How to change data type in php

Methods to change the data type: 1. Forced type conversion, add the target type enclosed in parentheses before the variable to be converted. Example "(int)3.14"; 2. Use the specific type conversion functions intval(), floatval() and strval(); 3. Use the general type conversion function settype().

The operating environment of this tutorial: windows7 system, PHP7.1 version, DELL G3 computer

Method 1. Forced type conversion- -Add the target type enclosed in parentheses

before the variable to be converted. The PHP data types allowed for conversion are:

• (int), ( integer): Convert 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

Example:

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

Method 2: Use a specific type conversion function , 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"    
?>

Method 3: Use the general type conversion function settype()

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

Instructions: settype( ) function is used to set the type of a variable. The syntax is as follows:

settype ( $var , $type )

Set the type of variable var to type.

To be converted Variables. The possible values ​​of settype() function will affect The type of the original variable.

Parameters	Description
##var
type	##type are: "boolean" (or "bool" since PHP 4.2.0) "integer" (or "int" since PHP 4.2.0) "float" (only available after PHP 4.2.0, "double" used in older versions is now deprecated) "string" "array" "object" "null" (from PHP 4.2.0)

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