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php字符串首字母转换大小写

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Release： 2016-06-06 16:05:05
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将字符串中  每个单词的首字母转换为大写：ucwords()

$foo = 'hello world!';
$foo = ucwords($foo);             // Hello World!

$bar = 'HELLO WORLD!';
$bar = ucwords($bar);             // HELLO WORLD!
$bar = ucwords(strtolower($bar)); // Hello World!
?>

第一个词首字母变大写：ucfirst()

$foo = 'hello world!';
$foo = ucfirst($foo);             // Hello world!

$bar = 'HELLO WORLD!';
$bar = ucfirst($bar);             // HELLO WORLD!
$bar = ucfirst(strtolower($bar)); // Hello world!
?>

第一个词首字母小写lcfirst()


$foo = 'HelloWorld';
$foo = lcfirst($foo);             // helloWorld

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

字母变大写：strtoupper()

字母变小写：strtolower()

 

 

 

 

 

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