case-sensitive | 易学教程

PHP & Case Sensitivity

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In PHP, variable and constant names are case sensitive, while function names are not. As far as I am aware, PHP is the only language in which this happens. All other languages I have used are either totally case sensitive or totally case insensitive. Why is PHP partially case senstive? Please note, that I am not asking which names are case sensitive, but why . Update I thought I might add, for the benefit of those who think I am asking which , the following list: Case Sensitive Strings Variables Object Properties Constants, by default Case Insensitive Key Words etc Functions Object Methods

Like Case Sensitive in MySQL

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问题 I have a MySQL query: SELECT concat_ws(title,description) as concatenated HAVING concatenated LIKE \'%SearchTerm%\'; And my table is encoded utf8_general_ci with MyISAM. Searches seem to be case sensitive. I can\'t figure out how to fix it. What\'s going wrong and/or how do I fix it? 回答1: Try this: SELECT LOWER(CONCAT_WS(title,description)) AS concatenated WHERE concatenated LIKE '%searchterm%' or (to let you see the difference) SELECT LOWER(CONCAT_WS(title,description)) AS concatenated WHERE

git mv and only change case of directory

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问题 While I found similar question I didn\'t find an answer to my problem When I try to rename the directory from FOO to foo via git mv FOO foo I get fatal: renaming \'FOO\' failed: Invalid argument OK. So I try git mv FOO foo2 && git mv foo2 foo But when I try to commit via git commit . I get # On branch master # Untracked files: # (use \"git add <file>...\" to include in what will be committed) # # foo nothing added to commit but untracked files present (use \"git add\" to track) When I add the

Is Java case-sensitive? [closed]

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问题 I read somewhere that Java is case-sensitive. I have been unable to confirm this. Is it? If so, why? 回答1: I read somewhere that Java is case-sensitive. I have been unable to confirm this. Java source code is case sensitive, if you mean that. i.e. Double is not the same type as double , and you can have two different and separate variables myData and mydata . Is it? If so, why? Case sensitivity is the norm in most programming languages and environments, because lower and upper case letters are

How can I invert the case of a String in Java?

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问题 I want to change a String so that all the uppercase characters become lowercase, and all the lower case characters become uppercase. Number characters are just ignored. so \"AbCdE123\" becomes \"aBcDe123\" I guess there must be a way to iterate through the String and flip each character, or perhaps some regular expression that could do it. 回答1: I don't believe there's anything built-in to do this (it's relatively unusual). This should do it though: public static String reverseCase(String text

Is Java RegEx case-insensitive?

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问题 In Java, when doing a replaceAll to look for a regex pattern like: replaceAll(\"\\\\?i\\\\b(\\\\w+)\\\\b(\\\\s+\\\\1)+\\\\b\", \"$1\"); (to remove duplicate consecutive case-insensitive words, e.g. Test test), I\'m not sure where I put the ?i . I read that it is supposed to be at the beginning, but if I take it out then i catch duplicate consecutive words (e.g. test test), but not case-insensitive words (e.g. Test test). So I thought I could add the ?i in the beginning but that does not seem

How to compare character ignoring case in primitive types

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问题 I am writing these lines of code: String name1 = fname.getText().toString(); String name2 = sname.getText().toString(); aru = 0; count1 = name1.length(); count2 = name2.length(); for (i = 0; i < count1; i++) { for (j = 0; j < count2; j++) { if (name1.charAt(i)==name2.charAt(j)) aru++; } if(aru!=0) aru++; } I want to compare the Character s of two String s ignoring the case. Simply using IgnoreCase doesn\'t work. Adding \'65\' ASCII value doesn\'t work either. How do I do this? 回答1: The

MySQL case sensitive query [duplicate]

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This question already has an answer here: How can I make SQL case sensitive string comparison on MySQL? 11 answers This has been asked on this site before but I couldn't find a sufficient answer. If I'm doing a query like: Select Seller from Table where Location = 'San Jose' How can I make it return only Sellers with Location 'San Jose' instead of 'san jose' or something else? James mason MySQL queries are not case-sensitive by default. Following is a simple query that is looking for 'value'. However it will return 'VALUE', 'value', 'VaLuE', etc… SELECT * FROM `table` WHERE `column` = 'value'

Should URL be case sensitive?

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问题 I noticed that HTTP://STACKOVERFLOW.COM/QUESTIONS/ASK and http://stackoverflow.com/questions/ask both works fine - actually the previous one is converted to lowercase. I think that this makes sense for the user. If I look at Google then this URL works fine: http://www.google.com/intl/en/about/corporate/index.html but this one with \"ABOUT\" is not working: http://www.google.com/intl/en/ABOUT/corporate/index.html Should the URL be case sensitive? 回答1: According to W3's "HTML and URLs" they

Are PHP functions case sensitive?

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问题 I was digging through some code, and I found some calls to mySQL_fetch_array . Is PHP case sensitive about function names? I recall reading this somewhere but can\'t seem to find any reference to it. 回答1: I am quoting from this: Note: Function names are case-insensitive, though it is usually good form to call functions as they appear in their declaration. So, its looks like user-defined functions are not case-sensitive, there was a vote for making functions/objects under PHP5 case-sensitive.