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Top Forums Shell Programming and Scripting Grep -q -F , what is the function of this script Post 303022803 by baris35 on Friday 7th of September 2018 12:32:50 PM
Old 09-07-2018
Dear Scott,
Thanks for your answer.
Aia mentioned or logic operator. I suppose what he implied is about below example:

Code:
$ false && echo howdy!

$ true && echo howdy!
howdy!
$ true || echo howdy!

$ false || echo howdy!
howdy!

I got the point clearly now.

Kind regards
Boris
 

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BOOLVAL(3)								 1								BOOLVAL(3)

boolval - Get the boolean value of a variable

SYNOPSIS
boolean boolval (mixed $var) DESCRIPTION
Returns the boolean value of $var. PARAMETERS
o $var - The scalar value being converted to a boolean. RETURN VALUES
The boolean value of $var. EXAMPLES
Example #1 boolval(3) examples <?php echo '0: '.(boolval(0) ? 'true' : 'false')." "; echo '42: '.(boolval(42) ? 'true' : 'false')." "; echo '0.0: '.(boolval(0.0) ? 'true' : 'false')." "; echo '4.2: '.(boolval(4.2) ? 'true' : 'false')." "; echo '"": '.(boolval("") ? 'true' : 'false')." "; echo '"string": '.(boolval("string") ? 'true' : 'false')." "; echo '"0": '.(boolval("0") ? 'true' : 'false')." "; echo '"1": '.(boolval("1") ? 'true' : 'false')." "; echo '[1, 2]: '.(boolval([1, 2]) ? 'true' : 'false')." "; echo '[]: '.(boolval([]) ? 'true' : 'false')." "; echo 'stdClass: '.(boolval(new stdClass) ? 'true' : 'false')." "; ?> The above example will output: 0: false 42: true 0.0: false 4.2: true "": false "string": true "0": false "1": true [1, 2]: true []: false stdClass: true SEE ALSO
floatval(3), intval(3), strval(3), settype(3), is_bool(3), Type juggling. PHP Documentation Group BOOLVAL(3)
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