ctype_cntrl()函数检查控制字符。如果文本中的每个字符都是当前语言环境的控制字符,则返回TRUE,否则返回FALSE。
ctype_cntrl(str)
str- 测试的字符串
如果文本中的每个字符都是当前语言环境中的控制字符,则ctype_cntrl()函数将返回TRUE,否则返回FALSE。
以下是一个例子-
<?php $arr = array('str1' =>"\n\r\t", 'str2' =>"demo76876test"); foreach ($arr as $a => $demo) { if (ctype_cntrl($demo)) { echo "$a has all control characters. \n"; }else { echo "$a does not have all control characters. \n"; } } ?>
输出结果
str1 has all control characters. str2 does not have all control characters.