PHP 字母和空格仅验证
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PHP letters and spaces only validation
提问by Andy Buckle
I'm validating my contact form using PHP and I've used the following code:
我正在使用 PHP 验证我的联系表单，并且使用了以下代码：
if (ctype_alpha($name) === false) {
$errors[] = 'Name must only contain letters!';
}
This code is works fine, but it over validates and doesn't allow spaces. I've tried ctype_alpha_sand that comes up with a fatal error.
这段代码工作正常，但它过度验证并且不允许空格。我试过了ctype_alpha_s，但出现了致命错误。
Any help would be greatly appreciated
任何帮助将不胜感激
回答by Martin
Regex is overkill and will perform worse for such a simple task, consider using native string functions:
正则表达式是矫枉过正，对于这样一个简单的任务会表现得更糟，考虑使用原生字符串函数：
if (ctype_alpha(str_replace(' ', '', $name)) === false) {
$errors[] = 'Name must contain letters and spaces only';
}
This will strip spaces prior to running the alpha check. If tabs and new lines are an issue you could consider using this instead:
这将在运行 alpha 检查之前去除空格。如果制表符和新行是一个问题，您可以考虑使用它：
str_replace(array("\n", "\t", ' '), '', $name);
回答by V_K
ctype_alpha only checks for the letters [A-Za-z]
ctype_alpha 只检查字母 [A-Za-z]
If you want to use it for your purpose, first u will have to remove the spaces from your string and then apply ctype_alpha.
如果您想将它用于您的目的，首先您必须从字符串中删除空格，然后应用 ctype_alpha。
But I would go for preg_match to check for validation. You can do something like this.
但我会去 preg_match 来检查验证。你可以做这样的事情。
if ( !preg_match ("/^[a-zA-Z\s]+$/",$name)) {
$errors[] = "Name must only contain letters!";
}
回答by Jinia
if (ctype_alpha(str_replace(' ', '', $name)) === false) {
$errors[] = 'Name must contain letters and spaces only';
}
回答by Epiphany
One for the UTF-8 world that will match spaces and letters from any language.
一种用于 UTF-8 世界，可以匹配来自任何语言的空格和字母。
if (!preg_match('/^[\p{L} ]+$/u', $name)){
$errors[] = 'Name must contain letters and spaces only!';
}
Explanation:
解释：
- [] => character class definition
- p{L} => matches any kind of letter character from any language
- Space after the p{L} => matches spaces
- + => Quantifier — matches between one to unlimited times (greedy)
- /u => Unicode modifier. Pattern strings are treated as UTF-16. Also causes escape sequences to match unicode characters
- [] => 字符类定义
- p{L} => 匹配来自任何语言的任何类型的字母字符
- p{L} => 后的空格匹配空格
- + => 量词 — 匹配一次到无限次（贪婪）
- /u => Unicode 修饰符。模式字符串被视为 UTF-16。还会导致转义序列匹配 unicode 字符
This will also match names like Bj?rk Guemundsdóttiras noted in a comment by Anthony Hatzopoulos above.
这也将匹配Bj?rk Guemundsdóttir 之类的名称，如上面 Anthony Hatzopoulos 的评论中所述。
