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Php detects that an integer is several digits: 1, use the strval () function to convert the integer into a numeric string, the syntax "$str = strval ($int);"; 2, use the strlen () function to get the length of the numeric string (the number of numeric characters), the syntax "strlen ($string)".

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

The number of digits in a natural number is called digits. The number of digits in a natural number is called digits. The number with one digit is one digit, the number with two digits is two digits, and the number with three digits is three digits. The number with n digits is n digits.

For example, 123, three digits, three digits.

So how to use php to detect how many digits an integer is?

Realize the idea:

Converts an integer to a numeric string. (conversion method strval () or settype () function)

Use the strlen () or mb_strlen () function to get the length of the numeric string (the number of numeric characters)

Implementation code:

Description:

There are two functions commonly used in PHP to calculate the length of a string, which are the strlen () and mb_strlen () functions. When dealing with all-English strings, the two functions have the same effect, while when dealing with mixed or pure Chinese strings, the two functions will have some differences.

In the strlen () function, numbers, English, decimal points, underscores and spaces account for one character length, while one GB2312-encoded Chinese character occupies two character length and one UTF-8-encoded Chinese character occupies three character length.

Unlike the strlen () function, in the mb_strlen () function, both Chinese characters, English numbers, decimal points, underscores and spaces occupy only one character length.

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