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)
$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()
$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();
$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。

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