General rule: quote it if it can either be empty or contain spaces (or any whitespace really) or special characters (wildcards). Not quoting strings with spaces often leads to the shell breaking apart a single argument into many. $? doesn’t need quotes since it’s a numeric value. Whether $URL needs it depends on what you … Read more
Yes, both quotes are allowed in attribute values, but you must HTML-escape the quote you’re using as an attribute value delimiter, as well as other HTML-special characters like < and &: function encodeHTML(s) { return s.split(‘&’).join(‘&’).split(‘<‘).join(‘<’).split(‘”‘).join(‘"’).split(“‘”).join(‘'’); } var html=”<label my_attr=””+encodeHTML(attr_value)+'”>Text</label>’; However, you are usually much better off not trying to hack a document together from … Read more
Below, ruamel.yaml is used instead. ruamel.yaml is actively maintained. Unlike PyYAML, ruamel.yaml supports: YAML <= 1.2. PyYAML only supports YAML <= 1.1. This is vital, as YAML 1.2 intentionally breaks backward compatibility with YAML 1.1 in several edge cases. This would usually be a bad thing. In this case, this renders YAML 1.2 a strict … Read more
PHP has Xpath 1.0, if you have a string with double and single quotes, a workaround is using the Xpath concat() function. A helper function can decide when to use what. Example/Usage: xpath_string(‘I lowe “double” quotes.’); // xpath: ‘I lowe “double” quotes.’ xpath_string(‘It\’s my life.’); // xpath: “It’s my life.” xpath_string(‘Say: “Hello\’sen”.’); // xpath: concat(‘Say: … Read more
You need to use proper escaping/encoding. Either in HTML using character references: <p onclick=”exampleFunc(‘<div id="divId"></div>’);”>Some Text</p> Or in JavaScript using string escape sequences: <p onclick=”exampleFunc(‘\x3Cdiv\x20id\x3D\x22divId\x22\x3E\x3C/div\x3E’);”>Some Text</p>
Just try noquote(a) noquote(“a”) [1] a
According to php.net To specify a literal single quote, escape it with a backslash (\). It means you could have: <?php echo ‘<span onclick=”$(this).addClass(\’selected\’);”> </span>’; ?>
In your last example, echo “$(echo ‘!b’)” the exclamation point is not single-quoted. Because history expansion occurs so early in the parsing process, the single quotes are just part of the double-quoted string; the parser hasn’t recognized the command substitution yet to establish a new context where the single quotes would be quoting operators. To … Read more
execl(“/home/vlc”, “/home/vlc”, “/home/my movies/the movie i want to see.mkv”, (char*) NULL); You need to specify all arguments, included argv[0] which isn’t taken from the executable. Also make sure the final NULL gets cast to char*. Details are here: http://pubs.opengroup.org/onlinepubs/9699919799/functions/exec.html
Everyone who did the test concluded that using single quotes is marginally better performance wise. In the end single quotes result in just a concatenation while double quotes forces the interpreter to parse the complete string for variables. However the added load in doing that is so small for the last versions of PHP that … Read more