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

SQL injection that gets around mysql_real_escape_string()

Consider the following query:

$iId = mysql_real_escape_string("1 OR 1=1");    
$sSql = "SELECT * FROM table WHERE id = $iId";

mysql_real_escape_string() will not protect you against this. The fact that you use single quotes (' ') around your variables inside your query is what protects you against this. The following is also an option:

$iId = (int)"1 OR 1=1";
$sSql = "SELECT * FROM table WHERE id = $iId";

Ref : https://bit.ly/32q3bJ7