php中字母大小写转换函数
在php中字母大小写转换函数包括有:strtolower,strtoupper,ucfirst,ucwords等等函数,本文章来分别给各位介绍这几个字母大小写转换函数使用方法。
1.将字符串转换成小写
strtolower(): 该函数将传入的字符串参数所有的字符都转换成小写,并以小定形式放回这个字符串
代码如下 | 复制代码 |
echo strtolower("Hello WORLD!"); |
2.将字符转成大写
strtoupper(): 该函数的作用同strtolower函数相反,是将传入的字符参数的字符全部转换成大写,并以大写的形式返回这个字符串.用法同strtolowe()一 样.
代码如下 | 复制代码 |
$str = "Mary Had A Little Lamb and She LOVED It So"; |
3.将字符串首字符转换成大写
ucfirst(): 该函数的作用是将字符串的第一个字符改成大写,该函数返回首字符大写的字符串.用法同strtolowe()一样.
代码如下 | 复制代码 |
$foo = 'hello world!'; |
4.将字符串每个单词的首字符转换成大写
ucwords(): 该函数将传入的字符串的每个单词的首字符变成大写.如"hello world",经过该函数处理后,将返回"Hello Word".用法同strtolowe()一样
代码如下 | 复制代码 |
$foo = 'hello world!'; $foo = ucfirst($foo); // Hello world! $bar = 'HELLO WORLD!'; $bar = ucfirst($bar); // HELLO WORLD! $bar = ucfirst(strtolower($bar)); // Hello world! ?> |
5.第一个词首字母小写lcfirst()
代码如下 | 复制代码 |
|

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