ctype_upper
PHP function
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(PHP 4 >= 4.0.4, PHP 5, PHP 7, PHP 8)
Check for uppercase character(s)
Description
ctype_upper(mixed $text): bool
Checks if all of the characters in the provided string, text, are uppercase characters.
Parameters
textThe tested string. Integer Non-string
Return Values
Returns true if every character in text is an uppercase letter in the current locale. Empty-string
Examples
A ctype_upper() example (using the default locale)
php
<?php
$strings = array('AKLWC139', 'LMNSDO', 'akwSKWsm');
foreach ($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:
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.