isset vs empty vs is_null in PHP Example

Today, We want to share with you isset vs empty vs is_null in PHP Example.In this post we will show you wordpress plugin require another plugin, hear for PHP: Test the value of a variable using isset() vs empty() vs is_null() we will give you demo and example for implement.In this post, we will learn about Determine if a variable is set and is not NULL with an example.

isset vs empty vs is_null in PHP Example

There are the Following The simple About PHP isset() vs empty() vs is_null() in PHP Full Information With Example and source code.

As I will cover this Post with live Working example to develop difference between PHP isset() vs empty() vs is_null(), so the php check if string is empty or whitespace is used for this example is following below.

READ :  Multiple Image Upload in php with Database

PHP isset() vs empty() vs is_null()

  “” “tamilrokers” NULL FALSE undefined
empty() TRUE FALSE TRUE TRUE TRUE TRUE
is_null() FALSE FALSE TRUE FALSE FALSE ERROR
isset() TRUE TRUE FALSE TRUE TRUE FALSE

PHP Source Code to Understand the Difference

<?php

print "<hr/>ISSET: <hr/>";
$param = "";
print "isset():". isset($param)."<hr/>";
$param = "tamilrokers";
print "isset('tamilrokers'):". isset($param)."<hr/>";
$param = NULL;
print "isset('NULL'):". isset($param)."<hr/>";
$param = FALSE;
print "isset('FALSE'):". isset($param)."<hr/>";
$param = 0;
print "isset('0'):". isset($param)."<hr/>";
print "isset(undefined):". isset($var3)."<hr/>";

print "<hr/>EMPTY: <hr/>";
$param = "";
print "empty():". empty($param)."<hr/>";
$param = "tamilrokers";
print "empty('tamilrokers'):". empty($param)."<hr/>";
$param = NULL;
print "empty('NULL'):". empty($param)."<hr/>";
$param = FALSE;
print "empty('FALSE'):". empty($param)."<hr/>";
$param = 0;
print "empty('0'):". empty($param)."<hr/>";
print "empty(undefined):". empty($var1)."<hr/>";

print "<hr/>IS_NULL: <hr/>";
$param = "";
print "is_null():". is_null($param)."<hr/>";
$param = "tamilrokers";
print "is_null('tamilrokers'):". is_null($param)."<hr/>";
$param = NULL;
print "is_null('NULL'):". is_null($param)."<hr/>";
$param = FALSE;
print "is_null('FALSE'):". is_null($param)."<hr/>";
$param = 0;
print "is_null('0'):". is_null($param)."<hr/>";
print "is_null(undefined):". is_null($var2)."<hr/>";

?>

E-junkie: Sell digital downloads online

E-junkie Provides a Copy-paste buy-now, and cart buttons for selling downloads, codes and tangible products on any website, blog, social media, email and messenger!

Also see:

  1. The Top 10+ Best Webinar Software Platforms For 2020-2021
  2. Build Your Future Godaddy Careers And Jobs
  3. Introduction To Web Hosting Services

isset() – isset — Determine if a variable is set and is not NULL

<?php

echo isset($param); // false
$param = 'Tamilrokers';

empty() – empty — Determine whether a variable is empty

<?php

$paramStr = '';

echo empty($paramStr); // true

is_null() – is_null — Finds whether a variable is NULL

if (!isset($_REQUEST[$product_status]) || empty($_REQUEST[$product_status])) {
    $file->error = 'Please Enter a Your Product Title';
    return false;
}

Web Programming Tutorials Example with Demo

Read :

READ :  AngularJS Grid CRUD Example - Angular UI Grid

Summary

You can also read about AngularJS, ASP.NET, VueJs, PHP.

I hope you get an idea about php check if field is empty.
I would like to have feedback on my infinityknow.com blog.
Your valuable feedback, question, or comments about this article are always welcome.
If you enjoyed and liked this post, don’t forget to share.