How to prepend a string in PHP?

We have given two strings and the task is to prepend a string str1 with another string str2 in PHP. There is no specific function to prepend a string in PHP. To do this task, we have the following operators in PHP:

Below are the methods to prepend a string in PHP

Method 1: Using Concatenation Operator(".")

The Concatenation operator is used to prepend a string str1 with another string str2 by concatenation of str1 and str2.

Syntax:

$x . $y

Example :

GeeksforgeeksExample

Method 2: Using Concatenation assignment operator (".=")

The Concatenation assignment operator is used to prepend a string str1 with another string str2 by appending the str2 to the str1.

Syntax:

$x .= $y

Example :

GeeksforgeeksExample

Method 3: Using sprintf()

The sprintf() function formats a string according to a specified format. By specifying a format that includes both strings in the desired order, you can prepend one string with another.

Example

Hello, world!