PHP Letter Case Conversion Function _php Tutorial

In PHP, the letter case conversion function includes: Strtolower,strtoupper,ucfirst,ucwords, and so on, this article is to introduce you to the letter case conversion function use method.

1. Convert a string to lowercase
Strtolower (): This function converts all characters passed in the string argument to lowercase and puts the string back in a small form

The code is as follows	Copy Code
Echo strtolower ("Hello world!"); ?>

2. Turn characters into uppercase
Strtoupper (): This function, in contrast to the Strtolower function, converts all characters of the passed character argument to uppercase and returns the string in uppercase. Usage is the same as Strtolowe ().

The code is as follows	Copy Code
$str = "Mary had A Little Lamb and She loved It so"; $str = Strtoupper ($STR); Echo $str; Print MARY had A LITTLE LAMB and SHE loved IT so ?>

3. Convert the first character of a string to uppercase
Ucfirst (): The function is to change the first character of a string to uppercase, which returns a string with the first character capitalized. Use the same as Strtolowe ().

The code is as follows	Copy Code
$foo = ' Hello world! '; $foo = Ucwords ($foo); Hello world! $bar = ' HELLO world! '; $bar = Ucwords ($bar); HELLO world! $bar = Ucwords (Strtolower ($bar)); Hello world! ?>

4. Convert the first character of each word in a string to uppercase
Ucwords (): This function capitalizes the first character of each word of the passed-in string. Like "Hello World", after the function is processed, "Hello Word" is returned. Usage same as Strtolowe ()

The code is as follows	Copy Code
$foo = ' Hello world! '; $foo = Ucfirst ($foo); Hello world! $bar = ' HELLO world! '; $bar = Ucfirst ($bar); HELLO world! $bar = Ucfirst (Strtolower ($bar)); Hello world! ?>

5. First initial letter lowercase lcfirst ()

The code is as follows	Copy Code
$foo = ' HelloWorld '; $foo = Lcfirst ($foo); HelloWorld $bar = ' HELLO world! '; $bar = Lcfirst ($bar); HELLO world! $bar = Lcfirst (Strtoupper ($bar)); HELLO world! ?>

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