How to change the type in php

php method to change type: 1. Convert to integer through (int) or (integer); 2. Convert to floating point type through (float), (double) or (real); 3. Convert to floating point type through ( string) into a string; 4. Convert into a Boolean type through (bool) or (boolean); 5. Convert into an array through (array); 6. Convert into an object through (object).

The operating environment of this tutorial: Windows 7 system, PHP version 8.1, Dell G3 computer.

php How to change the type?

PHP data type conversion

PHP data type conversion is a forced conversion. The PHP data types that are allowed to be converted are:

（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

There are three conversion methods for PHP data types:

Add the target type enclosed in parentheses before the variable to be converted

Use 3 specific Type conversion functions, intval(), floatval(), strval()

Use the general type conversion function settype(mixed var, string type)

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)   
?>

Supplement:

Judge string All composed of numbers

<?php
$str = "123"
if(ereg(&#39;^[0-9]+$&#39;, $str)) {
    // true
}
?>

Recommended learning: "PHP Video Tutorial"

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