single-quotes | 易学教程

Making a new line with single quotes?

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Can I do a line break like this '\n' ? Or do I must use double quotes - "\n" ? You have to use double quotes. Otherwise, PHP will literally output \n . http://php.net/manual/en/language.types.string.php To output a newline (or any other control character for that matter) you must always use double quotes. An alternative to not use double quotes is chr() with the respective ASCII code as an argument: echo chr(10); // same as echo "\n"; Ashraf just add .PHP_EOL; to the end of your line using single quotes and you will have a new line No - \n in single quotes is '\n'. Yes - you have to use double

Making a new line with single quotes?

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问题 Can I do a line break like this '\n' ? Or do I must use double quotes - "\n" ? 回答1: You have to use double quotes. Otherwise, PHP will literally output \n . http://php.net/manual/en/language.types.string.php 回答2: To output a newline (or any other control character for that matter) you must always use double quotes. An alternative to not use double quotes is chr() with the respective ASCII code as an argument: echo chr(10); // same as echo "\n"; 回答3: just add .PHP_EOL; to the end of your line

How does the leading dollar sign affect single quotes in Bash?

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I need to pass a string to a program as its argument from the Bash CLI, e.g program "don't do this" The string may include any character like '$' , '\' , etc. and I don't want Bash to do any modification. So I think about using single quotes. However the following does not work: program 'don\'t do this' //escape doesn't work in single quote While the following two works: program $'dont\'t do this' //seems fine, but any other side effects? program 'dont'\''do this' //breaking into 3 parts The first approach seems better in that it acquires less pre modification (put the dollar symbol in front

How does the leading dollar sign affect single quotes in Bash?

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问题 I need to pass a string to a program as its argument from the Bash CLI, e.g program "don't do this" The string may include any character like '$' , '\' , etc. and I don't want Bash to do any modification. So I think about using single quotes. However the following does not work: program 'don\'t do this' //escape doesn't work in single quote While the following two works: program $'dont\'t do this' //seems fine, but any other side effects? program 'dont'\''do this' //breaking into 3 parts The

How do I escape a single quote in SQL Server?

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问题 I\'m trying to insert some text data into a table in SQL Server 9. The text includes a single quote(\'). How do I escape that? I tried using two single quotes, but it threw me some errors. eg. insert into my_table values(\'hi, my name\'\'s tim.\'); 回答1: Single quotes are escaped by doubling them up , just as you've shown us in your example. The following SQL illustrates this functionality. I tested it on SQL Server 2008: DECLARE @my_table TABLE ( [value] VARCHAR(200) ) INSERT INTO @my_table

Usage of the backtick character (`) in JavaScript?

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问题 In JavaScript, a backtick † seems to work the same as a single quote. For instance, I can use a backtick to define a string like this: var s = `abc`; Is there any way in which the behavior of the backtick actually differs from that of a single quote? † Note that among programmers, \"backtick\" is one name for what is more generally called the grave accent. Programmers also sometimes use the alternate names \"backquote\" and \"backgrave\". Also, on Stack Overflow and elsewhere, other common