How to change variable storage type in php

php methods to change the storage type of variables are: 1. Forced type conversion, use a function to convert a variable of one type to another type, such as the "(int)" function to convert a string into an integer; 2. , Automatic type conversion, when calculating two different types of values, PHP will automatically convert them to the same type; 3. Using the "settype()" function, you can set the variable to the specified type, but it can only be used PHP native data types.

Operating system for this tutorial: Windows 10 system, php8.1.3 version, Dell G3 computer.

In PHP, variable types are dynamic. This means that the type of the variable can be changed at runtime.

The following are some methods to change the storage type of PHP variables:

1. Forced type conversion:

Use forced type conversion syntax to convert a type The variable is converted to another type.

For example, to convert a string to an integer use the `(int)` or `intval()` function.

```php
$price = "20";
$price_int = (int) $price; //或者 $price_int = intval($price);
echo gettype($price); // 输出 string
echo gettype($price_int); // 输出 integer
```

2. Automatic type conversion:

When calculating two values ​​of different types, PHP will automatically convert them to the same type.

For example, in an arithmetic expression, if one operand is an integer and the other operand is a floating-point number, the integer will be automatically converted to a floating-point number.

```php
$num1 = 10;
$num2 = 3.14;
$result = $num1 + $num2;
echo $result; // 输出 13.14
echo gettype($result); // 输出 double
```

3. settype() function:

This function can set the variable to the specified type. Please note that the settype() function can only be used for PHP native data Types (int, float, string and bool), for other objects, you may need to use appropriate built-in functions and extension libraries for serialization encoding and decoding.

```php
$age = "30";
echo gettype($age); //输出 string
settype($age, "int");
echo gettype($age); //输出 integer
```

When using the `settype()` function, you need to pass the type you want to convert to in the second parameter. The `settype()` function returns TRUE if successful. Otherwise, it returns FALSE.

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