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Equivalent of PHP’s in_array() function

Last updated on by Gabriel Livan

Hello coders,

This is a JavaScript function that works like in_array() in PHP. Below is the function with a usage example:

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
 <HEAD>
  <TITLE>Equivalent of PHP in_array() | JavaScript Library</TITLE>
  <META NAME="Author" CONTENT="Bit Repository">

  <META NAME="Keywords" CONTENT="in_array, php, javascript">
  <META NAME="Description" CONTENT="Equivalent of PHP in_array() | JavaScript Library">

<SCRIPT LANGUAGE="JavaScript">

function in_array(string, array)
{
   for (i = 0; i < array.length; i++)
   {
      if(array[i] == string)
      {
         return true;
      }
   }
return false;
}

var extensions = new Array("jpg","jpeg","gif","png","bmp");

/*
// Alternative way of creating the array

var extensions = new Array();

extensions[1] = "jpg";
extensions[0] = "jpeg";
extensions[2] = "gif";
extensions[3] = "png";
extensions[4] = "bmp";
*/

var str_to_check = "bmp";

if(in_array(str_to_check, extensions))
{
  alert(str_to_check +" is in our array.");
}
else
{
  alert(str_to_check +" is not in our array.");
}


</SCRIPT>

</HEAD>
<BODY>
</BODY>
</HTML>

If you have any comments or suggestions regarding this script please post them.