How to use floatval() function in php to convert to floating point type

In our daily programming, we often need to convert strings or other types of variables into floating point numbers. In Php, this process is also very simple, we only need to use the built-in function for conversion.

In Php, there are two very commonly used conversion functions: floatval() and intval(). The floatval() function can convert any type of variable into a floating point type, while the intval() function Any type of variable can be converted to an integer.

Let’s take a look at how to use the floatval() function to perform floating point conversion.

The syntax structure of the floatval() function is: floatval(string $string)

where $string represents the string variable that needs to be converted. This variable can be a string that we input manually. It can also be an externally passed value, such as data obtained from a database, etc.

The following is a simple example:

$str = "123.456";
$float = floatval($str);
echo $float; // 输出 123.456

In this example, we first define a string variable $str containing a floating point value, and then use the floatval() function to convert this Convert the string to a floating point value and save the result in the $float variable. Finally, we use echo to output the result to the screen, and the output result is 123.456.

In addition to converting strings, the floatval() function can also convert other types of variables, including integers, Boolean types, arrays, etc.

The following is another example:

$int = 123;
$float = floatval($int);
echo $float; // 输出 123.0

In this example, we first define an integer variable $int, and then use the floatval() function to convert this integer variable into a floating point type numeric value and save the result in the $float variable. Finally, we use echo to output the result to the screen, and the output result is 123.0.

It should be noted that there are some things that need to be paid attention to when performing floating point conversion. For example, if the string to be converted contains non-numeric characters, the conversion result will become 0. In addition, if the string to be converted contains multiple decimal points, only the number before the first decimal point will be used for conversion. If you need to avoid these problems when converting to floating point, consider using regular expressions before converting.

In addition to the floatval() function, there is also the intval() function for integer conversion. The usage of this function is very similar to floatval(). You only need to change the function name to intval() and add the variables that need to be converted when calling.

Summary: In Php, it is very simple to use built-in functions to convert floating point types. Use the floatval() function to convert any type of variable into a floating-point value, and use the intval() function to convert any type of variable into an integer value. Whether in developing web applications or other types of applications, these two functions are used very frequently.

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