PHP doubleval() Function

The PHP doubleval() function returns the float value of a variable. This function is an alias of floatval() function.

Syntax

doubleval(variable)

Parameters

Return Value

Returns the float value of the given variable. Empty arrays return 0, non-empty arrays return 1.

Strings will most likely return 0 although this depends on the leftmost characters of the string. If the string is numeric or leading numeric then it will resolve to the corresponding float value, otherwise it is converted to 0.

Example:

The example below shows the usage of doubleval() function.

<?php
$x = "1234.56789";
echo doubleval($x)."\n";

$y = "1234.56789Hello";
echo doubleval($y)."\n";

$z = "Hello1234.56789";
echo doubleval($z)."\n";

$a = "12345E-3";
echo doubleval($a)."\n";

$b = "12345E3";
echo doubleval($b)."\n";
?>

The output of the above code will be:

1234.56789
1234.56789
0
12.345
12345000

Example:

Consider one more example which demonstrates the use of this function with arrays.

<?php
$arr1 = array();
echo doubleval($arr1)."\n";

$arr2 = array(1, 2, 3);
echo doubleval($arr2)."\n";
?>

The output of the above code will be:

0
1