Question

PHP

Create a variable named txt and assign the value "Hello".
Create one variable named x, and one variable named y, then use the echo statement to output the sum of x and y.
What kind of variable is being declared within a function and can be accessed within a function only?
Get the length of the string "This is a string".
Reverse the string "Random".
Replace the word "World" with the word "Dolly".
Repeat the string a specific number of times.
Find the last character of the string "This is new".
Show the difference between ltrim() and rtrim() with an example.
How to get the position of the character in a string. Use an example.
How to read each character of a string. Use an example.

Answer 1

In PHP, a local variable is declared within a function and accessed only within that function. A variety of string functions such as strlen(), strrev(), and str_replace() are used for string manipulation, while rtrim and ltrim are used for trimming strings and strpos() for finding character positions.

Step-by-step explanation:

To create a variable named txt and assign it the value Hello, you can use the following PHP code:

$txt = "Hello";

Then, you can create two variables, x and y, assign them numerical values, and output the sum using the echo statement:

$x = 5;
$y = 10;
echo $x + $y; // Outputs 15

The kind of variable declared within a function that can only be accessed within that function is known as a local variable.

To get the length of the string "This is a string", the strlen function is used:

echo strlen("This is a string"); // Outputs 16

To reverse the string "Random", you can use the strrev function:

echo strrev("Random"); // Outputs "modnaR"

To replace the word "World" with "Dolly", the str_replace function is useful:

echo str_replace("World", "Dolly", "Hello World"); // Outputs "Hello Dolly"

To repeat a string a specific number of times, the str_repeat function is employed:

echo str_repeat("Hello", 3); // Outputs "HelloHelloHello"

For finding the last character of the string "This is new", you could use array syntax to access the character:

$string = "This is new";
echo $string[strlen($string) - 1]; // Outputs "w"

To show the difference between rtrim() and ltrim(), let's consider trimming a string with extra spaces:

$trimmedString = " Hello World ";
echo ltrim($trimmedString); // Outputs "Hello World "
echo rtrim($trimmedString); // Outputs " Hello World"

To get the position of a character in a string, the strpos function is used:

$myString = "Hello, World!";
echo strpos($myString, 'W'); // Outputs 7

To read each character of a string, you can use a loop:

$string = "Hello";
for($i = 0; $i < strlen($string); $i++) {
echo $string[$i]; // Outputs each character one by one
}