在PHP中将字符串转换为float

Question

I have a string value like this "0.00050722" and I want to convert its data type to double/float.

I've been trying floatval() and doubleval() but it always returns me a value of 0.

I need to get the exact of amount of 0.00050722 in a float datatype.

Answer 1

You just need to (typecast) to the desired type

    <?php
    $string = "0.00050722";
    $float = (float) $string;
    $float2 = $string + 0.0; //this works as well.
    $floatval = floatval($string);
    $double = (double) $string;

    // TEST
    printf("string:   %s - %d<br>", $string, is_float ($string));
    printf("float :   %g - %d<br>", $float, is_float ($float));
    printf("float2:   %g - %d<br>", $float2, is_float ($float2));
    printf("floatval: %g - %d<br>", $floatval, is_float($floatval));
    printf("double:   %g - %d<br>", $string, is_double ($double));

?>

Should result in:

string:   0.00050722 - 0
float :   0.00050722 - 1
float2:   0.00050722 - 1
floatval: 0.00050722 - 1
double:   0.00050722 - 1

Notice that concatenation also works.