ctype_lower

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

ctype_lower锟斤拷小写锟街凤拷锟斤拷锟�

说锟斤拷

ctype_lower ( string $text ) : bool

锟斤拷锟斤拷峁╋拷锟� string 锟斤拷 text 锟斤拷锟斤拷锟斤拷址锟斤拷遣锟斤拷嵌锟斤拷锟叫⌒达拷锟侥革拷锟�

锟斤拷锟斤拷

text

锟斤拷要锟斤拷锟斤拷锟皆碉拷锟街凤拷锟斤拷锟斤拷

锟斤拷锟斤拷值

锟斤拷锟斤拷诘锟角帮拷锟斤拷锟斤拷曰锟斤拷锟斤拷锟� text 锟斤拷锟斤拷锟矫匡拷锟斤拷址锟斤拷锟斤拷锟叫⌒达拷锟侥革拷锟斤拷头锟斤拷锟� TRUE 锟斤拷锟斤拷之锟酵凤拷锟斤拷 FALSE 锟斤拷

锟斤拷锟斤拷

Example #1 一锟斤拷 ctype_lower() 锟斤拷锟斤拷 (使锟斤拷默锟较碉拷锟斤拷锟皆伙拷锟斤拷)

<?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";
    }
}
?>

锟斤拷锟斤拷锟斤拷锟教伙拷锟斤拷锟斤拷锟�

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.

注锟斤拷

Note:

锟斤拷锟斤拷锟斤拷锟揭伙拷锟� -128 锟斤拷 255 之锟斤拷(锟斤拷)锟斤拷锟斤拷锟斤拷, 锟斤拷锟结被锟斤拷锟斤拷为锟斤拷值锟斤拷应锟斤拷ASCII锟街凤拷 (锟斤拷值锟斤拷锟斤拷锟斤拷 256 锟斤拷支锟斤拷锟斤拷展ASCII锟街凤拷). 锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟结被锟斤拷锟斤拷为锟斤拷值锟斤拷应锟斤拷十锟斤拷锟斤拷锟街凤拷锟斤拷.

锟轿硷拷

  • ctype_alpha() - 锟斤拷锟斤拷锟街凤拷锟斤拷锟�
  • ctype_upper() - 锟斤拷锟斤拷写锟斤拷母锟斤拷锟�
  • setlocale() - 锟斤拷锟矫碉拷锟斤拷锟斤拷息