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Single quotes, double quotes, backslashes and null characters in all user-supplied data all have a backslash prepended to them before being passed to the script in the $_GET, $_REQUEST, $_POST and $_COOKIE global variables. Developers can then in theory use string concatenation to construct safe SQL queries with data provided by the user.
Single or double quotation marks denote either speech or a quotation. Double quotes are preferred in the United States, and also tend to be preferred in Australia [11] [12] (though the Australian Government prefers single quotes) [13] and Canada. Single quotes are more usual in the United Kingdom, Ireland and South Africa, though double quotes ...
The closing single quotation mark is identical in form to the apostrophe and similar to the prime symbol. The double quotation mark is identical to the ditto mark in English-language usage. It is also similar to—and often used to represent—the double prime symbol. These all serve different purposes.
If the first character of a line, including indentation, is an asterisk (*) the whole line is considered as a comment, while a single double quote (") begins an in-line comment which acts until the end of the line. ABAP comments are not possible between the statements EXEC SQL and ENDEXEC because Native SQL has other usages for these characters.
Microsoft added the single guillemets to CP1252 and similar sets used in Windows at 0x8B and 0x9B (139 and 155) (where the ISO standard placed C1 control codes). The ISO 8859 locations were inherited by Unicode, which added the single guillemets at new locations: U+00AB « LEFT-POINTING DOUBLE ANGLE QUOTATION MARK
In SGML, HTML and XML documents, the logical constructs known as character data and attribute values consist of sequences of characters, in which each character can manifest directly (representing itself), or can be represented by a series of characters called a character reference, of which there are two types: a numeric character reference and a character entity reference.
One of the oldest examples is in shell scripts, where single quotes indicate a raw string or "literal string", while double quotes have escape sequences and variable interpolation. For example, in Python , raw strings are preceded by an r or R – compare 'C:\\Windows' with r'C:\Windows' (though, a Python raw string cannot end in an odd number ...
left single quotation mark; right single quotation mark; u+2018; ... u+201b: pi, initial quote common “ ” left double quotation mark; right double quotation mark ...