Check if a String is ALL CAPS in PHP
What's the best way to see if a string contains all capital letters? I still want the function to return t开发者_Python百科rue if the string also contains symbols or numbers.
Check whether strtoupper($str) == $str
To handle non-ascii use:
mb_strtoupper($str, 'utf-8') == $str
ctype_upper(string $testString)
If you want numbers included (and by "symbols" most everything else), then what you are actually trying to test for is the absence of lowercase letters:
$all_upper = !preg_match("/[a-z]/", $string)
You can use preg_match()
. The regular expression would be /^[^a-z]+$/
.
return preg_match('/^[^a-z]+$/', $string) === 1 ? true : false;
Here is the documentation for preg_match().
http://php.net/manual/en/function.preg-match.php
PCRE solution:
$all_uppercase = preg_match('#^[A-Z]+$#', $string);
just make sure you don't use 'i' modifier
if(mb_strtoupper($string)===$string)
{
do the required task
}
else
{
some other task
}
I think you are looking for this function
$myString = "ABCDE";
if (ctype_upper($myString)) // returns true if is fully uppercase
{
echo "the string $myString is fully uppercase";
}
Hope it helps
In addition to Alexander Morland's comment on Winston Ewert's answer if you need to deal with utf-8 accented characters you can use the following set of functions:
define('CHARSET', 'utf-8');
function custom_substr($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", "â", "ã", "ä", "å", "æ", "ç", "è", "é", "ê", "ë", "ì", "í", "î", "ï",
"ð", "ñ", "ò", "ó", "ô", "õ", "ö", "ø", "ù", "ú", "û", "ü", "ý", "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"
);
$upper = array(
"A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M", "N", "O", "P", "Q", "R", "S", "T", "U",
"V", "W", "X", "Y", "Z", "À", "Á", "Â", "Ã", "Ä", "Å", "Æ", "Ç", "È", "É", "Ê", "Ë", "Ì", "Í", "Î", "Ï",
"Ð", "Ñ", "Ò", "Ó", "Ô", "Õ", "Ö", "Ø", "Ù", "Ú", "Û", "Ü", "Ý", "А", "Б", "В", "Г", "Д", "Е", "Ё", "Ж",
"З", "И", "Й", "К", "Л", "М", "Н", "О", "П", "Р", "С", "Т", "У", "Ф", "Х", "Ц", "Ч", "Ш", "Щ", "Ъ", "Ъ",
"Ь", "Э", "Ю", "Я"
);
if($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 $is_ucfirst;
}
Resources:: https://github.com/rafasashi/PHP-Custom-String-Functions
This is how I handle ALL CAPS text for my comments section.
if ($str == strtoupper($str))
{
$str = ucfirst(strtolower($str));
}
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