In this tutorial, we are going to learn how to concatenate String, Variable and Arrays in PHP. The concatenate term in PHP refers to joining multiple strings into one string; it also joins variables as well as the arrays.

In PHP, concatenation is done by using the concatenation operator (".") which is a dot. The php developers widely use the concatenation operator, it helps them to join string in their day to the day programming task.

Understand PHP Concatenate Operator

PHP offers two types of string operators to deal with string concatenation.

Operator	Detail
(".")	The dot concatenation operator in PHP concatenate its right and left arguments.
('.=')	This second concatenation operator helps in appending the right side argument to the left side argument.

Concatenate Two Strings in PHP

You can combine two strings in PHP using the concatenate operator, check out the code example below:

<?php
  $string1 = 'John';
  $string2 = 'Doe';
  $name_str = $string1 . ' ' . $string2;
  echo $name_str;
?>

// Result: John Doe

Concatenate Two Variables in PHP

In this php tutorial, we will now learn to concatenate two variables, in the following example we have declared the two variables $var1 and $var2. Then in the $JOIN_VAR variable we are adding the content of both the variables:

<?php
    $var_1 =  "Tony Stark";
    $var_2 = "MCU";
    $JOIN_VAR = $var_1." ".$var_2." ";
    echo $JOIN_VAR;
?>

Output will be:

// Result: Tony Stark MCU 

Concatenating variable with string in PHP

In this example we are Concatenating single variable with string:

<?php
  $var = "Hello";
  echo $var.' World';
?>

// Result: Hello World

Concatenate Two Arrays in PHP

In this example, we will learn how to merge or join two arrays using the PHP array_merge() method. This method will allow us to combine 2 arrays data into one array.

<?php
   $myArr1 = array(1, "tv" => "ac", 2, "washing machine", 3);
   $myArr2 = array("word", "abc", "vegetable" => "tomato", "state" => "washington dc");
 
   // Join arrays
  $output = array_merge($myArr1, $myArr2);
  print_r($output);
?>

Check out the result below:

Array
(
    [0] => 1
    [tv] => ac
    [1] => 2
    [2] => washing machine
    [3] => 3
    [4] => word
    [5] => abc
    [vegetable] => tomato
    [state] => washington dc
)

Finally, we are done with PHP concatenating String, Variable and Arrays tutorials, I have tried to explain almost every possible scenario; however, If i have missed anything you can visit official PHP site to explore more.