PHP data type conversion_PHP tutorial-PHP Tutorial-php.cn

PHP data type conversion_PHP tutorial

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Release： 2016-07-13 10:31:26

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This article mainly shares the knowledge of 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): 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

PHP data types have three conversion methods:

(1) Add the target type enclosed in parentheses before the variable to be converted, for example:

(int) (bool) (float) (string) (array) (object) The following is an example:

<?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)

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(2) Use three specific types of conversion functions, intval(), floatval(), strval(). Examples are as follows:

<?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"

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(3) Use the general type conversion function settype(mixed var, string type). The specific examples are as follows:

<?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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