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  • ctype_graph()

    (PHP 4 >= 4.0.4, PHP 5, PHP 7)

    做可打印字符串检测,空格除外

    说明

    ctype_graph(string $text): bool

    检查提供的string和$text里面的字符输出都是可见的。

    参数

    $text

    需要被测试的字符串。

    返回值

    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

    范例

    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.
    

    注释

    Note:

    如果给出一个-128 到 255 之间(含)的整数,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.

    参见

    上篇:ctype_digit()

    下篇:ctype_lower()