PHP 8.3.0 RC 6 available for testing

lcfirst

(PHP 5 >= 5.3.0, PHP 7, PHP 8)

lcfirst使字符串的第一个字符小写

说明

lcfirst(string $string): string

如果第一个字符是 "A"(0x41)到 "Z"(0x5a)范围内的 ASCII 字符,则返回第一个字母是小写的 string

参数

string

输入的字符串。

返回值

返回转换后的字符串。

更新日志

版本 说明
8.2.0 大小写转换不在依赖于使用 setlocale() 设置的区域。只会转换 ASCII 字符。

示例

示例 #1 lcfirst() 例子:

<?php
$foo
= 'HelloWorld';
$foo = lcfirst($foo); // helloWorld

$bar = 'HELLO WORLD!';
$bar = lcfirst($bar); // hELLO WORLD!
$bar = lcfirst(strtoupper($bar)); // hELLO WORLD!
?>

参见

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User Contributed Notes 4 notes

up
17
phpnet at katylavallee dot com
14 years ago
Easiest work-around I've found for <5.3:
<?php

$string
= "CamelCase"
$string{0} = strtolower($string{0})
echo
$string; // outputs camelCase

?>
up
5
alex aulbach
15 years ago
In some cases maybe more useful?

$lower = strtolower( substr($upper,0,1) ) . substr($upper,1);
up
1
harmor
15 years ago
A slight modification from Northie's post here ( http://us2.php.net/manual/en/function.ucfirst.php#68443), where lcfirst may not exist in your PHP build:

<?php

if(false === function_exists('lcfirst'))
{
/**
* Make a string's first character lowercase
*
* @param string $str
* @return string the resulting string.
*/
function lcfirst( $str ) {
$str[0] = strtolower($str[0]);
return (string)
$str;
}
}

/* Tests */
echo var_dump(lcFirst(NULL)).'<br />'; /* string(0) "" */
echo var_dump(lcFirst('')) .'<br />'; /* string(0) "" */
echo var_dump(lcFirst('S')) .'<br />'; /* string(1) "S" */
echo var_dump(lcFirst('É')) .'<br />'; /* string(0) "�" */
echo var_dump(lcFirst('Hello World!!!')); /* string(14) "hello World!!!" */
up
-23
ahlers_wim at hotmail dot com
14 years ago
As of PHP release 6 direct reference modification is not permitted any more.
Reference modification is the process of manipulating characters within a string by means of the instruction such as:
$str[0] in the code line: $str[0] = strtolower($str[0]);

For this reason I have recoded the lcfirst function (on function_exists('lcfirst') === false) as follows:

<?php
if ( false === function_exists('lcfirst') ):
function
lcfirst( $str )
{ return (string)(
strtolower(substr($str,0,1)).substr($str,1));}
endif;
?>

Remarks:
Also notice that I have used the more modern scope delimeters (if:-endif;) and I have also removed the unnecessary intermediate result. That is, the manipulation is returned directly.
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