How to convert string to double type in php and retain two decimal places

Methods to convert and retain two decimal places: 1. Use the "floatval(string)" statement to convert the string to double type; 2. Use "number_format(double type value, 2)" or "sprintf" ("%.2f",double type value)" statement to retain two decimal places.

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

php converts string to double type And retain two decimal points

You can see two parts:

• Convert the string to double type: use floatval()

• Preserve two decimal points for double values: Use the number_format() or sprintf() function

  • number_format() can be used to format numbers by thousands grouping.

  • The sprintf() function writes a formatted string into a variable.

Sample code:

<?php
header(&#39;content-type:text/html;charset=utf-8&#39;);   
$double1=floatval("123");
echo "<br>使用number_format()保留两位小数：".number_format($double1, 2);
echo "<br>使用sprintf()保留两位小数：".sprintf("%.2f",$double1);

$double2=floatval("123.322");
echo "<br><br>使用number_format()保留两位小数：".number_format($double2, 2);
echo "<br>使用sprintf()保留两位小数：".sprintf("%.2f",$double2);
?>

Instructions:

When using the number_format() or sprintf() function to retain two decimal places, if the missing value is greater than 5, it will be rounded.

<?php
header(&#39;content-type:text/html;charset=utf-8&#39;);   
$double=floatval("123.325");
echo "使用number_format()保留两位小数：".number_format($double, 2);
echo "<br>使用sprintf()保留两位小数：".sprintf("%.2f",$double);
?>

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