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Last updated: Sat, 27 Jan 2007

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# strtolower

(PHP 3, PHP 4, PHP 5)

strtolower -- Преобразует строку в нижний регистр

## Описание

string strtolower ( string str )

Возвращает строку `string`, в которой все буквенные символы переведены в нижний регистр.

Принадлежность того или иного символа к буквенным определяется с учетом текущей локали. Это означает, что, например, в используемой по умолчанию локали "C" locale, символ Ä не будет преобразован.

Пример 1. Пример использования strtolower()

`<?php $str = "Mary Had A Little Lamb and She LOVED It So"; $str = strtolower($str); echo $str; // выводит: mary had a little lamb and she loved it so ?>`

> Замечание: Эта функция безопасна для обработки данных в двоичной форме.

См. также описание функций strtoupper(), ucfirst(), ucwords() и mb_strtolower().

add a note User Contributed Notes
strtolower
Dinçer Akay
20-Dec-2006 02:32
`Turkish Character
<?php
function strtolower_tr($string)
{
$low=array("Ü" => "ü", "Ö" => "ö", "Ğ" => "ğ", "Ş" => "ş", "Ç" => "ç", "İ" => "i", "I" => "ı");
return strtolower(strtr($string,$low));
}
?>`
Enzo_01 at abv dot bg
06-Nov-2006 11:31
`two functions what works with cyrilic text
function cyr_strtolower($a) {
$offset=32;
$m=array();
for($i=192;$i<224;$i++)$m[chr($i)]=chr($i+$offset);
return strtr($a,$m);
}
function cyr_strtoupper($a) {
$offset=32;
$m=array();
for($i=192;$i<224;$i++)$m[chr($i+$offset)]=chr($i);
return strtr($a,$m);
}
ex:
cyr_strtoupper("абвгде"); // АБВГДЕ
cyr_strtolower("АБВГДЕ"); // абвгде`
eduardor2k at redr2k dot com
08-Aug-2006 02:34
`I changed it a bit and i found that it's better to put everything in lowercase, and rebuild the text the same way a teacher corrects a text, for now it only checks that the first letter after a point "." must be
in upper case.
function RemoveShouting($string)
{
$string = strtolower(trim($string));
for($i=0;$i<strlen($string);$i++){
if($i==0){$string[$i] = strtoupper($string[$i]);}
if($string[$i] == "."){
while($string[$i+1] == " "){
$i++;
}
$string[$i+1] = strtoupper($string[$i+1]);
$i++;
}
}
return $string;
}
this function would change:
Hi mi name is PETER. SOME TIMES I FORGOT TO DISABLE CAPS LOCK.
into:
Hi mi name is peter. Some times i forgot to disable caps lock.`
spiceee ddotty spiceee com
06-Mar-2006 04:53
`If you ever need to strtolower a string with href tags on it and doesn't want to mess with the characters inside a tag, this is for you.
<?php
function loweroutsidetags ($str) {
$chars = preg_split ("//", $str);
$tolower = true;
$str = '';
foreach ($chars as $k) {
if ($k == '<') { $tolower = false; }
if ($tolower) { $k = strtolower ($k); }
$str .= $k;
if ($k == '>') { $tolower = true; }
}
return $str;
}
?>
this:
echo loweroutsidetags('aALalala <a href="?q=CASEsENSITIVINESSinURLSareSTUPID">')
will give:
aalalala <a href="?q=CASEsENSITIVINESSinURLSareSTUPID">`
red at iklanumum dot com
23-Feb-2006 06:43
`I've seen this as a common use from script developers, so I would like to share the alternative way to compare 2 string (CASE INSENSITIVE) without using strtolower for faster process.
Use strcasecmp() for comparison purpose rather than comparing uncertain case of 2 string variables, because strcasecmp() is approximately 60% faster, moreover, the greater its string length the greater the difference,!
Ex. case :
$var1; -> could be a mixture of upper & lower case
$var2; -> could be a mixture of upper & lower case
To compare whether $var1 is exactly the same as $var2 (case insensitive manner):
Use -> if (strcasecmp($var1,$var2)==0)
rather than -> if (strtolower($var1)==strtolower($var2))`
Patrick
19-Jan-2006 10:57
`If you're considering using the below unhtmlentities function from phpContrib, I would suggest this one as an alternative:
<?php
function unhtmlentities($string)
{
// replace numeric entities
