Manipulating text or string data is such a common task that most all programming languages provide built-in functions for this specific purpose. PHP is no different in that regard. The language comes chock-full of different string manipulating functions. If you need string data in all capitalized or upper-cased letters, you can use strtoupper(). What about all lower-case strings? The strtolower() function takes of that. In this post, we visit some rudimentary examples and gain a feel for how these 2 functions operate.
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Below are some example uses of strtoupper() and strtolower(). Experiment with them on your particular string data to know for sure how they behave…
Lower-case, single word
1 | $first_name = 'josh'; |
1 2 3 | echo 'strtoupper(): '.strtoupper($first_name); echo 'strtolower(): '.strtolower($first_name); |
1 2 | strtoupper(): JOSH strtolower(): josh |
All upper-case, single word
1 | $cap_first_name = 'JOSH'; |
1 2 3 | echo 'strtolower(): '.strtolower($cap_first_name); echo 'strtoupper(): '.strtoupper($cap_first_name); |
1 2 | strtolower(): josh strtoupper(): JOSH |
Lower-case, multiple words
1 | $whole_name = 'josh otwell'; |
1 2 3 | echo 'strtoupper(): '.strtoupper($whole_name); echo 'strtolower(): '.strtolower($whole_name); |
1 2 | strtoupper(): JOSH OTWELL strtolower(): josh otwell |
Upper-case, multiple words
1 | $cap_whole_name = 'JOSH OTWELL'; |
1 2 3 | echo 'strtolower(): '.strtolower($cap_whole_name); echo 'strtoupper(): '.strtoupper($cap_whole_name); |
1 2 | strtolower(): josh otwell strtoupper(): JOSH OTWELL |
First letter capitalized, single word
1 | $cap_name = 'Josh'; |
1 2 3 | echo 'strtolower(): '.strtolower($cap_name); echo 'strtoupper(): '.strtoupper($cap_name); |
1 2 | strtolower(): josh strtoupper(): JOSH |
First letter of each word capitalized, multiple word
1 | $cap_each_name = 'Josh Otwell'; |
1 2 3 | echo 'strtolower(): '.strtolower($cap_each_name); echo 'strtoupper(): '.strtoupper($cap_each_name); |
1 2 | strtolower(): josh otwell strtoupper(): JOSH OTWELL |
Visit any of the below PHP-related blog posts I have written if you are so inclined. Please share them with others who would benefit from the content as well.
- PHP date() function for common date formats
- PHP trim functions: trim, rtrim, and ltrim
- PHP empty() function use with MySQL NULL
- Use MySQL BLOB column with PHP to store .pdf file
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Josh Otwell has a passion to study and grow as a SQL Developer and blogger. Other favorite activities find him with his nose buried in a good book, article, or the Linux command line. Among those, he shares a love of tabletop RPG games, reading fantasy novels, and spending time with his wife and two daughters.
Disclaimer: The examples presented in this post are hypothetical ideas of how to achieve similar types of results. They are not the utmost best solution(s). The majority, if not all, of the examples provided, are performed on a personal development/learning workstation-environment and should not be considered production quality or ready. Your particular goals and needs may vary. Use those practices that best benefit your needs and goals. Opinions are my own.