Código PHP:
<?php
include("config/conexion2.php");
if($_POST['articulo'])
{
?>
<?php
$buscar = $_POST["articulo"];
$result = mysqli_query($cn, "SELECT * FROM registro_padres WHERE documento like '%$buscar%' or nombres like '%$buscar%' limit 1");
while ($registro = mysqli_fetch_array($result)){
echo "
<div class='col-sm-12'>
<div class='card'>
<div class='card-header'>
<h5>Static Example</h5>
</div>
<div class='card-block'>
<div class='bd-example bd-example-modal'>
<div class='modal'>
<div class='modal-dialog' role='document'>
<div class='modal-content'>
<div class='modal-header'>
<h5 class='modal-title'>Modal title</h5>
<button type='button' class='close' data-dismiss='modal' aria-label='Close'>
<span aria-hidden='true'>×</span>
</button>
</div>
<div class='modal-body'>
<p>".$registro['nombres']."</p>
</div>
<div class='modal-footer'>
<button type='button' class='btn btn-secondary mobtn' data-dismiss='modal'>Close</button>
<button type='button' class='btn btn-primary mobtn'>Save changes</button>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
";
}
?>
<?php
} // fin if
?>