PHP - 将long float转换为decimal [closed]

I got a float like this 1.17753e27 and want to convert it to a decimal number like 1.3243242

How do I do this?

<?php
$var = '122.34343The';
$float_value_of_var = floatval($var);
echo $float_value_of_var; // 122.34343
?>

float round ( float $val [, int $precision = 5 [, int $mode = PHP_ROUND_HALF_UP ]] )

you can try this code to convert long float to decimal float floor ( float $value )