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Concatenation of two strings in PHP

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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

Code #1: 

PHP

<?php
 
// First String
$a = 'Hello';
 
// Second String
$b = 'World!';
 
// Concatenation Of String
$c = $a.$b;
 
// print Concatenate String
echo " $c \n";
?>

                    

Output
 HelloWorld! 
 

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

  Code #2 : 

PHP

<?php
 
// First String
$fname = 'John';
 
// Second String
$lname = 'Carter!';
 
// Concatenation Of String
$c = $fname." ".$lname;
 
// print Concatenate String
echo " $c \n";
?>

                    

Output
 John Carter! 
 

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

  Code #3 : 

PHP

<?php
 
// First String
$a = 'Hello';
 
// now $a contains "HelloWorld!"
$a .= " World!";
 
// Print The String $a
echo " $a \n";
?>

                    

Output
 Hello World! 
 

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

  Code #4 :

PHP

<?php
 
// First String
$a = 'Geeksfor';
 
// Second String
$b = "Geeks";
 
// now $c contains "GeeksforGeeks"
$c = "$a{$b}";
 
// Print The String $c
echo " $c \n";
?>

                    


Output

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.



Last Updated : 27 Jan, 2023
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