Output of PHP programs | Set 1 (Regular Expressions)

Predict the output of following PHP programs:

Question 1

<?php
    echo str_pad("Welcome", 5)." to GeeksforGeeks.";
?>

Options:

1. WelcomeWelcomeWelcomeWelcomeWelcome to GeeksforGeeks.
2. to GeeksforGeeks. WelcomeWelcomeWelcomeWelcomeWelcome
3. to GeeksforGeeks. Welcome
4. Welcome to GeeksforGeeks.

Output:

Welcome to GeeksforGeeks.

Explanation: The str_pad() function pads a string with a specified number of characters.

Question 2

<?php
    $author = "GeeksforGeeks";
    $author = str_replace("e","i",$author);
    echo "I am intern at $author.";
?>

Options:

1. I am intern at GeeksforGeeks.
2. I am intirn at GiiksforGiiks.
3. I am intern at GiiksforGiiks.
4. Error

Output:

I am intern at GiiksforGiiks.

Explanation: The str_replace() function case sensitively replaces all instances of a string with another.

Question 3

<?php
    $GfG = "GeeksforGeeks";
    echo ltrim(strstr($GfG, "f"),"f");
?>

Options:

1. GeeksforGeeks
2. Geeks
3. Geeksf
4. orGeeks

Output:

orGeeks

Explanation: The strstr() function returns the remainder of a string beginning with the first occurrence of a predefined string.

Question 4

<?php
    $username = "sagarshUkla785";
    if (ereg("([^a-z])",$username))
        echo "Not a valid username!";
    else
        echo "Valid username!";
?>

Options:

1. Error
2. Not a valid username!
3. Valid username!
4. No Output is returned

Output:

Not a valid username!

Explanation: Because the provided username is not all lowercase, ereg() will not return FALSE (instead returning the length of the matched string, which PHP will treat as TRUE), causing the message to output.

Question 5

<?php
    $GfG = "Hello\tWelcome to\nGeeksforGeeks.";
    print_r(split("[\n\t]",$GfG));
?>

Options:

1. Hello Welcome to GeeksforGeeks.
2. Array ( [0] => Welcome to [1] => GeeksforGeeks. )
3. Array ( [0] => Hello [1] => Welcome to [2] => GeeksforGeeks. )
4. [0] => Hello [1] => Welcome to [2] => GeeksforGeeks.

Output:

[0] => Hello [1] => Welcome to [2] => GeeksforGeeks.

Explanation: The split() function divides a string into various elements, with the boundaries of each element based on the occurrence of a defined pattern within the string.

Question 6

<?php
    $languages = array("C++", "JAVA", "PYTHON", "SCALA");
    $language = preg_grep("/^S/", $languages);
    print_r($language);
?>

Options:

1. Array ( [0] => C++ [1] => JAVA [2] => PYTHON [3] => SCALA )
2. Array ( [3] => SCALA )
3. Array ( [1] => JAVA )
4. Array ( [0] => C++ )

Output:

Array ( [3] => SCALA )

Explanation: This function is used to search an array for languages beginning with S.

Question 7

<?php
    $title = "i'm intern at geeksforGeeks.";
    echo ucwords($title);
?>

Options:

1. I’m Intern At GeeksforGeeks
2. I’m intern at geeksforGeeks
3. i’m Intern At GeeksforGeeks
4. i’m intern at geeksforGeeks

Output:

I'm Intern At GeeksforGeeks.

Explanation: The ucwords() function capitalizes the first letter of each word in a string. Its prototype follows: string ucwords(string str).