ucwords() Uppercase the first character of each word in a string

ucwords() prototype

string ucwords ( string $str )

This means that ucwords() accepts string and returns a string with the first character of each word capitalized, if that character is alphabetic. We could rewrite the above function definition in an easy to understandable way:

Explanation of ucwords() function definition

Function Part	Description
string	Type of value this function returns, which is a string, in this case returns the first character capitalized of every word in the string.
ucwords	The function name
string	Parameter type, this function accepts only string data type
$str	Parameter name, a variable that holds the data

<?php
    $str = 'i am php string';
    // uppercase first character of every word of string
    $UpperWord = ucwords($str);
    echo $UpperWord;
?>

The above code prints I Am Php String on browser screen.

<?php
    $str = 'I AM PHP STRING';
    // uppercase first character of every word of string
    $UpperWord = ucwords($str);
    echo $UpperWord;
?>

The above code prints I AM PHP STRING on browser screen. Notice the above code? It didn't change the string because its already in uppercase. So you have to lowercase the entire string and then use ucwords function to uppercase first character of every word.
See the code below:

<?php
    $aVariable = 'I AM PHP STRING';
    //lowercase entire string
    $str = strtolower($aVariable);
    
    // uppercase first character of every word of string
    $UpperWord = ucwords($str);
    echo $UpperWord;
?>

The above code prints I Am Php String on browser screen.