(PHP 4 >= 4.0.4, PHP 5, PHP 7, PHP 8)
ctype_graph — 做可打印字符串检测，空格除外
$text): bool
检查提供的 string 和 text 里面的字符输出都是可见的。
text需要被测试的字符串。
如果 text 里面的每个字符都是输出可见的（没有空白），就返回 true ；反之就返回 false 。
示例 #1 一个 ctype_graph() 例子
<?php
$strings = array('string1' => "asdf\n\r\t", 'string2' => 'arf12', 'string3' => 'LKA#@%.54');
foreach ($strings as $name => $testcase) {
if (ctype_graph($testcase)) {
echo "The string '$name' consists of all (visibly) printable characters.\n";
} else {
echo "The string '$name' does not consist of all (visibly) printable characters.\n";
}
}
?>
以上例程会输出：
The string 'string1' does not consist of all (visibly) printable characters. The string 'string2' consists of all (visibly) printable characters. The string 'string3' consists of all (visibly) printable characters.
注意:
如果给出一个 -128 到 255 之间(含)的int, 将会被解释为该值对应的ASCII字符 (负值将加上 256 以支持扩展ASCII字符). 其它整数将会被解释为该值对应的十进制字符串.