php ctype函数中文翻译和示例 |
本文标签:ctype函数,中文翻译 PHP Ctype扩展是PHP4.2开始就内建的扩展,注意,Ctype系列函数都只有一个字符串类型参数,它们返回布尔值 。 复制代码 代码如下: $str = "0.1123"; //检查字符串所有字符是否为数字 echo "ctype_digit:" . ctype_digit($str); //空 //检测是否为数字字符串,可为负数和小数 echo "is_numberic:" . is_numeric($str); //1 从上面可以看出ctype_digit()和is_numberic()的区别 。 中文翻译 Ctype函数是PHP内置的字符串体测函数 。主要有以下几种 ctype_alnum -- Check for alphanumeric character(s) ctype_alpha -- Check for alphabetic character(s) ctype_cntrl -- Check for control character(s) ctype_digit -- Check for numeric character(s) ctype_graph -- Check for any printable character(s) except space ctype_lower -- Check for lowercase character(s) ctype_print -- Check for printable character(s) ctype_punct -- Check for any printable character which is not whitespace or an alphanumeric character ctype_space -- Check for whitespace character(s) ctype_upper -- Check for uppercase character(s) ctype_xdigit -- Check for character(s) representing a hexadecimal digit 有示例的哟 我们平常在遇到要对一些表单做简单过滤的时候,往往不太愿意写正则,而且在效率上,正则也是影响PHP运行速度的原因之一,所以在能不试用正则的时候尽量不试用正则 。幸好PHP已经为我们考虑到了这一点,给我提供了Ctype函数 。下面对一些Ctype函数做一些简单介绍,以备用: 复制代码 代码如下: <?php $strings = array(AbCd1zyZ9, foo!#$bar); foreach ($strings as $testcase) { if (ctype_alnum($testcase)) { echo "The string $testcase consists of all letters or digits.\n"; \\ 输出The string AbCd1zyZ9 consists of all letters or digits. } else { echo "The string $testcase does not consist of all letters or digits.\n"; \\ 输出 The string foo!#$bar does not consist of all letters or digits. } } ?> 2、ctype_alpha — Check for alphabetic character(s) 检查字符串中只包含字母 。 成功时返回TRUE,失败为FALSE; 复制代码 代码如下: <?php $strings = array(KjgWZC, arf12); foreach ($strings as $testcase) { if (ctype_alpha($testcase)) { echo "The string $testcase consists of all letters.\n"; \\ 输出 The string KjgWZC consists of all letters. } else { echo "The string $testcase does not consist of all letters.\n";<span style="white-space:pre"> </span>\\ 输出 The string arf12 does not consist of all letters. } } ?> 3、ctype_cntrl — Check for control character(s) 检查字符串中是否只包含" \n \r \t " 这样的控制字符 。 复制代码 代码如下: <?php $strings = array(string1 => "\n\r\t", string2 => arf12); foreach ($strings as $name => $testcase) { if (ctype_cntrl($testcase)) { echo "The string $name consists of all control characters.\n"; \\ 输出 The string string1 consists of all control characters. } else { echo "The string $name does not consist of all control characters.\n"; \\ The string string2 does not consist of all control characters. } } ?> 4、ctype_digit — Check for numeric character(s) 检查字符串中是否只包含数字 复制代码 代码如下: <?php $strings = array(1820.20, 10002, wsl!12); foreach ($strings as $testcase) { if (ctype_digit($testcase)) { echo "The string $testcase consists of all digits.\n"; } else { echo "The string $testcase does not consist of all digits.\n"; } } ?> |