How to execute a JavaScript Function in PHP?

By Ujwal Kumar Sahoo

In this article, we will discuss how to execute a javascript function in PHP. Before that let us discuss what is exactly a javascript function. Then we will go for call a JavaScript function in PHP.

What is a Javascript function?

The Javascript is the client-side script that can add, delete and modify the contents and designs of an HTML.

A function is a set of instructions that have reusability property and it is called by the function name.

Summing up, the javascript function is used to execute or trigger a function from a javascript code block(i.e written between <script> and </sccript>) by any event in HTML block.

Example:-

<html>
 <body>
   <script>
     function add(n1, n2) 
      {
       return n1 + n2;
      }
     document.write(add(12, 10));
   </script>
 </body>
</html>

Output:-

22

How to trigger or call the javascript function from PHP

PHP considers every HTML element as strings inside the echo command. So, we will trigger the javascript function calls inside the echo command.

Let us illustrate a simple function call from PHP,

<script>
  function display() 
  {
    //display the text
    document.write("Hello Codespeedy.");
  }
</script>

<?php
  //function is called inside echo command
  echo '<script>display();</script>';

?>

Output:-

Hello Codespeedy.

Let us create a javascript function call by a button event i.e. onClick attribute,

<script type="text/JavaScript"> 
    
function show_hide() {
  var x = document.getElementById("parag");
  if (x.style.display === "none") 
  {
    x.style.display = "block";
  } 
  else 
  {
    x.style.display = "none";
  }
}

</script>
<?php 
    //show_hide() function is triggered on button click 
    echo "<button onClick='show_hide()'>Show/Hide</button>";
    //display this paragraph when button is clicked
    echo'<p id="parag" style="display:none;">Welcome to Codespeedy.</p>';
?>

Output:-

execute a JavaScript Function in PHP

In this way, we can execute or call a javascript function in PHP. If you have any doubt, put a comment below,

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