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In PHP, when you have something in the URL like "var=true" in the URL, does the 'true' and 'false' in the URL get translated to boolean variables, or do they equal the text 'true' or 'false'? For instance, would, with the url having "var=false" in it:
if ($_GET['var'] == false) { ... }
work? Or would the variable always be true since it has text in it?
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Zero is used to represent false, and One is used to represent true. For interpretation, Zero is interpreted as false and anything non-zero is interpreted as true. To make life easier, C Programmers typically define the terms "true" and "false" to have values 1 and 0 respectively.
If you want to check that a variable is explicitly True or False (and is not truthy/falsy), use is ( if variable is True ). If you want to check if a variable is equal to 0 or if a list is empty, use if variable == 0 or if variable == [] .
Instead, comparison operators generate 0 or 1; 0 represents false and 1 represents true.
In general, a Boolean variable can have only two values - True or False. Or in other words, if a variable can have only these two values, we say that it's a Boolean variable. It's often used to represent the Truth value of any given expression. Numerically, True is equal to 1 and False is equal to 0.
No, $_GET will always contain only strings.
However, you can filter it to get a boolean.
FILTER_VALIDATE_BOOLEAN:
ReturnsTRUEfor"1","true","on"and"yes". ReturnsFALSEotherwise. IfFILTER_NULL_ON_FAILUREis set,FALSEis returned only for"0","false","off","no", and"", andNULLis returned for all non-boolean values.
Example:
$value = filter_input(INPUT_GET, "varname", FILTER_VALIDATE_BOOLEAN,
array("flags" => FILTER_NULL_ON_FAILURE));
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