Output of PHP programs | Set 3

Predict the output of below PHP programs:

Question 1

<?php
    $number = array(0, 1, one, two, three, 5);
    $num = preg_grep("/[0-5]/", $number);
    print_r($num);
?>

Options:

1. Array([0]=>0 [1]=>1 [2]=>one [3]=>two [4]=>three [5]=>5)
2. Array([2]=>one [3]=>two [4]=>three)
3. Array([1]=> 1)
4. Array([0]=>0 [1]=>1 [5]=>5)

Output:

Array([0]=>0 [1]=>1 [5]=>5)

Explanation: The preg_grep() function is used to search an array for specific patterns and then return a new array based on that filtering.

Question 2

<?php
    $number = array(0, 1, one, two, three, 5);
    $num = preg_grep("/[0-5]/", $number, PREG_GREP_INVERT);
    print_r($num);
?>

Options:

1. Array([0]=>0 [1]=>1 [2]=>one [3]=>two [4]=>three [5]=>5)
2. Array([2]=>one [3]=>two [4]=>three)
3. Array([1]=> 1)
4. Array([0]=>0 [1]=>1 [5]=>5)

Output:

Array([2]=>one [3]=>two [4]=>three)

Explanation: When we include PREG_GREP_INVERT, this will invert our data, so instead of outputting numbers it will output our non-numeric values.

Question 3

<?php
    $name = "I am intern at GeeksforGeeks.";
    if (preg_match("/at/",$name))
    echo "My name is Sagar Shukla";
    else
    echo "My name is not Sagar Shukla";
?>

Options:

1. My name is Sagar Shukla
2. My name is not Sagar Shukla
3. Error
4. No Output

Output:

My name is Sagar Shukla

Explanation: The code uses preg_match() to check for a keyword and replies based on whether it is true (1) or false (0).

Question 4

<?php
    $name = "I am intern at GeeksforGeeks.";
    if (preg_match("/was/",$name))
    echo "My name is Sagar Shukla";
    else
    echo "My name is not Sagar Shukla";
?>

Options:

1. My name is Sagar Shukla
2. My name is not Sagar Shukla
3. Error
4. No Output

Output:

My name is not Sagar Shukla

Explanation: The code uses preg_match to check for a keyword and replies based on whether it is true (1) or false (0).

Question 5

<?php
    $str = "I am intern at GeeksforGeeks";
    $find = array('/am/');
    $replace = array('was');
    echo preg_replace ($find, $replace, $str);
?>

Options:

1. I am intern at GeeksforGeeks
2. I was intern at GeeksforGeeks
3. Error
5. No Output

Output:

I was intern at GeeksforGeeks

Explanation: In the above program, am replaced with was as preg PHP function is used to do a find and replace on a string or an array.

Question 6

<?php
    $str = "I am intern at GeeksforGeeks";
    $find = array('/geeksforgeeks/');
    $replace = array('GEEKSFORGEEKS');
    echo preg_replace ($find, $replace, $str);
?>

Options:

1. I am intern at GeeksforGeeks
2. I am intern at GEEKSFORGEEKS
3. Error
4. No Output

Output:

I am intern at GeeksforGeeks

Explanation: GeeksforGeeks was not replaced because the preg_replace function is case sensitive. Therefore it treats GeeksforGeeks and geeksforgeeks differently.

Question 7

<?php
    $line = "Hello. Welcome to GeeksforGeeks!";
    $sen = preg_split('/\./', $line);
    print_r($sen);
?>

Options:

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

Output:

Array([0]=> Hello [1]=> Welcome to GeeksforGeeks! )

Explanation: We use a ‘.’ period to split the data, therefore giving each sentence it’s own array entry.