w3resource

PHP: doubleval() function

Description

The doubleval() function is used to get a float value of a variable. This function is an alias of floatval().

Version:

(PHP 4 and above)

Syntax:

doubleval(var_name)

Parameter:

Name Description Required /
Optional
Type
var_name The variable being checked. Required Mixed*

*Mixed : Mixed indicates that a parameter may accept multiple (but not necessarily all) types.

Return value:

Value Type: Float.

Example:

<?php$var_name = doubleval('422.300453test');echo $var_name;?>

Output:

422.300453

View the example in the browser

Practice here online :

See also

PHP Function Reference

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PHP: Tips of the Day

PHP - how to create a newline character?

Only double quoted strings interpret the escape sequences \r and \n as '0x0D' and '0x0A' respectively, so you want:

"\r\n"

Single quoted strings, on the other hand, only know the escape sequences \\ and \'.

So unless you concatenate the single quoted string with a line break generated elsewhere (e. g., using double quoted string "\r\n" or using chr function chr(0x0D).chr(0x0A)), the only other way to have a line break within a single quoted string is to literally type it with your editor:

$s = 'some text before the line break
some text after';

Make sure to check your editor for its line break settings if you require some specific character sequence (\r\n for example).

Ref : https://bit.ly/3hcyege