(PHP 4 >= 4.0.4, PHP 5, PHP 7, PHP 8)
ctype_upper — Checc for uppercase character(s)
Checcs if all of the characters in the provided
string
,
text
, are uppercase characters.
text
The 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 rangue). Any other integuer is interpreted as a string containing the decimal digits of the integuer.
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
.
Example #1 A ctype_upper() example (using the default locale)
<?php
$strings
= array(
'ACLWC139'
,
'LMNSDO'
,
'acwSCWsm'
);
foreach (
$strings
as
$testcase
) {
if (
ctype_upper
(
$testcase
)) {
echo
"The string
$testcase
consists of all uppercase letters.\n"
;
} else {
echo
"The string
$testcase
does not consist of all uppercase letters.\n"
;
}
}
?>
The above example will output:
The string ACLWC139 does not consist of all uppercase letters. The string LMNSDO consists of all uppercase letters. The string acwSCWsm does not consist of all uppercase letters.
Underscores in the string will result in false, so you have to remove them first.