Best way to initialize empty array in PHP- Tutorialpath

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Best way to initialize empty array in PHP

empty array in PHP
empty array in PHP

Description:

The empty () function is used to check whether a variable is empty or not. Often, you may encounter a scenario when you need to code in a fashion if a variable is empty or another if it is not. In these situations, empty work comes to the rescue.

Arrays in PHP: The array() function is used to create an array.

In PHP, there are three types of arrays:

  • Indexed arrays – Arrays with numeric index
  • Associative arrays – Arrays with named keys
  • Multidimensional arrays – Arrays containing one or more arrays

Note: Why is it good to declare an empty array and then push the item into that array?

When declaring an empty array and then later start entering elements into it. With its help various errors can be prevented due to faulty arrays. It helps to have the information of using the Bagged, rather than being an array. This saves time during debugging. Most of the time there may be nothing to add to the array at the point of its creation.

Syntax of Empty Error:-

empty(var_name)

Basic Example:

<?php
       $emptyArray = ( array ) null;
       var_dump( $emptyArray );
?>

Output:

array(0)
  {
    }

How to check whether an array is empty using PHP?

Empty arrays can sometimes cause software crashes or unexpected output. To avoid this, it is better to check whether an array is already empty.

There are various methods and functions available in PHP to check whether a defined or given array is empty.

  1. Using empty() Function: This function determines whether a given variable is empty. If the variable does not exist, this function does not return a warning.

Syntax:

bool empty( $var )

Example:

<?php

// Declare an array and initialize it
$non_empty_array = array(‘URL’ => ‘http://www.tutorialpath.com/’);

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

// Check Condition array is empty or not
if(!empty($non_empty_array))
echo “Array is not empty <br>”;

if(empty($empty_array))
echo “Array is empty”;
?>

Output:

Array is not empty

Array is empty

     2. Using count Function: This function counts all elements in an array. If the number of elements in the array is zero, it will display an empty                array.

Syntax:

int count( $array_or_countable )

Example:

<?php

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

// Function to count array
// element and use condition
if(count($empty_array) == 0)
echo “Array is empty”;
else
echo “Array is non- empty”;
?>

Output:

Array is empty

     3. Using sizeof() function: This method check the size of array. If the size of array is zero then array is empty otherwise array is not empty.

Syntax:

<?php

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

// Use array index to check
// array is empty or not
if( sizeof($empty_array) == 0 )
echo “Empty Array in PHP”;
else
echo “Non-Empty Array in PHP”;
?>

Output:

Empty Array in PHP

Conclusion:

So, hopefully we had shared all the basic steps which help you to empty array in PHPIf you are using any of the above given browser and the steps helps you to enable or disable the JavaScript and PHP then simply share this article with others and also tell us by dropping a comment in the comment section below so that we get to know how helpful this article is for you all.

 

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