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php中字母大小写转换函数

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Release: 2016-06-13 11:15:37
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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";
$str = strtoupper($str);
echo $str; // 打印 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!';
 $foo = ucwords($foo);             // Hello World!
 
 
 $bar = 'HELLO WORLD!';
 $bar = ucwords($bar);             // HELLO WORLD!
 $bar = ucwords(strtolower($bar)); // 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


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


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