PHP 8.1.0 Released!


(PHP 4 >= 4.0.4, PHP 5, PHP 7, PHP 8)

ctype_lowerCheck for lowercase character(s)


ctype_lower(mixed $text): bool

Checks if all of the characters in the provided string, text, are lowercase letters.



The tested string.


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.

Return Values

Returns true if every character in text is a lowercase letter in the current locale.


Example #1 A ctype_lower() example (using the default locale)

= array('aac123''qiutoas''QASsdks');
foreach (
$strings as $testcase) {
    if (
ctype_lower($testcase)) {
"The string $testcase consists of all lowercase letters.\n";
    } else {
"The string $testcase does not consist of all lowercase letters.\n";

The above example will 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.

See Also

add a note add a note

User Contributed Notes

There are no user contributed notes for this page.
To Top