2025年02月13日 建站教程
php如何实现字符串大小写转换，下面web建站小编给大家简单介绍以下2个语法的运用！
1、利用strtoupper转成大写
<?php
header('content-type:text/html;charset=utf-8');
echo strtoupper("Hello WORLD!");
?>
2、利用mb_convert_case大小写转换
<?php $str = "mary had a Little lamb and she loved it so"; $str = mb_convert_case($str, MB_CASE_UPPER, "UTF-8"); echo $str."<br>"; // 输出 MARY HAD A LITTLE LAMB AND SHE LOVED IT SO $str = mb_convert_case($str, MB_CASE_TITLE, "UTF-8"); echo $str; // 输出 Mary Had A Little Lamb And She Loved It So ?> // MB_CASE_UPPER —— 转换为大写 // MB_CASE_LOWER —— 转换为小写 // MB_CASE_TITLE —— 单词首字母转换为大写
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