PHP Tutorial - PHP boolval() function

PHP boolval function returns the boolean value of var.

Syntax

PHP boolval function has the following syntax.

boolean boolval ( mixed $var )

Parameter

PHP boolval function has the following parameter.

var - The scalar value being converted to a boolean.

Return

Returns the boolean value of var.

Example

What is the boolean value for converted from real value.


<?php// w w w  . j  av a 2s . co m
echo '0:        '.(boolval(0) ? 'true' : 'false')."\n";
echo '4:        '.(boolval(4) ? 'true' : 'false')."\n";
echo '0.0:      '.(boolval(0.0) ? 'true' : 'false')."\n";
echo '4.2:      '.(boolval(4.2) ? 'true' : 'false')."\n";
echo '"":       '.(boolval("") ? 'true' : 'false')."\n";
echo '"string": '.(boolval("string") ? 'true' : 'false')."\n";
echo '"0":      '.(boolval("0") ? 'true' : 'false')."\n";
echo '"1":      '.(boolval("1") ? 'true' : 'false')."\n";
echo '[1, 2]:   '.(boolval([1, 2]) ? 'true' : 'false')."\n";
echo '[]:       '.(boolval([]) ? 'true' : 'false')."\n";
?>

The code above generates the following result.