Why Does PHP Display Small Numbers Like 0.000021 in Scientific Notation?

Why is PHP printing my number as scientific notation, when I specified it as .000021?

In PHP, when working with numbers that are very small or very large, they are sometimes displayed in scientific notation (a.k.a. exponential notation) to make the number more readable. This is happening in your case because the number .000021 is very small.

To solve this, you can use the number_format() function to get the desired output:

$var = .000021;
echo number_format($var, 5); // Output: 0.000021

The number_format() function takes two parameters: the number to format and the number of decimal places to display. In this case, we're specifying 5 decimal places, which will give us the desired output.

Another option is to use the sprintf() function, which provides more control over the formatting of the output:

$var = .000021;
printf("%.5f", $var); // Output: 0.000021

The sprintf() function takes a format string as its first parameter and the variables to be formatted as the subsequent parameters. In this case, we're using the format string %.5f, which specifies that we want a floating-point number with 5 decimal places.

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