php中英文字符转换大小字代码

作者：袖梨 2022-06-24

每个单词的首字母转换为大写： ucwords()
第一个单词首字母变大写： ucfirst()
第一个单词首字母变小写： lcfirst()
所有字母变大写： strtoupper()

例子

代码如下

复制代码

<?php
echo strtoupper("Hello WORLD!");
?>

输出：

HELLO WORLD!

第一个单词首字母变大写：ucfirst()

代码如下

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<?php
$foo = 'where are doing?!';
$foo = ucfirst($foo); // where are doing?!

$bar = 'where are doing?!';
$bar = ucfirst($bar); // where are doing?!
$bar = ucfirst(strtolower($bar)); // where are doing?!
?>

所有字母变小写： strtolower()

代码如下	复制代码
<?php $str = "Mary Had A Little Lamb and She LOVED It So"; $str = strtolower($str); echo $str; // Prints mary had a little lamb and she loved it so ?>

每个单词的首字母转换为大写：ucwords()

代码如下

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<?php
$foo = 'where are doing?!';
$foo = ucwords($foo); // Where are doing?!

$bar = 'where are doing?!';
$bar = ucwords($bar); // Where are doing?!
$bar = ucwords(strtolower($bar)); // Where are doing?!
?>

第一个单词首字母变小写：lcfirst()

代码如下

复制代码

<?php
$foo = 'HelloWorld';
$foo = lcfirst($foo); // where are doing

$bar = 'where are doing?!';
$bar = lcfirst($bar); // where are doing?!
$bar = lcfirst(strtoupper($bar)); // where are doing?!
?>

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