(PHP 4 >= 4.0.4, PHP 5, PHP 7, PHP 8)
ctype_graph — 做可打印字符串檢測，空格除外
$text): bool
檢查提供的 string 和 text 里面的字符輸出都是可見(jiàn)的。
text需要被測試的字符串。
如果 text 里面的每個(gè)字符都是輸出可見(jiàn)的（沒(méi)有空白），就返回 true ；反之就返回 false 。
示例 #1 一個(gè) 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";
}
}
?>
以上例程會(huì )輸出：
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:
如果給出一個(gè) -128 到 255 之間(含)的int, 將會(huì )被解釋為該值對應的ASCII字符 (負值將加上 256 以支持擴展ASCII字符). 其它整數將會(huì )被解釋為該值對應的十進(jìn)制字符串.