Call a PHP Script/Function with JavaScript | Plantpot

Call PHP Script/Function with JavaScript

Web Dev
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In this article, I will introduce how to call PHP script/function with JavaScript.

Call PHP script/function from JavaScript

Use the XMLHttpRequest object to call PHP from JavaScript.
For example, to call PHP that returns a JSON object, write as follows.

var request = new XMLHttpRequest();
request.open('GET', URL, true);
request.responseType = 'json';
request.addEventListener('load', function (response) {
  // Processing after receiving JSON data
});
request.send();

Call JavaScript script/function from PHP

By writing JavaScript in the PHP file, the result on the PHP side can be reflected in JavaScript.

var data = <?="this.response"?>;
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Sample Code

Below is sample code that calls sample1.php from JavaScript in sample2.php using an XMLHttpRequest object.

sample1.php

<?php
$ret = 0;
if(isset($_GET['str'])) {
  $str = $_GET['str'];
  eval(sprintf('$ret=%s;',$str));
}
$array = array("ans1" => $ret, "ans2" => $ret * $ret);
header("Content-Type: text/javascript; charset=utf-8");
echo json_encode($array);
>

sample2.php

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8"/>
  <title>Call PHP Script/Function with JavaScript</title>
</head>
<body>
  <div id="ans1"></div>
  <div id="ans2"></div>
  <script language="javascript" type="text/javascript">
  var request = new XMLHttpRequest();
  request.open('GET', 'http://plantpot.works/sample1.php?str=100', true);
  request.responseType = 'json';
  request.addEventListener('load', function (response) {
    var data = ;
    console.log("ans1", data.ans1);
    document.getElementById("ans1").innerHTML = "ans1=" + data.ans1;
    console.log("ans2", data.ans2);
    document.getElementById("ans2").innerHTML = "ans2=" + data.ans2;
  });
  request.send();
  </script>
</body>
</html>

You can check the execution result on the console.