Adding two or more strings in PHP

Concatenate strings with the dot operator

PHP joins strings with the . operator. Use .= when appending to an existing string variable.

$first = 'Plus2net';
$topic = 'PHP Strings';
$message = $first . ' - ' . $topic;
echo $message;

$string1="Welcome to plus2net.com";
$string2=" PHP  section ";
$string=$string1.$string2;
echo $string;

The output joins the two strings in their original order:

Welcome to plus2net.com PHP section

We can add any number of strings by using " . " ( dot ) in between them.

Now let us learn how we can add different strings to a common string variable. Here is the code.

$string= " Hello, ";
$string .=" Welcome to ";
$string .=" plus2net.com ";
echo $string;

The above code will print all the strings one after other forming the complete sentence.

We can merge one string inside another string like this.

$string2=" PHP  section ";
$string= "Welcome to plus2net.com $string2";
echo $string;

Here the code will display full string with string2 value added at the end. A function call is not evaluated inside an interpolated string. Let us try to add one function to display present date inside the welcome message. The next example intentionally shows that writing date() inside quotation marks outputs literal text rather than calling the function.

$string= "Welcome to plus2net.com $string2 today on date('m/d/y')";

We have to modify the above line like this to display current date.

$string= "Welcome to plus2net.com $string2 today on  ". date("m/d/y");
echo $string;

Output is here

Welcome to plus2net.com PHP section today on 10/12/26

Example: Concatenating Multiple Strings Dynamically

$str1 = "Hello";
$str2 = "World!";
echo $str1 . " " . $str2;  // Output: Hello World!

Example: Concatenating Numeric Strings

$num1 = "100";
$num2 = "50";
echo $num1 . $num2;  // Output: 10050

String Functions More PHP string operations Change all alphabetic chars to lowercase Checking all lower case or upper case chars in a string

Subhendu Mohapatra

Author & Instructor at plus2net

I write and maintain practical tutorials on Python, PHP, SQL, JavaScript, HTML, jQuery, and web development at plus2net. The tutorials focus on clear explanations, working examples, and code that readers can test and adapt while learning.

About the author Watch on YouTube

Connect:

Subscribe to our YouTube Channel here

rajesh	28-06-2010
Good useful article.

String adding in PHP

Concatenate strings with the dot operator

Example: Concatenating Multiple Strings Dynamically

Example: Concatenating Numeric Strings

Subhendu Mohapatra