• 首页
  • vue
  • TypeScript
  • JavaScript
  • scss
  • css3
  • html5
  • php
  • MySQL
  • redis
  • jQuery
  • ctype_upper()

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

    做大写字母检测

    说明

    ctype_upper(string $text): bool

    检查string和$text里面的字符是不是都是大写字母。

    参数

    $text

    需要被测试的字符串。

    返回值

    在当前语言环境下,如果$text里面的每个字符都是大写字母,就返回TRUE

    范例

    一个ctype_upper()例子(使用当前默认语言环境)

    <?php
    $strings = array('AKLWC139', 'LMNSDO', 'akwSKWsm');
    foreach ($strings as $testcase) {
        if (ctype_upper($testcase)) {
            echo "The string $testcase consists of all uppercase letters.\n";
        } else {
            echo "The string $testcase does not consist of all uppercase letters.\n";
        }
    }
    ?>
    

    以上例程会输出:

    The string AKLWC139 does not consist of all uppercase letters.
    The string LMNSDO consists of all uppercase letters.
    The string akwSKWsm does not consist of all uppercase letters.
    

    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

    Underscores in the string will result in false, so you have to remove them first.
    // after screwing around with function.ctype-upper
    // I found this simple solution
    if (strtolower($string) != $string)// its so simple!
    {
     echo "uppercase letters found in $string";
    }
    source: http://stackoverflow.com/questions/4426327/how-to-detect-if-string-contains-1-uppercase-letter-in-php

    上篇:ctype_space()

    下篇:ctype_xdigit()