PHP检查字符串是否包含字母 [英] PHP Check if string contains a letter

问题描述

我正在创建登录名，并希望允许我的用户通过用户名或电子邮件登录.如何检查字符串是否包含字母，在这种情况下为@，这样我就可以正确处理它.我会使用strstr还是strpos?谢谢！

I am creating a login and want to allow my users to login either by username or email. How would I check if a string contains a letter, in this case @ so I can handle it correctly. Would I use strstr or strpos? Thanks!

推荐答案

您可以使用其中任何一个.由于@不应出现在开头，因此您甚至不需要strpos结果布尔值变通办法.

You can use either. Since the @ should not appear at the start, you don't even need the strpos result booleanization workaround.

如果您想断言这是一个有效的电子邮件地址，请尝试

If you want to assert that it's a valid email address, then also try

filter_var($str, FILTER_VALIDATE_EMAIL)

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