convert string to float in php

phpCopy<?php
$mystring = "0.5674";
echo("This float number is of string data type ");
echo($mystring);
echo("\n");
$myfloat = floatval($mystring);
echo("Now, this float number is of float data type ");
echo($myfloat);
?>

phpCopy<?php
$mystring = "0.5674";
echo("This float number is of string data type ");
echo($mystring);
echo("\n");
$myfloat = number_format($mystring, 4);
echo("Now, this float number is of float data type ");
echo($myfloat);
?>

phpCopy<?php
$mystring = "0.5674";
echo("This float number is of string data type ");
echo($mystring);
echo("\n");
$myfloat = (float) $mystring;
echo("Now, this float number is of float data type ");
echo($myfloat);
?>