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This article mainly shows you "php how to judge whether a number can be a decimal", the content is easy to understand, clear, hope to help you solve your doubts, the following let the editor lead you to study and learn "php how to judge whether a number can be a decimal" this article.

In PHP, you can use the strpos () function to determine whether a number is a decimal point, the function can find the decimal point in the number, return flase that the number does not have a decimal point, the number is not a decimal point, on the contrary, it means that the number has a decimal point, the number is a decimal point, the syntax is "if (number string,'.')! = false)".

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

Php's method of judging that a number cannot be a decimal

1. In PHP, you can use the strpos () function to find the first occurrence of a string in another string. The syntax of the strpos () function is:

Strpos (string,find,start)

Among them, it should be noted that:

The parameter strings is required to indicate the string to be searched, the find parameter is also required to specify the string to find, and the start parameter is optional to specify where to start the search.

The result returned is the first occurrence of the string in another string, or FALSE if the string is not found.

To determine whether it is a decimal, we can use the strpos function to find out whether the decimal point appears in the number string, as follows:

Strpos (numeric string,'.')

If it is a decimal, the result returned is the position where the decimal point first appeared. If it is not a decimal point, there is no decimal point, and the result returned is false.

2. You can determine whether the result returned by the strpos function in the previous step is equal to flase. If it is true, it is a decimal. If it is false, it is not a decimal.

The code is as follows:

Output result:

Example:

Output result:

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