Checks if all of the characters in the provided string,
text, are lowercase letters.
参数
text
The tested string.
返回值
Returns TRUE if every character in text is
a lowercase letter in the current locale.
例
例子 1. A ctype_lower() example (using the default locale)
<?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"; } } ?>
上例将输出：
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.
