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ucfirst

(PHP 4, PHP 5)

ucfirst — 将字符串的首字母转换为大写

说明

string ucfirst ( string $str )

将 str 的首字符（如果首字符是字母）转换为大写字母，并返回这个字符串。

注意字母的定义取决于当前区域设定。例如，在默认的 “C” 区域，字符 umlaut-a（?）将不会被转换。

参数

str: 输入字符串。

返回值

返回结果字符串。

范例

Example #1 ucfirst() 范例

  <?php
$foo  =  'hello world!' ;
 $foo  =  ucfirst ( $foo );              // Hello world!

 $bar  =  'HELLO WORLD!' ;
 $bar  =  ucfirst ( $bar );              // HELLO WORLD!
 $bar  =  ucfirst ( strtolower ( $bar ));  // Hello world!
 ?>

参见

lcfirst() - 使一个字符串的第一个字符小写
strtolower() - 将字符串转化为小写
strtoupper() - 将字符串转化为大写
ucwords() - 将字符串中每个单词的首字母转换为大写

用户评论:

[#1] kiprasbal at gmail dot com [2014-05-16 06:34:41]

My version, converst first letter of the first word in the string to uppercase

public function mb_ucfirst($str) {
        $aParts = explode(" ",$str);
        $firstWord = mb_convert_case($aParts[0],MB_CASE_TITLE,"UTF-8");
        unset($aParts[0]);

        return $firstWord." ".implode(" ",$aParts);
    }

[#2] const [2013-12-10 08:55:35]

????? ????? ???????? "mb_ucfirst"
<?php header('content-type: text/plain; charset=utf8;'); function mb_ucfirst($str) { if (preg_match('/[a-z]/ui', $str[0])) return ucfirst($str); $first = mb_strtoupper($str[0].$str[1], 'utf8'); $str[0] = $first[0]; $str[1] = $first[1]; return $str; } echo ucfirst('??????? ?? utf8 ucfirst')."\n"; echo mb_ucfirst('??????? ?? utf8 mb_ucfirst')."\n"; echo mb_ucfirst('d??veloppeur mb_ucfirst')."\n"; echo mb_ucfirst('??veloppeur mb_ucfirst')."\n"; ?>
???? ????????:
??????? ?? utf8 ucfirst
???????? ?? utf8 mb_ucfirst
D??veloppeur mb_ucfirst
?veloppeur mb_ucfirst

???????? ???? ?????????? utf8.

[#3] mingalevme at gmail dot com [2013-12-05 10:32:42]

Implementation of multi-bytes ucfirst for "multiword"-strings (module mbstring is required):

<?php public static function ucfirst($str) { $str = mb_strtolower($str); $words = preg_split('/\b/u', $str, -1, PREG_SPLIT_NO_EMPTY); foreach ($words as $word) { $ucword = mb_strtoupper(mb_substr($word, 0, 1)) . mb_substr($word, 1); $str = str_replace($word, $ucword, $str); } return $str; } ?>

[#4] Nethor [2012-10-05 16:14:18]

Simple but workable solution:

<?php mb_internal_encoding("UTF-8"); // before calling the function function utf8_ucfirst($str){ preg_match_all("~^(.)(.*)$~u", $str, $arr); return mb_strtoupper($arr[1][0]).$arr[2][0]; } ?>

[#5] idont at remember dot it [2012-05-18 11:21:02]

In case you need a French version of ucfirst:

"??t?? indien" => "Et?? indien"
"?a va?" => "?a va?"

<?php function frenchUcfirst($v) { $lowCase = "\\xE0\\xE1\\xE2\\xE3\\xE4\\xE5\\xE7\\xE8\\xE9\\xEA\\xEB\\xEC\\xED\\xEE\\xEF"; $lowCase .= "\\xF1\\xF2\\xF3\\xF4\\xF5\\xF6\\xF8\\xF9\\xFA\\xFB\\xFC\\xFD\\xFF\\u0161"; $upperCase = "AAAAAA\\xC7EEEEIIIINOOOOOOUUUUYYS"; return strtoupper(strtr(substr($v, 0, 1), $lowCase, $upperCase)) . substr($v, 1); } ?>

Note:
- Latin non french accented characters follow the same rule:
"?nd?" => "And?"
- Non ASCII characters in the function are in HEX format to avoid encoding issue...

