String replace functions in PHP - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to replace all occurrences of 'apple' with 'orange' in the string.

PHP

<?php
$text = "I like apple pie.";
$newText = str_replace([1], "orange", $text);
echo $newText;
?>

Drag options to blanks, or click blank then click option'

A"pear"

B"banana"

C"apple"

D"grape"

Attempts:

3 left

💡 Hint

Common Mistakes

Using the wrong string to replace.

Not putting the string to find in quotes.

The str_replace function replaces all occurrences of the first string with the second string. Here, we want to replace "apple" with "orange".

2fill in blank

medium

Complete the code to replace the first occurrence of 'cat' with 'dog' in the string.

PHP

<?php
$text = "The cat sat on the cat mat.";
$newText = preg_replace('/[1]/', "dog", $text, 1);
echo $newText;
?>

Drag options to blanks, or click blank then click option'

Adog

Bcat

Attempts:

3 left

💡 Hint

Common Mistakes

Using the replacement string as the pattern.

Forgetting the slashes around the pattern.

The preg_replace function uses a pattern to find matches. Here, the pattern is '/cat/' to find the word 'cat'. The fourth argument '1' limits replacement to the first match.

3fill in blank

hard

Fix the error in the code to replace 'blue' with 'red' in the string.

PHP

<?php
$color = "blue";
$text = "The sky is blue.";
$newText = str_replace([1], "red", $text);
echo $newText;
?>

Drag options to blanks, or click blank then click option'

Ablue

Bcolor

C"color"

D$color

Attempts:

3 left

💡 Hint

Common Mistakes

Forgetting the dollar sign for variables.

Passing the variable name as a string.

The variable $color holds the string 'blue'. To use it in str_replace, we must pass the variable name with the dollar sign.

4fill in blank

hard

Fill both blanks to create a dictionary of words and their replacements, then replace them in the text.

PHP

<?php
$text = "I have a cat and a dog.";
$replacements = array([1] => "dog", [2] => "cat");
$newText = str_replace(array_keys($replacements), array_values($replacements), $text);
echo $newText;
?>

Drag options to blanks, or click blank then click option'

A"cat"

B"dog"

Attempts:

3 left

💡 Hint

Common Mistakes

Swapping keys and values.

Not using quotes around the words.

The array keys are the words to find, and the values are the words to replace them with. Here, "cat" is replaced with "dog" and "dog" is replaced with "cat".

5fill in blank

hard

Fill all three blanks to replace all vowels with '*' in the string using str_replace.

PHP

<?php
$text = "Hello World!";
$vowels = array([1]);
$stars = array([2]);
$newText = str_replace($vowels, $stars, [3]);
echo $newText;
?>

Drag options to blanks, or click blank then click option'

A"a", "e", "i", "o", "u"

B"*", "*", "*", "*", "*"

C$text

D"aeiou"

Attempts:

3 left

💡 Hint

Common Mistakes

Using a string instead of an array for vowels or stars.

Forgetting the dollar sign for variables.

We create an array of vowels to find and an array of stars to replace them. Then we call str_replace with these arrays and the original text.