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:: //github.com/rafasashi/PHP-Custom-String-Functions
[PHP 4 >= 4.0.4, PHP 5, PHP 7, PHP 8]
ctype_upper — Check for uppercase character[s]
Description
ctype_upper[mixed $text]: bool
Parameters
textThe tested string.
Note:
If an int between -128 and 255 inclusive is provided, it is interpreted as the ASCII value of a single character [negative values have 256 added in order to allow characters in the Extended ASCII range]. Any other integer is interpreted as a string containing the decimal digits of the integer.
Warning
As of PHP 8.1.0, passing a non-string argument is deprecated. In the future, the argument will be interpreted as a string instead of an ASCII codepoint. Depending on the intended behavior, the argument should either be cast to string or an explicit call to chr[] should be made.
Return Values
Returns true if every character in text is an uppercase letter in the current locale. When called with an empty string the result will always be false.
Examples
Example #1 A ctype_upper[] example [using the default locale]
The above example will output:
The string AKLWC139 does not consist of all uppercase letters. The string LMNSDO consists of all uppercase letters. The string akwSKWsm does not consist of all uppercase letters.
See Also
- ctype_alpha[] - Check for alphabetic character[s]
- ctype_lower[] - Check for lowercase character[s]
- setlocale[] - Set locale information