這篇文章主要介紹了php ctype函數中文翻譯和示例,相關函數示例列出了多個,需要的朋友可以參考下。
PHP Ctype擴展是PHP4.2開始就內建的擴展,注意,Ctype系列函數都只有一個字符串類型參數,它們返回布爾值。
- $str = "0.1123";
- //檢查字符串所有字符是否為數字
- echo "ctype_digit:" . ctype_digit($str); //空
- //檢測是否為數字字符串,可為負數和小數
- echo "is_numberic:" . is_numeric($str); //1
從上面可以看出ctype_digit()和is_numberic()的區別。
中文翻譯
Ctype函數是PHP內置的字符串體測函數。主要有以下幾種
ctype_alnum -- Check for alphanumeric character(s)
檢測是否是只包含[A-Za-z0-9]
ctype_alpha -- Check for alphabetic character(s)
檢測是否是只包含[A-Za-z]
ctype_cntrl -- Check for control character(s)
檢查是否是只包含類是“/n/r/t”之類的字 符控制字符
ctype_digit -- Check for numeric character(s)
檢查時候是只包含數字字符的字符串(0-9)
ctype_graph -- Check for any printable character(s) except space
檢查是否是只包含有可以打印出來的字符(除了空格)的字符串
ctype_lower -- Check for lowercase character(s)
檢查是否所有的字符都是英文字母,并且都是小寫的
ctype_print -- Check for printable character(s)
檢查是否是只包含有可以打印出來的字符的字符串
ctype_punct -- Check for any printable character which is not whitespace or an alphanumeric character
檢查是否是只包含非數字/字符/空格的可打印出來的字符
ctype_space -- Check for whitespace character(s)
檢查是否是只包含類是“ ”之類的字符和空格
ctype_upper -- Check for uppercase character(s)
檢查是否所有的字符都是英文字母,并且都是大寫的
ctype_xdigit -- Check for character(s) representing a hexadecimal digit
檢查是否是16進制的字符串,只能包括 “0123456789abcdef”
有示例的喲
我們平常在遇到要對一些表單做簡單過濾的時候,往往不太愿意寫正則,而且在效率上,正則也是影響PHP運行速度的原因之一,所以在能不試用正則的時候盡量不試用正則。幸好PHP已經為我們考慮到了這一點,給我提供了Ctype函數。下面對一些Ctype函數做一些簡單介紹,以備用:
1、ctype_alnum — Check for alphanumeric character(s) 檢查字符串中只包含數字或字母,相當于正則[A-Za-z0-9]. 有返回值。成功時返回TRUE,失敗為FALSE;
- <?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"; // 輸出The string AbCd1zyZ9 consists of all letters or digits.
- } else {
- echo "The string $testcase does not consist of all letters or digits./n"; // 輸出 The string foo!#$bar does not consist of all letters or digits.
- }
- }
- ?>
2、ctype_alpha — Check for alphabetic character(s) 檢查字符串中只包含字母。 成功時返回TRUE,失敗為FALSE;
- <?php
- $strings = array('KjgWZC', 'arf12');
- foreach ($strings as $testcase) {
- if (ctype_alpha($testcase)) {
- echo "The string $testcase consists of all letters./n"; // 輸出 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>// 輸出 The string arf12 does not consist of all letters.
- }
- }
- ?>
3、ctype_cntrl — Check for control character(s) 檢查字符串中是否只包含" '/n' '/r' '/t' " 這樣的控制字符。
- <?php
- $strings = array('string1' => "/n/r/t", 'string2' => 'arf12');
- foreach ($strings as $name => $testcase) {
- if (ctype_cntrl($testcase)) {
- echo "The string '$name' consists of all control characters./n"; // 輸出 The string 'string1' consists of all control characters.
- } else {
- echo "The string '$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) 檢查字符串中是否只包含數字
- <?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";
- }
- }
- ?>
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