savings_date_mth_{$i}"} }}
        {{ \Carbon\Carbon::parse($savings->{"savings_date_mth_{$i}"})->format('M') }} Savings
    </div>
    <div>
        Cost Item: 100
    </div>
</div>
@endfor

Alternatively, via concatenation:

{{ $savings->{'savings_date_mth_' . $i} }}
{{ \Carbon\Carbon::parse($savings->{'savings_date_mth_' . $i})->format('M') }} Savings

Whichever you prefer, or is consistent with other usage in your project, if any.