In this article you will learn how to merge two or more arrays into one array in PHP. You can easily do it after use array_merge() function to merge the elements or values of two or more arrays together into a single array.

array_merge() function

The array_merge() function merges one or more arrays into one array. Note: If two or more array elements have the same key, the last one overrides the others.

Merge two or more arrays into one array in PHP

<?php
$array1 = array("yellow", "red", "green", "orange", "purple");
$array2 = array("pink", "brown", "green", "orange", "red");
$array  = array_merge($array1, $array2);
print_r($array);
?>

The above example will output:

Array
(
    [0] => yellow
    [1] => red
    [2] => green
    [3] => orange
    [4] => purple
    [5] => pink
    [6] => brown
    [7] => green
    [8] => orange
    [9] => red
)

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In this tutorial, we will explain you how to merge two arrays without duplicate values in PHP. You can use the PHP array_unique() function and PHP array_merge() function together to merge two arrays into one array without duplicate values in PHP.

Merge two arrays

You can use PHP array_merge function for merging both arrays into one array. it’s giving output like this.

<?php
$array1 = array("yellow", "red", "green", "orange", "purple");
$array2 = array("pink", "brown", "green", "orange", "red");
$array  = array_merge($array1, $array2);
print_r($array);
?>

Array
(
    [0] => yellow
    [1] => red
    [2] => green
    [3] => orange
    [4] => purple
    [5] => pink
    [6] => brown
    [7] => green
    [8] => orange
    [9] => red
)

In above output you can see there are many duplicate entries But we want to remove these duplicate entries before merging both array.

Merge two arrays without duplicate values in PHP

Now we will use array_unique() and array_merge() both PHP function together to merge two arrays and remove duplicate values like in below example:

<?php
$array1 = array("yellow", "red", "green", "orange", "purple");
$array2 = array("pink", "brown", "green", "orange", "red");
$array = array_unique(array_merge($array1, $array2));
print_r($array);
?>

The above example will output:

Array
(
    [0] => yellow
    [1] => red
    [2] => green
    [3] => orange
    [4] => purple
    [5] => pink
    [6] => brown
)

In above output you can see we merged both arrays without duplicate values that’s what we want.

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In this article you will learn how to remove empty array elements and reindex from an array in PHP. You can easily do it after use array_values() and array_filter() function together to remove empty array elements and reindex from an array in PHP.

array_filter() function

The PHP array_filter() function remove empty array elements or values from an array in PHP. This will also remove blank, null, false, 0 (zero) values.

array_values() function

The PHP array_values() function returns an array containing all the values of an array. The returned array will have numeric keys, starting at 0 and increase by 1.

Remove Empty Array Elements and Reindex In PHP

First let’s see the $stack array output :

<?php
$stack = array("PHP", "HTML", "CSS", "", "JavaScript", null, 0);
print_r($stack);
?>

Output:

Array
(
    [0] => PHP
    [1] => HTML
    [2] => CSS
    [3] => 
    [4] => JavaScript
    [5] => 
    [6] => 0
)

In above output we want to remove blank, null, 0 (zero) values and then reindex array elements. Now we will use array_values() and array_filter() function together like in below example:

<?php
$stack = array("PHP", "HTML", "CSS", "", "JavaScript", null, 0);
print_r(array_values(array_filter($stack)));
?>

Output:

Array
(
    [0] => PHP
    [1] => HTML
    [2] => CSS
    [3] => JavaScript
)

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In this article we will explain how to calculate the number of days between two dates in PHP. There are many different way to find the number of days between two dates in PHP.

Calculate the number of days between two dates in PHP

Method 1#

First we will convert start date and end date into to unix timestamps using strtotime() function, then substract end date to start date then it will give you the difference in seconds, which you divide by 86400 (total seconds in a day) to give you an approximate total of days in that range.

<?php
function dateDifference($start_date, $end_date)
{
    // calulating the difference in timestamps 
    $diff = strtotime($start_date) - strtotime($end_date);
     
    // 1 day = 24 hours 
    // 24 * 60 * 60 = 86400 seconds
    return ceil(abs($diff / 86400));
}
 
// start date 
$start_date = "2016-01-02";
 
// end date 
$end_date = "2016-01-21";
 
// call dateDifference() function to find the number of days between two dates
$dateDiff = dateDifference($start_date, $end_date);
 
echo "Difference between two dates: " . $dateDiff . " Days ";
?> 

The above example will output:

Difference between two dates: 19 Days

Three PHP functions are used in the above script to find the number of days between two dates.

The strtotime() function is a built-in function in PHP which is used to convert an English textual date-time description to a UNIX timestamp.
The abs() function returns the absolute (positive) value of a number.
The ceil() function is used to round a number to the nearest greater integer.

Method 2# DateTime::diff()

<?php
$start_date = date_create("2016-01-02");
$end_date   = date_create("2016-01-21");

//difference between two dates
$diff = date_diff($start_date,$end_date);

//find the number of days between two dates
echo "Difference between two dates: ".$diff->format("%a"). " Days ";
?>

The above example will output:

Difference between two dates: 19 Days

Method 3# DateTime::diff()

<?php
$start_date = new DateTime('2016-01-02');
$end_date = new DateTime('2016-01-21');

//difference between two dates
$diff = $start_date->diff($end_date);

//find the number of days between two dates
echo "Difference between two dates: ".$diff->format("%a"). " Days ";
?>

The above example will output:

Difference between two dates: 19 Days

In the above Method 2#, Method 3# used date_diff() function returns the difference between two DateTime objects.

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