[#6] qeremy [atta] gmail [dotta] com [2012-02-27 16:41:45]

A proper Turkish solution;

<?php function ucfirst_turkish($str) { $tmp = preg_split("//u", $str, 2, PREG_SPLIT_NO_EMPTY); return mb_convert_case( str_replace("i", "?", $tmp[0]), MB_CASE_TITLE, "UTF-8"). $tmp[1]; } $str = "iyilik g??zelL?K"; echo ucfirst($str) ."\n"; // Iyilik g??zelL?K echo ucfirst_turkish($str); // ?yilik g??zelL?K ?>

[#7] vlknmtn at gmail dot com [2011-08-17 16:31:16]

Turkish solution:

<?php mb_internal_encoding("UTF-8"); mb_regex_encoding("UTF-8"); function tr_ilkbuyuk($text) { $text = str_replace("I","?",$text); $text = mb_strtolower($text, 'UTF-8'); if($text[0] == "i") $tr_text = "?".substr($text, 1); else $tr_text = mb_convert_case($text, MB_CASE_TITLE, "UTF-8"); return trim($tr_text); } function tr_ucwords($text) { $p = explode(" ",$text); if(is_array($p)) { $tr_text = ""; foreach($p AS $item) $tr_text .= " ".tr_ilkbuyuk($item); return trim($tr_text); } else return tr_ilkbuyuk($text); } $deger = "?i?ll?lsdg"; echo tr_ucwords($deger); ?>

[#8] Quicker [2011-05-10 13:53:38]

if you want to ucfirst for utf8 try this one:

<?php function ucfirst_utf8($stri){ if($stri{0}>="\xc3") return (($stri{1}>="\xa0")? ($stri{0}.chr(ord($stri{1})-32)): ($stri{0}.$stri{1})).substr($stri,2); else return ucfirst($stri); } ?>

It is quick, not language (but utf8) dependend and does not use any mb-functions such as mb_ucfirst.

[#9] chris at bjelleklang dot org [2011-01-26 03:03:29]

For those who want a multibyte-compliant ucfirst() without wanting to mess with encodings, this should do the trick:

<?php function mb_ucasefirst($str){ $str[0] = mb_strtoupper($str[0]); return $str; } ?>

[#10] pete at namecube dot net [2010-04-11 19:08:00]

for anyone wanting to ucfirst each word in a sentence this works for me:

<?php function ucfirst_sentence($str) { return preg_replace('/\b(\w)/e', 'strtoupper("$1")', $str); } ?>

[#11] wilfried dot loche at fr dot adp dot com [2010-01-22 02:22:29]

If someone looks for the equivalent on Oracle DB, here it is: INITCAP. Hope this helps!

[#12] octavius [2009-09-26 17:18:45]

For lithuanian text with utf-8 encoding I use two functions (thanks [mattalexxpub at gmail dot com] and Svetoslav Marinov)

<?php function my_ucfirst($string, $e ='utf-8') { if (function_exists('mb_strtoupper') && function_exists('mb_substr') && !empty($string)) { $string = mb_strtolower($string, $e); $upper = mb_strtoupper($string, $e); preg_match('#(.)#us', $upper, $matches); $string = $matches[1] . mb_substr($string, 1, mb_strlen($string, $e), $e); } else { $string = ucfirst($string); } return $string; } function sentence_case($string) { $sentences = preg_split('/([.?!]+)/', $string, -1, PREG_SPLIT_NO_EMPTY|PREG_SPLIT_DELIM_CAPTURE); $new_string = ''; foreach ($sentences as $key => $sentence) { $new_string .= ($key & 1) == 0? my_ucfirst(strtolower(trim($sentence))) : $sentence.' '; } return trim($new_string); } ?>

