How to convert all characters to uppercase, except for the last character in PHP-CodePudding

I need to convert all characters to uppercase except for the last character in the following string:

<?php
    $str = "Hello";

    echo $_str = mb_strtoupper(mb_substr($str, 0, strtolower($str))); 
    ?>

CodePudding user response：

Divide the string into the relevant parts, treat them accordingly, and then rejoin.

$str = "Hello";
$parts = mb_str_split($str, mb_strlen($str) - 1);
$out = mb_strtoupper($parts[0]) . mb_strtolower($parts[1]);

var_dump($out);

Output:

string(5) "HELLo"

CodePudding user response：

Here is an example of how you could accomplish this.

$str = "Hello";
 
$last_char = substr($str, -1);
$str = substr_replace($str ,"",-1);

$str = strtoupper($str);
$str = $str . $last_char;

echo $str;

Where substr($str, -1); is grabbing the last character of the string and setting it to $last_char.

Where substr_replace($str ,"",-1)is replacing the last character from the string with "nothing".

Where strtoupper($str); is capitalizing all the characters in the string.

Where $str . $last_char; is re-adding the character to the end of the string using concatenation.

OUTPUT:

string(5) "HELLo"