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@benanamenOct 01.2017 — #Actually, Notepad++ will show the error IF you set the language to HTML or Php. Still, it is just a text editor. You should be using an IDE. 
@NogDogOct 02.2017 — #There are a range of things from "code editor" to "IDE" and everything in between. Many at either end of the spectrum can be configured with various settings and/or plug-ins to automatically do syntax-checking of various languages. Atom and VS Code are two somewhere in-between but closer to the "editor" end of the spectrum that can do this and are free, and work on any (reasonably common) OS.
That being said, if you are mixing PHP and HTML on the same file, HTML errors may not be detected since they can't really be seen until the PHP code runs and the actual output is generated. In that case, using something likehttp://validator.w3.org/ might be needed, running the HTML source that is actually generated by your PHP page through the validator.
Why UI Text Box And Button iFrame Present
Php Guys,
Why does not the UI Text Box and “Browse!” button get displayed below the iframe ?
[code]
<iframe src=”http://cnet.com”</iframe>
<form method=”post” action=””>
<div class=”form-group”>
<label for =”url”>Url: </label>
<input type=”text” name=”url_to_browse”><br>
<button type=”submit” class=”btn btn-default” name=”browse”>Browse!</button>
</div>
Get rid of the iframe code and the button gets displayed! What a mystery!
[code]
<form method=”post” action=””>
<div class=”form-group”>
<label for =”url”>Url: </label>
<input type=”text” name=”url_to_browse”><br>
<button type=”submit” class=”btn btn-default” name=”browse”>Browse!</button>
</div>
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@benanamenOct 01.2017 — #0
@NogDogOct 02.2017 — #There are a range of things from "code editor" to "IDE" and everything in between. Many at either end of the spectrum can be configured with various settings and/or plug-ins to automatically do syntax-checking of various languages. That being said, if you are mixing PHP and HTML on the same file, HTML errors may not be detected since they can't really be seen until the PHP code runs and the actual output is generated. In that case, using something like