how to use PHP to convert numerical string to float?

Question

I got a string

    "1.0E+7"

And i hope convert it to a float

    10000000.00

Is there any php functions do this job? Or I should do this conversion myself?

Further more, I will receive many strings like this, some are numerical and some are in scientific format, how can I convert all of them correctly without knowing the content?

Why do you need to do this? PHP understands scientific notation, so it will treat these as floats when you use them in mathmatical expressions. — Barmar
– Barmar, Commented Nov 14, 2013 at 6:08
I need to check if the float have less than 3 digital number, I write a function myself(expload the number by "."), however when it meets mathmatical expression, it doesn't work. — Yang
– Yang, Commented Nov 14, 2013 at 6:25

Community · Accepted Answer · 2023-11-17 20:38:18Z

4

You can make use of floatval

<?php
echo floatval("1.0E+7").".00";//10000000.00

edited Nov 17, 2023 at 20:38

CommunityBot

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answered Nov 14, 2013 at 5:59

Shankar Narayana Damodaran

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Comments

5eeker · Accepted Answer · 2013-11-14 06:00:11Z

3

Try this example for converting your string var into float type:

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

answered Nov 14, 2013 at 6:00

5eeker

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Comments

tslater · Accepted Answer · 2013-11-14 06:02:13Z

3

Your best bet is to cast it....

$val ="1.0E+7"
(float) $val

answered Nov 14, 2013 at 6:02

tslater

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Comments

Sutandiono · Accepted Answer · 2013-11-14 06:01:21Z

2

You can use floatval():

$num = "1.0E+7";
$fl = floatval ($num);

printf ("%.02f", $fl);
// Result: 10000000.00

answered Nov 14, 2013 at 6:01

Sutandiono

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Comments

sectus · Accepted Answer · 2013-11-14 06:36:50Z

2

Try this

// type casting
var_dump((float) "1.0E+7");   // float(10000000)
// type juggling
var_dump("1.0E+7" + 0.0);     // float(10000000)
// function 
var_dump(floatval("1.0E+7")); // float(10000000)

// other stuff
var_dump(round("1.0E+7"));    // float(10000000)
var_dump(floor("1.0E+7"));    // float(10000000)
var_dump(ceil("1.0E+7"));     // float(10000000)
var_dump(abs("1.0E+7"));      // float(10000000) 

// weird
var_dump(unserialize("d:"."1.0E+7".";")); // float(10000000) 
var_dump(json_decode('1.0E+7')); // float(10000000)

And read type juggling, string conversion to numbers, floatval

edited Nov 14, 2013 at 6:36

answered Nov 14, 2013 at 5:58

sectus

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Comments

Veerendra · Accepted Answer · 2013-11-14 06:34:09Z

1

<?php
$var = '1.0E+7';
$float_value_of_var = floatval($var);
printf ("%.02f", $float_value_of_var);
// 10000000.00
?>

edited Nov 14, 2013 at 6:34

answered Nov 14, 2013 at 6:01

Veerendra

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