(PHP 4 >= 4.0.4, PHP 5, PHP 7, PHP 8)
ctype_print — 检测可打印字符
如果在当前的语言环境下 text
里面的每个字符都能被实际输出(包括空白),那么就返回
true
;如果 text
包含控制字符或者没有任何输出的字符,那么就返回
false
。当使用空字符串调用时,结果始终为 false
。
示例 #1 ctype_print() 示例
<?php
$strings = array('string1' => "asdf\n\r\t", 'string2' => 'arf12', 'string3' => 'LKA#@%.54');
foreach ($strings as $name => $testcase) {
if (ctype_print($testcase)) {
echo "The string '$name' consists of all printable characters.\n";
} else {
echo "The string '$name' does not consist of all printable characters.\n";
}
}
?>
以上示例会输出:
The string 'string1' does not consist of all printable characters. The string 'string2' consists of all printable characters. The string 'string3' consists of all printable characters.