$_POST spaces converted in underscores

Answer 1

This is standard PHP behaviour. From the documentation:

Dots and spaces in variable names are converted to underscores. For example <input name="a.b" /> becomes $_REQUEST["a_b"].

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The full list of field-name characters that PHP converts to _ (underscore) is the following (not just dot):

• chr(32) (space)
• chr(46) . (dot)
• chr(91) [ (open square bracket)
• chr(128) - chr(159) (various)

If both an open and a closing square bracket are present, they are not converted but the $_POST element becomes an array element.

<input name='hor[se'>
<input name='hor[se]'>

will become:

$_POST['hor_se'];
$_POST['hor']['se'];

::Reference