Uppercasing first letters of words using preg_replace - php

Question

I need to turn names that are always in lower case into uppercase.
e.g. john johnsson -> John Johnsson
but also:
jonny-bart johnsson -> Jonny-Bart Johnsson
How do I accomplish this using PHP?

Answer 1

You could also use a regular expression:
preg_replace_callback('/\b\p{Ll}/', 'callback', $str)
\b represents a word boundary and \p{Ll} describes any lowercase letter in Unicode. preg_replace_callback will call a function called callback for each match and replace the match with its return value:
function callback($match) {
return mb_strtoupper($match[0]);
}
Here mb_strtoupper is used to turn the matched lowercase letter to uppercase.

Answer 2

If you're expecting unicode characters...or even if you're not, I recommend using mb_convert_case nonetheless. You shouldn't need to use preg_replace when there's a php function for this.

Answer 3

<?php
//FUNCTION
function ucname($string) {
$string =ucwords(strtolower($string));
foreach (array('-', '\'') as $delimiter) {
if (strpos($string, $delimiter)!==false) {
$string =implode($delimiter, array_map('ucfirst', explode($delimiter, $string)));
}
}
return $string;
}
?>
<?php
//TEST
$names =array(
'JEAN-LUC PICARD',
'MILES O\'BRIEN',
'WILLIAM RIKER',
'geordi la forge',
'bEvErly CRuSHeR'
);
foreach ($names as $name) { print ucname("{$name}\n"); }
//PRINTS:
/*
Jean-Luc Picard
Miles O'Brien
William Riker
Geordi La Forge
Beverly Crusher
*/
?>
From comments on the PHP manual entry for ucwords.

Answer 4

with regexps:
$out = preg_replace_callback("/[a-z]+/i",'ucfirst_match',$in);
function ucfirst_match($match)
{
return ucfirst(strtolower($match[0]));
}

Answer 5

Here's what I came up with (tested)...
$chars="'";//characters other than space and dash
//after which letters should be capitalized
function callback($matches){
return $matches[1].strtoupper($matches[2]);
}
$name="john doe";
$name=preg_replace_callback('/(^|[ \-'.$chars.'])([a-z])/',"callback",$name);
Or if you have php 5.3+ this is probably better (untested):
function capitalizeName($name,$chars="'"){
return preg_replace_callback('/(^|[ \-'.$chars.'])([a-z])/',
function($matches){
return $matches[1].strtoupper($matches[2]);
},$name);
}
My solution is a bit more verbose than some of the others posted, but I believe it offers the best flexibility (you can modify the $chars string to change which characters can separate names).