<?php
$host= "localhost";
$dbUser= "usuario";
$userPass = "pass";
$dbName = "baseDatos";
$conexion=mysqli_connect($host,$dbUser,$userPass,$dbName);
// Check connection
if (mysqli_connect_errno())
  {
  echo "Failed to connect to MySQL: " . mysqli_connect_error();
  }

// Perform queries
$sql = "SELECT * FROM Personas";
$resultado = mysqli_query($conexion,$sql);
echo mysqli_num_rows($result);

mysqli_close($con);
?>