PHP 中的 ctype_lower()函数

ctype_lower() - 语法

ctype_lower ( $text );

此函数检查提供的字符串text中的所有字符是否都是小写字母。

ctype_lower() - 返回值

如果文本中的每个字符都是当前区域设置中的小写字母，则返回true。

ctype_lower() - 示例

<?php
   $strings=array('aac123', 'testing', "testin IS Done");
   
   foreach ($strings as $test) {
      if (ctype_lower($test)) {
         echo "$test consists of all lowercase letters.\n";
      }else {
         echo "$test does not have all lowercase letters.\n";
      }
   }
?> 

这将产生以下输出-

aac123 does not have all lowercase letters.
testing consists of all lowercase letters.
testin IS Done does not have all lowercase letters.