[#13] bgschool [2009-07-30 04:39:08]

Simple function for use ucfirst with utf-8 encoded cyrylic text

<?php public function capitalize_first($str) { $line = iconv("UTF-8", "Windows-1251", $str); // convert to windows-1251 $line = ucfirst($line); $line = iconv("Windows-1251", "UTF-8", $line); // convert back to utf-8 return $line; } ?>

[#14] svetoslavm at gmail dot com [2008-11-20 07:40:29]

For some reason this worked for me.

Mac OS 10.5.1
PHP 5.2.6

<?php function my_ucfirst($string, $e ='utf-8') { if (function_exists('mb_strtoupper') && function_exists('mb_substr') && !empty($string)) { $string = mb_strtolower($string, $e); $upper = mb_strtoupper($string, $e); preg_match('#(.)#us', $upper, $matches); $string = $matches[1] . mb_substr($string, 1, mb_strlen($string, $e), $e); } else { $string = ucfirst($string); } return $string; } ?>

Svetoslav Marinov
http://slavi.biz

[#15] mattalexxpub at gmail dot com [2008-11-09 17:10:45]

This is what I use for converting strings to sentence case:

<?php function sentence_case($string) { $sentences = preg_split('/([.?!]+)/', $string, -1, PREG_SPLIT_NO_EMPTY|PREG_SPLIT_DELIM_CAPTURE); $new_string = ''; foreach ($sentences as $key => $sentence) { $new_string .= ($key & 1) == 0? ucfirst(strtolower(trim($sentence))) : $sentence.' '; } return trim($new_string); } print sentence_case('HMM. WOW! WHAT?'); // Outputs: "Hmm. Wow! What?" ?>

[#16] prokur.net - there is my email [2008-06-29 15:01:13]

I believe that mb_ucfirst will be soon added in PHP, but for now this could be useful
<?php if (!function_exists('mb_ucfirst') && function_exists('mb_substr')) { function mb_ucfirst($string) { $string = mb_strtoupper(mb_substr($string, 0, 1)) . mb_substr($string, 1); return $string; } } ?>

it also check is mb support enabled or not

[#17] charliefortune [2008-02-20 03:48:10]

Here's a function to capitalize segments of a name, and put the rest into lower case. You can pass the characters you want to use as delimiters.

i.e. <?php echo nameize("john o'grady-smith"); ?>

returns John O'Grady-Smith

<?php function nameize($str,$a_char = array("'","-"," ")){ //$str contains the complete raw name string //$a_char is an array containing the characters we use as separators for capitalization. If you don't pass anything, there are three in there as default. $string = strtolower($str); foreach ($a_char as $temp){ $pos = strpos($string,$temp); if ($pos){ //we are in the loop because we found one of the special characters in the array, so lets split it up into chunks and capitalize each one. $mend = ''; $a_split = explode($temp,$string); foreach ($a_split as $temp2){ //capitalize each portion of the string which was separated at a special character $mend .= ucfirst($temp2).$temp; } $string = substr($mend,0,-1); } } return ucfirst($string); } ?>

[#18] webmaster at onmyway dot cz [2008-02-11 03:31:41]

Inspired by the lcfirst function a simple mb_lcfirst to cope with multibyte strings:

<?php function mb_lcfirst($str, $enc = null) { if($enc === null) $enc = mb_internal_encoding(); return mb_strtolower(mb_substr($str, 0, 1, $enc), $enc).mb_substr($str, 1, mb_strlen($str, $enc), $enc); } ?>

[#19] Uwe [2007-07-26 08:08:42]

@adefoor, Ken and Zee

Changing the case can only be done by understanding the text. Take for example "USA", "Sunday", "March", "I am ...", abbreviations like "prob." and so on.

