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PHP : Function Reference : Character Type Functions : ctype_lower

ctype_lower

Check for lowercase character(s) (PHP 4 >= 4.0.4, PHP 5)
bool ctype_lower ( string text )

Example 421. A ctype_lower() example (using the default locale)

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<?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:

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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.

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ctype_alnum
ctype_alpha
ctype_cntrl
ctype_digit
ctype_graph
ctype_lower
ctype_print
ctype_punct
ctype_space
ctype_upper
ctype_xdigit

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