How to convert String to Float in PHP ?
Last Updated : 18 Sep, 2024
Converting a string to a float in PHP is a common requirement when handling numeric data stored in string format. This conversion allows the numeric string to be used in calculations or comparisons, ensuring accurate manipulation of data within the program.
There are many methods to convert a string into a number in PHP, some of them are discussed below:
Using floatval() function
The floatval() function in PHP converts a string to a floating-point number. It extracts the numeric value from the string, ignoring non-numeric characters. This approach is simple and efficient for converting string representations of numbers into usable float values.
Syntax
$floatvar = floatval($stringvar)
Example: In this example we converts a number in string format ("1000.314") into a float using the floatval() function and then prints the converted float value (1000.314).
PHP <?php // Number in string format $stringvar = "1000.314"; // converts string into float $floatvar = floatval($stringvar); // prints the value of above variable as a float echo "Converted float = ".$floatvar; ?>
Output:
Converted float = 1000.314
Using Typecasting
Typecasting in PHP allows directly converting a string to a float by prefixing the string with (float). This approach forces the string to be interpreted as a floating-point number, enabling mathematical operations or further manipulation of the data.
Syntax
$floatvar = (float)$stringvar
Example: In this example we converts a string ("1000.314") into a float using typecasting (float). It then prints the converted float value. Typecasting directly forces the string to be treated as a floating-point number.
PHP <?php // Number in string format $stringvar = "1000.314"; // converts string into float $floatvar = (float)$stringvar; // prints the value of above variable as a float echo "Converted float = ".$floatvar; ?>
Output:
Converted float = 1000.314
The number_format() function in PHP is primarily used to format a number with grouped thousands and specified decimal points. While it formats a string as a number, it returns a string, requiring additional conversion if a float is needed.
Note: The number_format() function is an inbuilt function in PHP that is used to format a number with grouped thousands. It returns the formatted number on success otherwise it gives E_WARNING on failure.
Syntax
string number_format( $number, $decimals, $decimalpoint, $sep )
Example: In this example we use the number_format() function to format a string ("1000.3145635") into a float with 6 decimal places, but it returns the value as a string.
PHP <?php // Number in string format $stringvar = "1000.3145635"; // converts string into float with 6 decimals $floatvar = number_format($stringvar, 6); // prints the value of above variable as a string echo "Converted float = ".$floatvar; ?>
Output:
Converted float = 1000.314564
Using sscanf() Function
The sscanf() function in PHP parses input based on a specified format. When converting a string to a float, sscanf() reads the string and extracts the float value, making it an effective way to handle string-to-float conversions.
Syntax:
sscanf($string, $format, &$variable);
Example: In this example we use the sscanf() function to parse a string ("1000.314") into a float. It then prints the converted float value using the format specifier %f.
PHP <?php $stringvar = "1000.314"; sscanf($stringvar, "%f", $floatvar); echo "Converted float = " . $floatvar; ?>
OutputConverted float = 1000.314
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