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This article mainly introduces php how to judge a number is a number of digits, has a certain reference value, interested friends can refer to, I hope you can learn a lot after reading this article, the following let the editor with you to understand.

Php to determine how many digits a number is: 1, use the floor () function to process the specified number and convert it into an integer; 2, use the strlen () function to count the number of characters contained in the integer, you can calculate the number of digits of the specified number, syntax "strlen (floor ($num))".

Operating environment of this tutorial: windows7 system, PHP7.1 version, DELL G3 computer

How does php determine how many digits a number is?

In php, there are two ways to determine how many digits a number is:

If the number is an integer, you can directly use the strlen () function to get the number of characters and determine the number of digits.

The strlen () function returns the length of the string. Returns the length of the string if successful, and 0 if the string is empty.

Numbers are floating-point numbers (including decimals), so you need to round them first (using the floor () function) and get the number of characters using the strlen () function.

The floor () function rounds down to the nearest integer.

Let's take a look at the implementation code:

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