How to cast value to float in php

Method: 1. Add the target type "(float)" enclosed in parentheses before the variable, the syntax is "(float)$val"; 2. Use floatval(), the syntax "floatval($val )"; 3. Use settype(), the syntax is "settype($val, "float")".

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

php forces the value Type conversion to float

Method 1: Add the target type enclosed in parentheses "(float)"## before the variable to be converted #

<?php
header("Content-type:text/html;charset=utf-8");
$str = &#39;123.456abc&#39;;
$float = (float)$str;
echo $float."<br>";
echo &#39;变量 $float 的类型为：&#39; . gettype($float) . &#39;<br>&#39;;
?>

Method 2: Use floatval() function

floatval(): used to obtain the floating point value of a variable;

<?php
header("Content-type:text/html;charset=utf-8");
$str = &#39;123.456abc&#39;;
$float = floatval($str);
echo $float."<br>";
echo &#39;变量 $float 的类型为：&#39; . gettype($float) . &#39;<br>&#39;;
?>

Output result:

Method 3: Use settype() function

Syntax:

The

settype ( $var ,$type )

settype() function is used to set the variable $var to the specified $type type.

Example

<?php
header("Content-type:text/html;charset=utf-8");
$str = &#39;123.456abc&#39;;
settype($str,"float");
echo $str."<br>";
echo &#39;修改后的类型为：&#39; . gettype($str) . &#39;<br>&#39;;
?>

Output result:

Description: The settable value of $type

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

• "integer" (or "int" since PHP 4.2.0)

• "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 onwards)

settype() function changes the type of the variable itself.

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