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PHP String Concatenation

Joining one or more string value with other string value or variable is called string concatenation. It is a common task when we want to print any output in a more meaningful way for the user. There are several ways to join strings in PHP. Different types of string concatenation in PHP are shown in this tutorial by using multiple examples.

Example-1: Concatenation using dot (.) operator

String concatenation is normally done by using dot (.) operator in PHP. In the following example, two string variables are declared and dot (.) operator is used to combine these strings with other string and print.

<?php
$string1 = "Charles Babbage";
$string2 = "Computer";
//Join string variables with a string value by using dot (.)
echo $string1." is considered as a father of ". $string2;
?>

Output:

Example-2: Concatenation using echo and comma (,) 

You can easily combine and print string data without using dot (.) operator in PHP by using echo function. Three string variables are declared in the following example. Here, “,” is used to join string value with the variables in echo function. Each variable and string value are separated by comma (,) to combine. This type of joining can be done by using echo function only.

<?php
$name = "John";
$education = "MBA";
$profession = "Business man";
// Combine data using comma (,)
echo "$name"," is an ","$education. <br/>";
echo "He is a ","$profession.";
?>

Output:

Example-3: Concatenation using printf() function

You can use printf() function also for concatenating string values in PHP.  There are many type specifiers are available in PHP to generate formatted output. Two string variables, $site and $type are declared in the following example. Printf() function uses ‘%s’ as type specifier to read string data. Two string variables are added at the beginning and end of the string by adding two ‘%s’ in the first argument and two string variables as other two arguments.

<?php
$site = "linuxhint.com";
$type = "blog site";
printf("%s is a very helpful %s",$site,$type);
?>

Output:

Example-4: Concatenation using shorthand operator (.=)

Dot (.) can be used as shorthand operator for concatenating string data. In the following example, $n variable is initialized by 0 and the current value of $n is combined with new value using for loop and “.=” operator. Finally print the value of $n.

<?php
$n = 0;
for($i=1; $i<10; $i++)
{
$n .= " $i" ;
}
echo $n;
?>

Output:

I hope you will be able to combine string data efficiently in your script if you exercise the above examples properly.

About the author

Fahmida Yesmin

Fahmida Yesmin

I am a trainer of web programming courses. I like to write article or tutorial on various IT topics. I have a YouTube channel where many types of tutorials based on Ubuntu, Windows, Word, Excel, WordPress, Magento, Laravel etc. are published: Tutorials4u Help.