Returns true if bytes are in the range of \x00-\x1f or \x7f (del). Returns false if bytes are in the range of \x20-\x7e or \x80-\xff.
ctype_cntrl
(PHP 4 >= 4.0.4, PHP 5, PHP 7, PHP 8)
ctype_cntrl — 检测控制字符
参数
返回值
如果在当前区域设置中 text 里的每个字符都是控制字符，那么就返回
true；否则返回 false。当使用空字符串调用时，结果始终为 false。
示例
示例 #1 ctype_cntrl() 示例
<?php
$strings = array('string1' => "\n\r\t", 'string2' => 'arf12');
foreach ($strings as $name => $testcase) {
if (ctype_cntrl($testcase)) {
echo "The string '$name' consists of all control characters.\n";
} else {
echo "The string '$name' does not consist of all control characters.\n";
}
}
?>以上示例会输出：
The string 'string1' consists of all control characters. The string 'string2' does not consist of all control characters.
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