How to convert string to number in php (three methods)

In PHP, a string can be coerced into a number. This is usually used when the input string needs to be converted into a numeric type for calculation.

1. Using casts

In PHP, you can use casts to convert a string into a number. Casting uses a plus sign ( ) to convert a string. For example:

$str = "123";
$int = (int)$str;

This will cast the string "123" to the integer value 123 and save it in the variable $int.

2. Use function conversion

PHP also provides some functions for converting strings to numeric types. The most common of these are the intval() and floatval() functions.

intval() function can convert a string into an integer. For example:

$str = "123";
$int = intval($str);

This will also convert the string "123" to the integer value 123.

floatval() function can convert a string to a floating point type. For example:

$str = "3.14";
$float = floatval($str);

will convert the string "3.14" to the floating point value 3.14.

In addition, PHP also provides some other functions for converting strings to other numeric types. For example, the doubleval() function can convert a string to a double-precision floating point type, while the octdec() and hexdec() functions can convert a string to an octal and hexadecimal integer value respectively.

Summary

In PHP, you can convert a string to a numeric type using cast or function conversion. Different functions work with different types of numbers. Using these functions can not only ensure the accuracy of type conversion, but also avoid errors caused by improper type conversion.

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