Case conversion functions in PHP - Cheat Sheet & Quick Revision

Recall & Review

beginner

What does the PHP function strtolower() do?

It converts all characters in a string to lowercase letters.

beginner

What is the purpose of the PHP function strtoupper()?

It converts all characters in a string to uppercase letters.

beginner

How does ucfirst() function modify a string in PHP?

It converts the first character of the string to uppercase and leaves the rest unchanged.

beginner

What does the PHP function ucwords() do?

It converts the first character of each word in a string to uppercase.

intermediate

Which PHP function would you use to convert a string to lowercase except the first letter of each word?

Use ucwords(strtolower($string)) to first convert the whole string to lowercase, then capitalize the first letter of each word.

Which PHP function converts all letters in a string to uppercase?

A ucfirst()

B strtolower()

C strtoupper()

D ucwords()

strtoupper() changes all characters in a string to uppercase.

What does the ucfirst() function do in PHP?

A Converts the entire string to uppercase

B Converts the entire string to lowercase

C Converts the first character of each word to uppercase

D Converts the first character of the string to uppercase

ucfirst() only changes the first character of the string to uppercase.

If you want to capitalize the first letter of each word in a string, which function should you use?

A strtoupper()

B ucwords()

C strtolower()

D ucfirst()

ucwords() capitalizes the first letter of each word in the string.

What will strtolower('HELLO World') return?

A 'hello world'

B 'Hello World'

C 'HELLO World'

D 'HELLO world'

strtolower() converts all letters to lowercase.

Which combination of functions converts a string to lowercase and then capitalizes the first letter of each word?

A ucwords(strtolower($string))

B ucfirst(strtolower($string))

C ucwords(strtoupper($string))

D strtoupper(ucwords($string))

First strtolower() makes all letters lowercase, then ucwords() capitalizes the first letter of each word.

Explain how to convert a string to all uppercase and all lowercase in PHP.

Think about functions that change the whole string's letter case.

Describe how to capitalize only the first letter of a string and how to capitalize the first letter of each word in PHP.

One works on the whole string's first letter, the other on each word.