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The best way in my opinion is to use the browser's inbuilt HTML escape functionality to handle many of the cases. To do this simply create a element in the DOM tree and set the innerText of the element to your string. Then retrieve the innerHTML of the element. The browser will return an HTML encoded string.
The converted entities are: &, " (when ENT_NOQUOTES is not set), ' (when ENT_QUOTES is set), < and >. Parameters. string. The string to decode. flags. A bitmask of one or more of the following flags, which specify how to handle quotes and which document type to use. The ...
Sometimes, people do this replacement step twice by accident (once in client side JavaScript and once on the server, for example). So, they replace " with ', and then when they do the replacement again they get '. Then the browser interprets the first code and thinks you meant to display '.
While Hypertext Markup Language has been in use since 1991, HTML 4.0 from December 1997 was the first standardized version where international characters were given reasonably complete treatment.When an HTML document includes special characters outside the range of seven-bit ASCII, two goals are worth considering: the information's integrity, and universal browser display.
You can use the PHP htmlspecialchars_decode() function to convert the special HTML entities such as &, <, > etc. back to the normal characters (i.e. &, <, >). The htmlspecialchars_decode() function is opposite of the htmlspecialchars() function which converts special HTML characters into HTML entities. Let's check out an example:
In an HTML document, outside of an HTML tag, you should always "escape" these three characters: In this context, escaping means to replace them with HTML character entities.For example, < can be replaced with <.Another character entity that's occasionally useful is (the non-breaking space).. When you use UTF-8 as your character encoding, then, most of the time, the only escaping you ...
&"'<> Online Demo. Conclusion. The most secure flags for htmlspecialchars are: ENT_QUOTES | ENT_SUBSTITUTE in combination with UTF-8 encoding. Helper function. In real life, of course, you don't use htmlspecialchars that way because it's too verbose.
With the exception of HTML 2.0's ", &, <, and >, these entities are all new in HTML 4.0 and may not be supported by old browsers. Support in recent browsers is good. Support in recent browsers is good.
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