PHP - switch case of every character
136227
Invert case of all letters in a string (uppercase to lowercase and lowercase to uppercase)
148155
PHP function to replace a (i)th-position character
66079
Automatically change é to \'e – most convenient setup for accented letters?
153075
How to do case insensitive string comparison?
136311
Strpos with exact matches
65960
Why the switch statement cannot be applied on strings?
10574
How can I use ranges in a switch case statement using JavaScript?
88909
How do I make this preg_match case insensitive?
15921
Using str_replace so that it only acts on the first match?
23573
Multiple cases in switch statement
106239
Expression inside switch case statement
94488
How to compare strings ignoring the case
92148
SQL Server: Make all UPPER case to Proper Case/Title Case
91847
how to replace special characters with the ones they're based on in PHP?
145746
Remove everything except letters from PHP string
78629
How can I replace a variable in a string with the value in PHP?
32072
PHP: Convert any string to UTF-8 without knowing the original character set, or at least try