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. In order to do this task, we have the following operators 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 :

PHP

<?php
// PHP program to prepend a string


// Function to prepend a string
function prepend_string ($str1, $str2){

    // Using concatenation operator (.)
    $res = $str1 . $str2;

    // Returning the result
    return $res;
    }

// Given string
$str1 = "Geeksforgeeks";
$str2 = "Example";

// Function Call
$str = prepend_string ($str1, $str2);

// Printing the result
echo $str;
?>

Output

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 :

PHP

<?php
// PHP program to prepend a string

// Function to prepend a string
function prepend_string ($str1, $str2) {

    // Using Concatenation assignment
    // operator (.=)
    $str1 .= $str2;

    // Returning the result
    return $str1;
}

// Given string
$str1 = "Geeksforgeeks";
$str2 = "Example";

// Function call
$str = prepend_string ($str1, $str2);

// Printing the result
echo $str;
?>

Output

GeeksforgeeksExample