Concatenation of two strings in PHP

In this article, we will concatenate two strings in PHP. There are two string operators.

The first is the concatenation operator ('.'), which returns the concatenation of its right and left arguments. The second is the concatenating assignment operator ('.='), which appends the argument on the right side to the argument on the left side. 

Examples:

Input : string1:  Hello
        string2 : World! 
Output : HelloWorld!


Input : string1: geeksfor
        string2: geeks
Output : geeksforgeeks

Example 1: 

<?php 

// First String 
$a = 'Hello'; 

// Second String 
$b = 'World!'; 

// Concatenation Of String 
$c = $a.$b; 

// print Concatenate String 
echo " $c \n"; 
?> 

 HelloWorld! 
 

Time complexity : O(n) 
Auxiliary Space : O(n)

Example 2: 

<?php 

// First String 
$fname = 'John'; 

// Second String 
$lname = 'Carter!'; 

// Concatenation Of String 
$c = $fname." ".$lname; 

// print Concatenate String 
echo " $c \n"; 
?> 

 John Carter! 
 

Time complexity : O(n) 
Auxiliary Space : O(n)

Example 3: 

<?php 

// First String 
$a = 'Hello'; 

// now $a contains "HelloWorld!" 
$a .= " World!"; 

// Print The String $a 
echo " $a \n"; 
?> 

 Hello World! 
 

Time complexity : O(n) 
Auxiliary Space : O(n)

Example 4:

<?php 

// First String 
$a = 'Geeksfor'; 

// Second String
$b = "Geeks"; 

// now $c contains "GeeksforGeeks" 
$c = "$a{$b}";

// Print The String $c 
echo " $c \n"; 
?> 

 GeeksforGeeks 
 

Time complexity : O(n) 
Auxiliary Space : O(n)

PHP is a server-side scripting language designed specifically for web development. You can learn PHP from the ground up by following this PHP Tutorial and PHP Examples.