isset vs empty vs is_null in PHP Example

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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.

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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/>";

?>

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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

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Summary

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