[#20] adefoor at gmail dot com [2007-07-12 11:57:02]

Ken and zee

One thing I would do to make this more unviersally work would be to add strtolower() around your $sentence. Doing this will allow you to convert an all caps text block as well as an all lowercase text block.

<?php function sentence_cap($impexp, $sentence_split) { $textbad=explode($impexp, $sentence_split); $newtext = array(); foreach ($textbad as $sentence) { $sentencegood=ucfirst(strtolower($sentence)); $newtext[] = $sentencegood; } $textgood = implode($impexp, $newtext); return $textgood; } $text = "this is a sentence. this is another sentence! this is the fourth sentence? no, this is the fourth sentence."; $text = sentence_cap(". ",$text); $text = sentence_cap("! ",$text); $text = sentence_cap("? ",$text); echo $text; // This is a sentence. This is another sentence! This is the fourth sentence? No, this is the fourth sentence. ?>

[#21] Ken Kehler [2007-03-14 12:03:04]

@ zee: this should solve your !, ?, and any punctuations you want to add. It can probably be cleaned up a bit.

<?php function sentence_cap($impexp, $sentence_split) { $textbad=explode($impexp, $sentence_split); $newtext = array(); foreach ($textbad as $sentence) { $sentencegood=ucfirst($sentence); $newtext[] = $sentencegood; } $textgood = implode($impexp, $newtext); return $textgood; } $text = "this is a sentence. this is another sentence! this is the fourth sentence? no, this is the fourth sentence."; $text = sentence_cap(". ",$text); $text = sentence_cap("! ",$text); $text = sentence_cap("? ",$text); echo $text; // This is a sentence. This is another sentence! This is the fourth sentence? No, this is the fourth sentence. ?>

[#22] Carel at divers information with dotcom [2007-01-06 02:55:16]

I made a small change. Now it takes care of points in numbers

function ucsentence ($string){
   $string = explode ('.', $string);
   $count = count ($string);
   for ($i = 0; $i < $count; $i++){
       $string[$i]  = ucfirst (trim ($string[$i]));
       if ($i > 0){
           if ((ord($string[$i]{0})<48) || (ord($string[$i]{0})>57)) {
      $string[$i] = ' ' . $string[$i];
   }
       }
   }
   $string = implode ('.', $string);
   return $string;
}

[#23] [2006-10-26 07:45:10]

Some simple function for cyrillic and latin letters both:

function rucfirst($str) {
if(ord(substr($str,0,1))<192) return ucfirst($str);
else
return chr(ord(substr($str,0,1))-32).substr($str,1);
}

[#24] Michael [2006-09-12 06:01:20]

This is what you would expect php to deliver if there was a built-in function named ucsentence.

function ucsentence ($string){
$string = explode ('.', $string);
$count = count ($string);
for ($i = 0; $i < $count; $i++){
$string[$i] = ucfirst (trim ($string[$i]));
if ($i > 0){
$string[$i] = '  ' . $string[$i];
}
}
$string = implode ('.', $string);
return $string;
}

[#25] [2006-07-27 02:31:37]

lcfirst - In case you need to get the original string back after a ucfirst.

    function lcfirst( $str ) {
        $str[0] = strtolower($str[0]);
        return $str;
    }

[#26] Markus Ernst [2006-03-31 00:34:22]

A combination of the below functions to enable ucfirst for multibyte strings in a shared hosting environment (where you can not always count on mbstring to be installed):

