php 数据类型转换
本篇文章主要分享一下PHP数据类型转换的知识。
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:
(int)、(integer):转换成整形
(float)、(double)、(real):转换成浮点型
(string):转换成字符串
(bool)、(boolean):转换成布尔类型
(array):转换成数组
(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,例如:
(int) (bool) (float) (string) (array) (object) 下面通过实例说明:
<?php $num1=3.14; $num2=(int)$num1; //强制转换为int类型 var_dump($num1); //输出float(3.14) var_dump($num2); //输出int(3)
(2)使用3个具体类型的转换函数,intval()、floatval()、strval() ,实例如下:
<?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"
(3)使用通用类型转换函数settype(mixed var,string type) ,具体实例如下:
<?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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