String comparison functions in PHP - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to compare two strings for equality.

PHP

<?php
$string1 = "apple";
$string2 = "apple";
if ($string1 [1] $string2) {
    echo "Strings are equal.";
} else {
    echo "Strings are not equal.";
}
?>

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

A==

B===

C!=

D<>

Attempts:

3 left

💡 Hint

Common Mistakes

Using != which checks for inequality.

Using === which also checks type, not just value.

The operator == checks if two strings have the same value.

2fill in blank

medium

Complete the code to compare two strings ignoring case.

PHP

<?php
$string1 = "Hello";
$string2 = "hello";
if ([1]($string1, $string2) === 0) {
    echo "Strings are equal ignoring case.";
} else {
    echo "Strings are different.";
}
?>

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Astrcmp

Bstrcasecmp

Cstrnatcmp

Dstrncmp

Attempts:

3 left

💡 Hint

Common Mistakes

Using strcmp which is case-sensitive.

Using strncmp which compares only part of the strings.

The function strcasecmp compares two strings ignoring case differences.

3fill in blank

hard

Fix the error in the code to correctly compare the first 3 characters of two strings.

PHP

<?php
$string1 = "abcdef";
$string2 = "abcxyz";
if (strncmp($string1, $string2, [1]) === 0) {
    echo "First 3 characters are equal.";
} else {
    echo "First 3 characters are different.";
}
?>

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A2

B4

C3

D5

Attempts:

3 left

💡 Hint

Common Mistakes

Using 2 or 4 which compares wrong number of characters.

Confusing the argument with string length.

The third argument of strncmp is the number of characters to compare. To compare first 3 characters, use 3.

4fill in blank

hard

Fill both blanks to create an associative array with words as keys and their lengths as values, only for words longer than 4 characters.

PHP

<?php
$words = ["apple", "cat", "banana", "dog"];
$lengths = [
    [1] => strlen([2]) 
    for [1] in $words 
    if strlen([1]) > 4
];
?>

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A$word

B$words

Cword

Dstrlen

Attempts:

3 left

💡 Hint

Common Mistakes

Using $words which is the whole array, not a single word.

Using word without $ which is invalid in PHP.

Use $word as the variable name for each word in the array. It is used as key and inside strlen to get length.

5fill in blank

hard

Fill all three blanks to create an associative array with uppercase words as keys and their lengths as values, only for words longer than 3 characters.

PHP

<?php
$words = ["pear", "fig", "grape", "kiwi"];
$result = [
    [1] => [2] 
    for [3] in $words 
    if strlen([3]) > 3
];
?>

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Astrtoupper($word)

Bstrlen($word)

C$word

D$fruit

Attempts:

3 left

💡 Hint

Common Mistakes

Using different variable names inconsistently.

Not using strtoupper for the key.

Use $word as the variable name. The key is the uppercase word using strtoupper($word). The value is the length using strlen($word).