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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.
Parameters | Description |
---|---|
##var | To be converted Variables. The possible values of|
type |
##type are:
|
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