How to convert string to double floating point type in php

Conversion method: 1. Use forced type conversion and add the target type "(double)" enclosed in parentheses before the string variable to be converted, for example "(double)"23.2535""; 2. Use the doubleval() function, the syntax is "doubleval(string value)".

The operating environment of this tutorial: windows7 system, PHP7.1 version, DELL G3 computer

php string to double floating point type

#1. Forced type conversion--Add the target type enclosed in parentheses before the variable to be converted

The PHP data types that allow conversion are:

• (int), (integer): converted to integer

• (float), (double) , (real): Convert to floating point type

• (string): Convert to string

• (bool), (boolean): Convert to Boolean type

• (array): Convert to array

• (object): Convert to object

Example: Convert string type to float type

<?php   
$str="23.2535";   
$double=(double)$str;   
var_dump($str); 
var_dump($double); 
?>

Output:

Method 2: Use doubleval() Function

<?php   
$str="23.2535";   
$double=doubleval($str);   
var_dump($str); 
var_dump($double); 
?>

Description:

doubleval — alias of floatval()

This alias is after the function was renamed remaining issues. In older versions of PHP, there is no floatval() function, so you may need to use this floatval() alias function.

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