<?php function my_mb_ucfirst($str, $e='utf-8') { if (function_exists('mb_strtoupper')) { $fc = mb_strtoupper(mb_substr($str, 0, 1, $e), $e); return $fc.mb_substr($str, 1, mb_strlen($str, $e), $e); } else { $str = utf8_decode($str); $str[0] = strtr($str[0], "abcdefgh?ijklmnopqrstuvwxyz". "\x9C\x9A\xE0\xE1\xE2\xE3". "\xE4\xE5\xE6\xE7\xE8\xE9". "\xEA\xEB\xEC\xED\xEE\xEF". "\xF0\xF1\xF2\xF3\xF4\xF5". "\xF6\xF8\xF9\xFA\xFB\xFC". "\xFE\xFF", "ABCDEFGH?IJKLMNOPQRSTUVWXYZ". "\x8C\x8A\xC0\xC1\xC2\xC3\xC4". "\xC5\xC6\xC7\xC8\xC9\xCA\xCB". "\xCC\xCD\xCE\xCF\xD0\xD1\xD2". "\xD3\xD4\xD5\xD6\xD8\xD9\xDA". "\xDB\xDC\xDE\x9F"); return utf8_encode($str); } } ?>

[#27] Bartuc [2006-02-26 17:28:39]

Here is the fixed function for Turkish alphabet..

<?php function uc_first($str){ $str[0] = strtr($str, "abcdefgh?ijklmnopqrstuvwxyz". "\x9C\x9A\xE0\xE1\xE2\xE3". "\xE4\xE5\xE6\xE7\xE8\xE9". "\xEA\xEB\xEC\xED\xEE\xEF". "\xF0\xF1\xF2\xF3\xF4\xF5". "\xF6\xF8\xF9\xFA\xFB\xFC". "\xFE\xFF", "ABCDEFGHI?JKLMNOPQRSTUVWXYZ". "\x8C\x8A\xC0\xC1\xC2\xC3\xC4". "\xC5\xC6\xC7\xC8\xC9\xCA\xCB". "\xCC\xCD\xCE\xCF\xD0\xD1\xD2". "\xD3\xD4\xD5\xD6\xD8\xD9\xDA". "\xDB\xDC\xDE\x9F"); return $str; } ?>

[#28] Markus Ernst [2006-01-12 06:39:13]

plemieux' function did not work for me without passing the encoding to every single mb function (despite ini_set('default_charset', 'utf-8') at the top of the script). This is the example that works in my application (PHP 4.3):

<?php function my_mb_ucfirst($str, $e='utf-8') { $fc = mb_strtoupper(mb_substr($str, 0, 1, $e), $e); return $fc.mb_substr($str, 1, mb_strlen($str, $e), $e); } ?>

[#29] plemieux [2005-09-29 11:05:31]

Simple multi-bytes ucfirst():

<?php function my_mb_ucfirst($str) { $fc = mb_strtoupper(mb_substr($str, 0, 1)); return $fc.mb_substr($str, 1); } ?>

[#30] info [at] spwdesign [dot] com [2005-06-23 00:48:44]

This is a simple code to get all the 'bad words', stored in a database, out of the text. You could use str_ireplace but since that's installed on PHP5 only, this works as well. It strtolowers the text first then places capitals with ucfirst() where it thinks a capital should be placed, at a new sentence. The previous sentence is ended by '. ' then.

<?php function filter($text){ $filters=mysql_query("SELECT word,result FROM filter"); while($filter=mysql_fetch_array($filters)){ $text=str_replace($filter[word],$filter[result],strtolower($text)); $parts=explode(". ",$text); for($i=0;$i<count($parts);$i++){ $parts[$i]=ucfirst($parts[$i]); } $text=implode(". ",$parts); } return $text; } ?>

[#31] [2005-03-12 17:11:27]

Ah, the last code were spoiled, here is the fixed one:

<?php function uc_first($str){ $str[0] = strtr($str, "abcdefghijklmnopqrstuvwxyz". "\x9C\x9A\xE0\xE1\xE2\xE3". "\xE4\xE5\xE6\xE7\xE8\xE9". "\xEA\xEB\xEC\xED\xEE\xEF". "\xF0\xF1\xF2\xF3\xF4\xF5". "\xF6\xF8\xF9\xFA\xFB\xFC". "\xFD\xFE\xFF", "ABCDEFGHIJKLMNOPQRSTUVWXYZ". "\x8C\x8A\xC0\xC1\xC2\xC3\xC4". "\xC5\xC6\xC7\xC8\xC9\xCA\xCB". "\xCC\xCD\xCE\xCF\xD0\xD1\xD2". "\xD3\xD4\xD5\xD6\xD8\xD9\xDA". "\xDB\xDC\xDD\xDE\x9F"); return $str; } ?>

So, this function changes also other letters into uppercase, ucfirst() does only change: a-z to: A-Z.