$string = preg_replace('~&#x([0-9a-f]+);~ei', 'chr(hexdec("\\1"))', $string);
$string = preg_replace('~&#([0-9]+);~e', 'chr(\\1)', $string);
// replace literal entities
$trans_tbl = get_html_translation_table(HTML_ENTITIES);
$trans_tbl = array_flip($trans_tbl);
return strtr($string, $trans_tbl);
}
?>
That was copied exactly from the html_entity_decode manual page. It'll handle numeric entities correctly, the below function won't.`
fackelkind
11-Jan-2006 12:03
`Nifty? :D
<?php
function is_lowercase ($str){
return ($str == strtolower ($str));
}
?>`
mhuggins57 at yahoo dot com
19-Jul-2005 04:04
`There's a ucfirst "function" to make the first character uppercase, but there's no "lcfirst" function to make the first character lowercase. Here's my own code to accomplish this.
<?
function lcfirst($str) {
return strtolower(substr($str, 0, 1)) . substr($str, 1);
}
?>
I found this particularly useful for generating XML nodes with the Reflection class.`
kmcdermott at perimeterinstitute dot ca
08-Dec-2004 01:04
`To do case insensitive comparisons in a database, strtolower() can be a quick and dirty solution:
$Sql = "SELECT * FROM tablename WHERE LOWER(column_name) = '".strtolower($my_var)."'";`
phpContrib (A T) esurfers d o t c o m
24-Sep-2004 11:07
`<?php
$b=html_entity_decode(strtolower(htmlentities($a)));
?>
will convert to lowercase most accented vocals
(it will convert � into &Agrave; into &agrave; into �)
This is not fast and clean code, it is just a quick oneliner to help you if you need a quick way to do it
�
Users with older versions of PHP can use:
$b=unhtmlentities(strtolower(htmlentities($a)));
// with unhtmlentities() as defined in the html_entity_decode() manual page:
function unhtmlentities ($string) {
$trans_tbl =get_html_translation_table (HTML_ENTITIES );
$trans_tbl =array_flip ($trans_tbl );
return strtr ($string ,$trans_tbl );
}`
bkimble at ebaseweb dot com
19-Jan-2003 10:39
`Heres a small function I wrote to stop people from submitting data that is ALL IN CAPS SO THEY CAN GET MORE ATTENTION THAT THE REST OF THE USER SUBMITTED DATA on my website :) If you can make it better, by all means do so. This function splits up words delimited by a space, and makes only the first letter of each word capitalized. You can easily modify it so it's only the very first word of the string. I've also added some exceptions so you don't make things like roman numerals look like "Iii" or "Xcmii" or something.
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]) $word[0] = strtoupper($word[0]);
array_push($newwords, $word);
}
return join(" ", $newwords);
}
BK`
tty01_at_rambler_dot_ru
19-Sep-2002 07:58
`Another solution for Double-Byte-Characters, based on iconv() functions, not sensible to the current locale, works on win32.
/* Converts charset */
function myConvertCharset($str, $from, $to)
{
if(@function_exists('iconv'))
{
return iconv($from, $to, $str);
}
else if(@function_exists('recode_string'))
{
return recode_string($from . '..' . $to, $str);
}
else
{
print "function iconv not exists";
return $str;
}
}
/* Converts a string to lowercase */
function my_strtolower($s)
{
$t = "windows-1251";
$d = "UTF-8";
return myConvertCharset(strtolower(myConvertCharset($s, $d, $t)), $t, $d);
}
print my_strtolower("СЛОВО Uppercase");`
12-Sep-2002 05:17
`This function is sensible to the current locale, namely the LC_CTYPE category (the default LC_CTYPE category is set from the LANG environment variable or by an explicit LC_CTYPE setting, but it can be overriden by the LC_ALL environment setting). If no locale setting is done in the enironment, the default locale will be C, for which the lowercase/uppercase conversion is based on the default character set of the system: this may convert only ASCII letters, or also ISO-8859-1 letters depending on the system...`
add a note
strtoupper strtok

Last updated: Sat, 27 Jan 2007
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