检查字符串是否为 PHP 中的全部大写
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/4211875/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
Check if a String is ALL CAPS in PHP
提问by Kirk Ouimet
What's the best way to see if a string contains all capital letters? I still want the function to return true if the string also contains symbols or numbers.
查看字符串是否包含所有大写字母的最佳方法是什么？如果字符串还包含符号或数字，我仍然希望函数返回 true。
回答by Winston Ewert
Check whether strtoupper($str) == $str
检查是否 strtoupper($str) == $str
To handle non-ascii use:
要处理非 ascii 使用：
mb_strtoupper($str, 'utf-8') == $str
mb_strtoupper($str, 'utf-8') == $str
回答by mario
If you want numbers included (and by "symbols" most everything else), then what you are actually trying to test for is the absenceof lowercase letters:
如果您希望包含数字（以及“符号”大多数其他所有内容），那么您实际上要测试的是缺少小写字母：
$all_upper = !preg_match("/[a-z]/", $string)
回答by Bill Criswell
You can use preg_match(). The regular expression would be /^[^a-z]+$/.
您可以使用preg_match(). 正则表达式将是/^[^a-z]+$/.
return preg_match('/^[^a-z]+$/', $string) === 1 ? true : false;
Here is the documentation for preg_match().
这是 preg_match() 的文档。
回答by iroel
PCRE solution:
PCRE解决方案：
$all_uppercase = preg_match('#^[A-Z]+$#', $string);
just make sure you don't use 'i' modifier
只要确保你不使用'i'修饰符
回答by Kracekumar
if(mb_strtoupper($string)===$string)
{
do the required task
}
else
{
some other task
}
回答by Gabi Dj
I think you are looking for this function
我想你正在寻找这个功能
$myString = "ABCDE";
if (ctype_upper($myString)) // returns true if is fully uppercase
{
echo "the string $myString is fully uppercase";
}
Hope it helps
希望能帮助到你
回答by RafaSashi
In addition to Alexander Morland's comment on Winston Ewert's answer if you need to deal with utf-8 accented characters you can use the following set of functions:
除了 Alexander Morland 对 Winston Ewert 的回答的评论之外，如果您需要处理 utf-8 重音字符，您还可以使用以下函数集：
define('CHARSET', 'utf-8');
function custom_substr($content='',$pos_start=0,$num_char=1){
$substr='';
if(function_exists('mb_substr')){
$substr=mb_substr($content,$pos_start,$num_char,CHARSET);
}
else{
$substr=substr($content,$pos_start,$num_char);
}
return $substr;
}
function custom_str_case($string='', $case='lower'){
$lower = array(
"a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m", "n", "o", "p", "q", "r", "s", "t", "u",
"v", "w", "x", "y", "z", "à", "á", "a", "?", "?", "?", "?", "?", "è", "é", "ê", "?", "ì", "í", "?", "?",
"e", "?", "ò", "ó", "?", "?", "?", "?", "ù", "ú", "?", "ü", "y", "а", "б", "в", "г", "д", "е", "ё", "ж",
"з", "и", "й", "к", "л", "м", "н", "о", "п", "р", "с", "т", "у", "ф", "х", "ц", "ч", "ш", "щ", "ъ", "ы",
"ь", "э", "ю", "я"
);
$upper = array(
"A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M", "N", "O", "P", "Q", "R", "S", "T", "U",
"V", "W", "X", "Y", "Z", "à", "á", "?", "?", "?", "?", "?", "?", "è", "é", "ê", "?", "ì", "í", "?", "?",
"D", "?", "ò", "ó", "?", "?", "?", "?", "ù", "ú", "?", "ü", "Y", "А", "Б", "В", "Г", "Д", "Е", "Ё", "Ж",
"З", "И", "Й", "К", "Л", "М", "Н", "О", "П", "Р", "С", "Т", "У", "Ф", "Х", "Ц", "Ч", "Ш", "Щ", "Ъ", "Ъ",
"Ь", "Э", "Ю", "Я"
);
if($case=='lower'){
$string = str_replace($upper, $lower, $string);
}
else{
$string = str_replace($lower, $upper, $string);
}
return $string;
}
function custom_strtolower($string){
return custom_str_case($string,'lower');
}
function custom_strtoupper($string){
return custom_str_case($string,'upper');
}
function custom_ucfirst($string){
$string=custom_strtolower($string);
$first_char=custom_substr($string,0,1);
$rest_char=custom_substr($string,1,custom_strlen($string));
$first_char=custom_strtoupper($first_char);
return $first_char.$rest_char;
}
function is_uppercase($string=''){
$is_uppercase=false;
if($string === custom_strtoupper($string)) {
$is_uppercase=true;
}
return $is_uppercase;
}
function is_ucfirst($string=''){
$first_char=custom_substr($string,0,1);
$is_ucfirst=is_uppercase($first_char);
return $is_ucfirst;
}
Resources:: https://github.com/rafasashi/PHP-Custom-String-Functions
资源:: https://github.com/rafasashi/PHP-Custom-String-Functions
回答by Brian Smith
This is how I handle ALL CAPS text for my comments section.
这就是我处理评论部分所有大写文本的方式。
if ($str == strtoupper($str))
{
$str = ucfirst(strtolower($str));
}