[#32] Stig-Arne Gr?nroos [2004-12-25 10:46:44]

[#33] steven at tux dot appstate dot edu [2004-06-21 12:14:01]

Note: the return for this function changed in versions 4.3 when a string is passed of length 0. In <4.2 false is returned and in >4.3 a string of length 0 is returned.

Example:

$name = ucfirst("");
var_dump($name);

$name = ucfirst("owen");
var_dump($name);

Results for <4.2:
bool(false) string(4) "Owen"

Results for >4.3:
string(0) "" string(4) "Owen"

[#34] Ami Hughes (ami at mistress dot name) [2004-04-07 20:34:49]

In the event you sort of need multiple delimiters to apply the same action to, you can preg_replace this "second delimiter" enveloping it with your actual delimiter.

A for instance, would be if you wanted to use something like Lee's FormatName function in an input box designed for their full name as this script was only designed to check the last name as if it were the entire string.  The problem is that you still want support for double-barreled names and you still want to be able to support the possibility that if the second part of the double-barreled name starts with "mc", that it will still be formatted correctly.

This example does a preg_replace that surrounds the separator with your actual delimiter.  This is just a really quick alternative to writing some bigger fancier blah-blah function.  If there's a shorter, simpler way to do it, feel free to inform me.  (Emphasis on shorter and simpler because that was the whole point of this.) :D

Here's the example.  I've removed Lee's comments as not to confuse them with my own.

<?php    function FormatName($name=NULL)    {        if (empty($name))            return false;        $name = strtolower($name);        $name = preg_replace("[\-]", " - ",$name); // Surround hyphens with our delimiter so our strncmp is accurate        if (preg_match("/^[a-z]{2,}$/i",$name))  // Simple preg_match if statement        {                        $names_array = explode(' ',$name);  // Set the delimiter as a space.                 for ($i = 0; $i < count($names_array); $i++)            {                if (strncmp($names_array[$i],'mc',2) == 0 || ereg('^[oO]\'[a-zA-Z]',$names_array[$i]))                {                    $names_array[$i][2] = strtoupper($names_array[$i][2]);                }                $names_array[$i] = ucfirst($names_array[$i]);                            }                 $name = implode(' ',$names_array);            $name = preg_replace("[ \- ]", "-",$name); //  Remove the extra instances of our delimiter            return ucwords($name);                    }    } ?>

[#35] bkimble at ebaseweb dot com [2003-06-08 17:02:12]

Here is a handy function that makes the first letter of everything in a sentence upercase. I used it to deal with titles of events posted on my website ... I've added exceptions for uppercase words and lowercase words so roman numeral "IV" doesn't get printed as "iv" and words like "a" and "the" and "of" stay lowercase.

function RemoveShouting($string)
{
$lower_exceptions = array(
        "to" => "1", "a" => "1", "the" => "1", "of" => "1"
);

$higher_exceptions = array(
        "I" => "1", "II" => "1", "III" => "1", "IV" => "1",
        "V" => "1", "VI" => "1", "VII" => "1", "VIII" => "1",
        "XI" => "1", "X" => "1"
);

$words = split(" ", $string);
$newwords = array();

foreach ($words as $word)
{
        if (!$higher_exceptions[$word])
                $word = strtolower($word);
        if (!$lower_exceptions[$word])
                $word = ucfirst($word);
         array_push($newwords, $word);

}

return join(" ", $newwords);
}