(PHP 4 >= 4.0.4, PHP 5, PHP 7, PHP 8)
ctype_graph — 做可打印字符串檢測(cè)，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的。
text需要被測(cè)試的字符串。
如果 text 里面的每個(gè)字符都是輸出可見的（沒有空白），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(duì)應(yīng)的ASCII字符 (負(fù)值將加上 256 以支持?jǐn)U展ASCII字符). 其它整數(shù)將會(huì)被解釋為該值對(duì)應(yīng)的十進(jìn)制字符串.