Parsing PHP data type conversion methods through examples

PHP data type conversion is forced conversion. The PHP data types that are allowed to be converted are:

• (int), (integer): converted to integer
• (float), (double), (real): Convert to floating point type
• (string): Convert to string
• (bool), (boolean): Convert to Boolean type
• (array): Convert to array
• (object): Convert to object
  

There are three conversion methods for PHP data types:

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

One conversion method: (int) (bool) (float) (string) (array) (object)

<?php  
$num1=3.14;  
$num2=(int)$num1;  
var_dump($num1); //输出float(3.14)  
var_dump($num2); //输出int(3)  
?>

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

<?php  
$str="123.9abc";  
$int=intval($str);   //转换后数值：123  
$float=floatval($str); //转换后数值：123.9  
$str=strval($float);  //转换后字符串："123.9"  
?>

The third conversion method: settype();

<?php  
$num4=12.8;  
$flg=settype($num4,"int");  
var_dump($flg); //输出bool(true)  
var_dump($num4); //输出int(12)  
?>

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