ctype_lower
PHP function
Edit on GitHub ✎
(PHP 4 >= 4.0.4, PHP 5, PHP 7, PHP 8)
Check for lowercase character(s)
Description
ctype_lower(mixed $text): bool
Checks if all of the characters in the provided string, text, are lowercase letters.
Parameters
textThe tested string. Integer Non-string
Return Values
Returns true if every character in text is a lowercase letter in the current locale. Empty-string
Examples
A ctype_lower() example (using the default locale)
php
<?php
$strings = array('aac123', 'qiutoas', 'QASsdks');
foreach ($strings as $testcase) {
if (ctype_lower($testcase)) {
echo "The string $testcase consists of all lowercase letters.\n";
} else {
echo "The string $testcase does not consist of all lowercase letters.\n";
}
}
?>The above example will output:
output
The string aac123 does not consist of all lowercase letters.
The string qiutoas consists of all lowercase letters.
The string QASsdks does not consist of all lowercase letters.