PHP data type conversion conversion

This article mainly shares with you the conversion of PHP data type conversion. This article mainly shares it with you in the form of code. I hope it can help you.

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

• (int), (integer): converted 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

There are three conversion methods for PHP data types:

• Add parentheses before the variable to be converted. The target type

• uses three specific types of conversion functions, intval(), floatval(), strval()

• uses 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)   
?>

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