How to convert php string to floating point data

Conversion method: 1. Add the target type "(float)", "(double)" or "(real)" enclosed in parentheses before the string variable; 2. Use "floatval(character String)" statement; 3. Use the "settype(string variable, "float")" statement.

The operating environment of this tutorial: windows7 system, PHP version 8.1, DELL G3 computer

php string conversion For floating-point data

Method 1: Add the target type enclosed in parentheses "(float)", "before the string variable (double)" or "(real)"

• ##(float), (double), (real): will The target variable is converted to a floating point type;

Example:

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

Output result:

##Method 2: Use the floatval() function

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

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

Output result:

Method 3: Use the settype() function

The settype() function is used to set the type of a variable.

Syntax:

settype (mixed &$var, string $type)

$type: The possible values ​​of type are.

"boolean" (or "bool" since PHP 4.2.0)
"integer" (or "int" , starting from PHP 4.2.0)
"float" (only available after PHP 4.2.0, "double" used in older versions is now deprecated)
"string"
"array"
"object"
"null" (since PHP 4.2.0)
Example:

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

Output:

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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