【PHP】字符串去空格并将每个单词首字母转换成大写de多种解法

问题描述

camel_case

camel_case("hello case"); // => "HelloCase"
camel_case("camel case word"); // => "CamelCaseWord"

分析

解决方案

数组元素转换大写

function camel_case(string $s): string {
//字符串去空格后判断长度，如果去掉空格后长度为0，就返回空字符串
$s = trim($s);
if(strlen($s) == 0){
return $s;
}
//转换数组
$arr = explode(" ",$s);
//遍历，转换大小写，进行字符串拼接
$end_s = "";
foreach ($arr as $v){
$end_s.=ucfirst($v);
}
return $end_s;
}

使用

array_map

对数组元素转换后转字符串

function camel_case(string $s): string {
return empty($s) ? "" : implode(array_map('ucfirst', explode(" ", trim($s))));
}

ucwords

直接转换每个字母后去空格

function camel_case(string $s): string
{
$upper_case = ucwords($s);
return str_replace(' ', '', $upper_case);
}

用正则表达式去空格

function camel_case(string $s): string {
$s = ucwords($s);
$s = preg_replace('/\s(?=)/', '', $s);
return $s ;
}