Why to check both isset() and !empty() function in PHP ?- Tutorialpath

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Why to check both isset() and !empty() function in PHP ?

Php provides some magical predefined functions to handle variables in real-time applications. In this article we will study about the isset() and !empty() functions and implement both these functions with some examples.

isset():

The isset() function is an inbuilt function in PHP. The isset() function is check whether a variable is declared in the application is set or not. This function restores the outcome as true or false.

Syntax:

bool isset( $var, mixed )

Parameters:

This function accepts more than one parameter. The first parameter of this function is $ var. This parameter is used to store the value of a variable.

Example:

<?php

// PHP program to illustrate
// isset() function
$one = ‘0’;

if( isset( $num ) ) {
print_r(” $one is set with isset function <br>”);
}

// Declare an empty array
$array = array();

// Use isset function
echo isset($array[‘geeks’]) ?
‘array is set.’ : ‘the array is not set.’;
?>

Output:

0 is set with isset function 
the array is not set.

empty() Function:

The empty () function decides whether a given variable is empty or NULL. The empty () function is the complement of the empty () function. The empty () function is quite similar! The isset () function is equal to and the !empty () function is equal to the isset () function.

Example:

<?php
   $num1 = 0;
   var_dump(empty($num1)) ;
   var_dump(!empty($num1)) ;
?>

Output:

bool(TRUE)
bool(FALSE)

Description:-

Here var1 =0 ,when we perform empty() function over this,it will evaluate as TRUE because 0 is considered as empty.

Example 1:-

<?php

// PHP program to illustrate
// empty() function

$temp = 0;

// It returns true because
// $temp is empty
if (empty($temp)) {
echo $temp . ‘ it is considered empty’;
}

echo “\n”;

// It returns true since $new exist
$new =1 1;
if (!empty($new)) {
echo $new . ‘ it is considered set’;
}
?>

Output:-

0 it is considered empty
11 it is considered set

Note:

The following values are considered to be empty:

  • 0 (0 as an integer)
  • ” “ (an empty string)
  • 0.0 (0 as a float)
  • “0” (0 as a string)
  • array() (an empty array)
  • NULL
  • FALSE

Conclusion

So, hopefully we have shared all the basic steps that help you php isset() and !empty() functions.  PHP extract the last character from a string. In this tutorial, you have several ways for PHP to remove the last character from any given strings.

 

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