PHP data type conversion (character to number, number to character)

The data type conversion of PHP is a mandatory conversion. The PHP data types that are allowed to be converted are:

• (int), (integer): Convert to integer
• (float), (double), (real): Convert to float
• (string): convert to string
• (bool), (boolean): Convert to boolean type
• (array): Convert to an array
• (object): Convert to object

There are three conversion methods for PHP data types:

• Prefix the variable to be converted with the target type enclosed in parentheses
• Use 3 specific types of conversion functions, intval(), floatval(), strval() [Memory: the type of destination you want to convert + val()]
• Use the generic type conversion function settype(mixed var,string type)

 The first conversion method: (int) (bool) (float) (string) (array) (object)

 

1. <?php   
2. $num1=3.14;   
3. $num2=(int)$num1;   
4. var_dump( $num1); //output float(3.14)   
5. var_dump( $num2); //output int(3)   
6. ?>  

The second conversion method: intval() floatval() strval()

 

1. <?php   
2. $str="123.9abc";   
3. $int=intval($str); //The converted value: 123   
4. $float=floatval($str); //The converted value: 123.9   
5. $str=strval($float); // converted string: "123.9"    
6. ?>  

The third conversion method: settype();

 

1. <?php   
2. $num4=12.8;   
3. $flg=settype($num4,"int");   
4. var_dump( $flg); //output bool(true)   
5. var_dump( $num4); //output int(12)   
6. ?> 

Reprinted from: http://www.tianzhigang.com/article.asp?id=280