How to force conversion of data type in php

php methods to force data type conversion: 1. The first function [int, bool, float, string, array, object]; 2. The second function [ intval() floatval() strval() ]; 3. The third function [settype()].

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php method of forcing data type conversion:

The first 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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