Double not (!!) operator in PHP
In the Double not operator (!!), the first not i.e. ! is used to negate a value, whereas the second not i.e.! again negates. To implement Double not operator in PHP, the code is as follows−
Example
Live Demo
<?php
$str = "0.1";
echo "Value = $str";
$res = !!$str;
echo "\nDouble Negated Value = $res";
?>
Output
This will produce the following output−
Value = 0.1
Double Negated Value = 1
Example
Let us now see another example −
Live Demo
<?php
$str = "100.56";
echo "String = $str";
$num = floatval($str);
echo "\nNumber (Converted from String) = $num";
$res = !!$num;
echo "\nDouble Negated Value = $res";
?>
Output
This will produce the following output−
String = 100.56
Number (Converted from String) = 100.56
Double Negated Value = 1
Published on 26-Dec-2019 14:42:09
