Notice: Undefined index: fix with isset [closed]

Question

You have some problems with the way you are doing it.

The following line reads your settings in…

$settings = get_option( 'eddreldlc_options', $eddreldlc_options );

So settings looks like:

array(
    'loop_true' => array(
        'value' => 'true',
        'label' => 'True'
    ),
    'loop_false' => array(
        'value' => 'false',
        'label' => 'False'
    )
);

Your loop looks like the following

foreach( $eddreldlc_auto_play as $layout )

So what you are actually getting is the following for each $layout variable

$layout = array( 
    'value' => 'true',
    'label' => 'True'
);

Yet you are referencing the following for checked:

$settings['eddreldlc_auto_play']

This does not compute as there is no such index in your $settings variable.

Judging by your code, you probably mean the following there

checked( $layout['value'], 'true' );

Of course, you have some other problems in that code. I’d rewrite it as follows:

<?php
    $settings = get_option( 'eddreldlc_options', $eddreldlc_options );
    foreach( $eddreldlc_auto_play as $layout ) {
        $value = esc_attr( $layout['value'] );
        $checked = checked( $layout['value'], 'true', false );
        echo <<<HTML
<input type="radio" id="eddreldlc_layout_{$layout['value']}" name="eddreldlc_autoplay" value="{$value}" {$checked} />
<label for="eddreldlc_layout_{$layout['value']}">{$layout['label']}</label><br />
HTML;

    }

Your id is very prone to being stomped on so I made it more unique
Your name on the radio makes it look like you are setting the option in your site to stomp on the array you claim to be reading so I changed the name to avoid confusion on what is being expected.
I personally prefer heredoc notation as it makes for much easier reading

Anywise, fix the referenced index and you should be good to go.