Ctype Functions
PHP Manual


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

ctype_lowerCheck for lowercase character(s)


bool ctype_lower ( string $text )

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



The tested string.

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.



If an integer 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.

See Also

Ctype Functions
PHP Manual