ucfirst

(PHP 4, PHP 5, PHP 7)

ucfirst — 将字符串的首字母转换为大写

说明

ucfirst ( string $str ) : string

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

User Contributed Notes

divinity76 at gmail dot com 18-Nov-2019 12:59
here is how mb_ucfirst should be implemented in userland

<?php

function mb_ucfirst(string $str, string $encoding = null): string
{
    if ($encoding === null) {
        $encoding = mb_internal_encoding();
    }
    return mb_strtoupper(mb_substr($str, 0, 1, $encoding), $encoding) . mb_substr($str, 1, null, $encoding);
}
?>

(when i wrote this comment, everybody else's attempt got it wrong for one reason or another, for example: some don't allow you to specify encoding, and some defaulted to utf-8 instead of defaulting to mb_internal_encoding() )
Anonymous 23-Aug-2017 12:48
Format the input string:

<?php

function ucsentences($string){
    $parts = preg_split('/([^\.\!\?;]+[\.\!\?;"]+)/', strtolower($string), (-1), PREG_SPLIT_DELIM_CAPTURE|PREG_SPLIT_NO_EMPTY);
    $r = '';
    foreach($parts as $key=>$sentence){
        $r .= ucfirst(trim($sentence)) . ' ';
    }
    $r = preg_replace('/\bi\b/', 'I', $r);
    $r = preg_replace_callback('/("[a-z])/', function($m){ return strtoupper($m[0]);}, $r);
    return rtrim($r);
}

$str = 'i\'m not sure. if this is good enough, but i thought: "hey, who know\'s. maybe i am right."';

?>
Outputs:
I'm not sure. If this is good enough, but I thought: "Hey, who know's. Maybe I am right."
nospam at nospam dot com 22-Feb-2017 07:46
Improved method of capitalizing first characters of sentences.
The first two manipulations (double spaces & all caps) are optional so can be removed without harm.

<?php
// return string with first letters of sentences capitalized
function ucsentence($str) {
  if ($str) { // input
    $str = preg_replace('/'.chr(32).chr(32).'+/', chr(32), $str); // recursively replaces all double spaces with a space
    if (($x = substr($str, 0, 10)) && ($x == strtoupper($x))) $str = strtolower($str); // sample of first 10 chars is ALLCAPS so convert $str to lowercase; if always done then any proper capitals would be lost
    $na = array('. ', '! ', '? '); // punctuation needles
    foreach ($na as $n) { // each punctuation needle
      if (strpos($str, $n) !== false) { // punctuation needle found
        $sa = explode($n, $str); // split
        foreach ($sa as $s) $ca[] = ucfirst($s); // capitalize
        $str = implode($n, $ca); // replace $str with rebuilt version
        unset($ca); //  clear for next loop
      }
    }
    return ucfirst(trim($str)); // capitalize first letter in case no punctuation needles found
  }
}
?>

"heLLo EarthLing!" >> "HeLLo EarthLing!"
"I'M MOSTLY. caps!  " >> "I'm mostly. Caps!"
"ALLCAPS" >> "Allcaps"
"i haVe neST.ed punct,u.ation!  sp    A  c es.  and CAPs..  " >> "I haVe neST.ed punct,u.ation! Sp A c es. And CAPs.."
kiprasbal at gmail dot com 16-May-2014 06:34
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);
    }
mingalevme at gmail dot com 05-Dec-2013 10:32
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;
}

?>
Nethor 05-Oct-2012 04:14
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];
    }
?>
idont at remember dot it 18-May-2012 11:21
In case you need a French version of ucfirst:

"été indien" => "Eté 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...
qeremy [atta] gmail [dotta] com 27-Feb-2012 04:41
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];
}

$str = "iyilik güzelL?K";
echo ucfirst($str) ."\n";   // Iyilik güzelL?K
echo ucfirst_turkish($str); // ?yilik güzelL?K
?>
vlknmtn at gmail dot com 17-Aug-2011 04:31
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);

?>
Quicker 10-May-2011 01:53
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.
pete at namecube dot net 11-Apr-2010 07:08
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);
}
?>
wilfried dot loche at fr dot adp dot com 22-Jan-2010 02:22
If someone looks for the equivalent on Oracle DB, here it is: INITCAP. Hope this helps!
octavius 26-Sep-2009 05:18
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);
}
?>
bgschool 30-Jul-2009 04:39
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;
    }
?>
svetoslavm at gmail dot com 20-Nov-2008 07:40
For some reason this worked for me.

Mac OS 10.5.1
PHP 5.2.6

<?php
   /**
     * ucfirst UTF-8 aware function
     *
     * @param string $string
     * @return string
     * @see http://ca.php.net/ucfirst
     */
    function my_ucfirst($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
mattalexxpub at gmail dot com 09-Nov-2008 05:10
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?"
?>
prokur.net - there is my email 29-Jun-2008 03:01
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
charliefortune 20-Feb-2008 03:48
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);
    }

?>
webmaster at onmyway dot cz 11-Feb-2008 03:31
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);
}
?>
Uwe 26-Jul-2007 08:08
@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.
adefoor at gmail dot com 12-Jul-2007 11:57
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.

?>
Ken Kehler 14-Mar-2007 12:03
@ 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.

?>
Carel at divers information with dotcom 06-Jan-2007 02:55
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;
}
26-Oct-2006 07:45
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);
}
Michael 12-Sep-2006 06:01
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] = '&nbsp;&nbsp;' . $string[$i];
        }
    }
    $string = implode ('.', $string);
    return $string;
}
Markus Ernst 31-Mar-2006 12:34
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],
            "abcdefghyijklmnopqrstuvwxyz".
            "\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",
            "ABCDEFGHYIJKLMNOPQRSTUVWXYZ".
            "\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);
    }
}
?>
Bartuc 26-Feb-2006 05:28
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;
}

?>
Markus Ernst 12-Jan-2006 06:39
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);
}
?>
plemieux 29-Sep-2005 11:05
Simple multi-bytes ucfirst():

<?php
function my_mb_ucfirst($str) {
    $fc = mb_strtoupper(mb_substr($str, 0, 1));
    return $fc.mb_substr($str, 1);
}
?>
info [at] spwdesign [dot] com 23-Jun-2005 12:48
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;
}
?>
12-Mar-2005 05:11
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.
steven at tux dot appstate dot edu 21-Jun-2004 12:14
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"
Ami Hughes (ami at mistress dot name) 07-Apr-2004 08:34
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);
          
       }
   }

?>
bkimble at ebaseweb dot com 08-Jun-2003 05:02
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); 
}