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PHP中数据类型转换的三种方式_php技巧

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Release： 2016-05-16 20:18:19
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PHP的数据类型转换属于强制转换，允许转换的PHP数据类型有：

1.（int）、（integer）：转换成整形
2.（float）、（double）、（real）：转换成浮点型
3.（string）：转换成字符串
4.（bool）、（boolean）：转换成布尔类型
5.（array）：转换成数组
6.（object）：转换成对象

PHP数据类型有三种转换方式：

1.在要转换的变量之前加上用括号括起来的目标类型
2.使用3个具体类型的转换函数，intval()、floatval()、strval()
3.使用通用类型转换函数settype(mixed var,string type)

第一种转换方式： (int)  (bool)  (float)  (string)  (array) (object)

复制代码 代码如下:

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

第二种转换方式：  intval()  floatval()  strval()

复制代码 代码如下:

$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"   
?> 

第三种转换方式：  settype();
复制代码 代码如下:

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

千里之行，始于足下。改变将来，从现在开始。改变现在，就是改变未来。

Related labels：
php Data type conversion
source：php.cn
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