How to convert value to floating point type in php

php methods to convert values ​​into floating point types: 1. Use the floatval() function to get the floating point value of the variable, the syntax is "floatval ($var)"; 2. Use the settype() function to get the floating point value of the variable. Set a variable to a specified type with the syntax "settype($var, "float")".

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

php converts the value Floating point method

1. Use the floatval() function

The floating point conversion function floatval() can obtain the floating point of the variable. value.

Syntax:

floatval ($var)

• The parameter $var can be any scalar type and returns the float value of variable $var.

Note: floatval() cannot be used with arrays or objects.

Example:

<?php
$var = &#39;122.34343The&#39;;
$float_value_of_var = floatval ($var);
var_dump($float_value_of_var) ; // 打印出 122.34343
?>

2. Use the settype() function

The settype() function can set variables Set to the specified type.

Syntax:

settype ( $var , $type )

Example:

<?php
header("Content-type:text/html;charset=utf-8");
$str="123.456abc";
$float1 = settype($str, &#39;float&#39;);
echo &#39;变量 $str 的类型为：&#39;.gettype($float1).&#39;，值为：&#39;.$str.&#39;<br>&#39;;
$num=154;
$float2 = settype($num, &#39;float&#39;);
echo &#39;变量 $num 的类型为：&#39;.gettype($float2).&#39;，值为：&#39;.$num.&#39;<br>&#39;;
$bool=TRUE;
$float3 = settype($bool, &#39;float&#39;);
echo &#39;变量 $bool 的类型为：&#39;.gettype($float3).&#39;，值为：&#39;.$bool.&#39;<br>&#39;;
?>

The second parameter (the type of setting) can be:

• "boolean" (or "bool" since PHP 4.2.0)

• "integer" (or "int" since PHP 4.2. Starting from 0)

• "float" (only available after PHP 4.2.0, "double" used in older versions is now disabled)

• "string"

• "array"

• "object"

• "null" (from PHP 4.2.0)

Note: The settype() function will change the original type of the variable. If the setting is successful, it will return TRUE and if it fails, it will return FALSE.

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