How to put php echo array into input tag? [duplicate]

I have a problem to put <?php echo $myArray[0] === 'true' ? 'checked' : ''; ?> into <input type="checkbox" id="checkbox_val" name="checkbox_val" value="1" > . Because I need to define checked in the input. Hope someone can guide me on how to solve this problem.

Below is my sample code, but cannot work:

<?php

    $check_value = 'true,false,false,false,true,false,false';
    
    
    $myArray = explode(',', $check_value);

    foreach ($myArray as $k => $va) { 
    }
    
    
    foreach ($result_arr_user as $val_user) {
    $checkbox = '<input type="checkbox" id="checkbox_val" name="checkbox_val" value="1" echo $myArray[0] === 'true' ? 'checked' : ''; >&nbsp;';
    }
?>