PHP string case-insensitive Conversion Function

1. Convert string to lowercase

Strtolower ():This function converts all characters of the input string parameter to lowercase, and puts it back in a small form.
Example:

<? PHP

$ STR = "I want to fly ";

$ STR = strtolower ($ Str );

Echo $ STR;

?>


Output result:

I want to fly

2. convert characters to uppercase

strtoupper () , returns the string in uppercase. the usage is the same as that of strtolowe.

3. convert the first character of a string to uppercase

usfilst () : This function is used to change the first character of a string to uppercase. This function returns a string with the first character in uppercase. the usage is the same as that of strtolowe.

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

ucwords () : This function converts the first character of each word in the input string to uppercase. for example, "Hello world". After this function is processed, "Hello word" is returned ". the usage is the same as that of strtolowe.