[WorM32]

#script.php
if ($_POST['param1'] == 1) {
  echo "yes";
} else {
  echo "no";
}

#script.js
$.ajax({
  type: 'POST',
  url: 'script.php',
  data: {param1: 1},
  success: function (data) {
    console.log(data) 
  }
});

#script2.js
$.ajax({
  type: 'POST',
  url: 'script.php',
  success: function (data) {
    console.log(data) 
  }
});