What are the functions for converting numeric values ​​in php?

The conversion functions include: 1. intval(), which can convert a string into an integer value, the syntax is "intval($str)"; 2. floatval(), which can convert a string into a floating point Type value, syntax "floatval($str)"; 3. settype(), you can set the variable to an integer or floating point value, syntax "settype($str,"integer")" or "settype($str,"float ")"; 4. base_convert().

The operating environment of this tutorial: windows7 system, PHP8 version, DELL G3 computer

1. intval() function--integer Type conversion function

intval() function is used to obtain the integer value of a variable.

intval() function returns the integer value of variable var by using the specified base conversion (default is decimal). intval() cannot be used with object, otherwise an E_NOTICE error will be generated and 1 will be returned.

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

2. floatval() function--floating point conversion function

floatval — Get the floating point value of a variable

Example:

<?php   
$str="3.14";   
$float=floatval($str);   
var_dump($str); 
var_dump($float); 
?>

3. settype() function

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

Description:

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

settype ( $var ,$type )

$type Settable values:

• "boolean" (or "bool", starting from PHP 4.2.0)

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

• "float" (only available since PHP 4.2.0, For "double" used in older versions now deprecated)

• "string"

• "array"

• "object"

• ##"null" (from PHP 4.2.0 onwards)

4. Use the base_convert() function

bindec(hex string, 16, 10)" to convert hexadecimal numbers into decimal numbers.

<?php
echo base_convert("1e", 16, 10) . "<br>";
echo base_convert("a", 16, 10) . "<br>";
echo base_convert("11ff", 16, 10) . "<br>";
echo base_convert("cceeff", 16, 10);
?>

base_convert(number,frombase,tobase);

• number Required. Specifies the number to be converted.​

• #frombase Required. Specifies the original base of the number. Between 2 and 36 (inclusive). Numbers above decimal are represented by the letters a-z, such as a for 10, b for 11, and z for 35.​

• #tobase Required. Specifies the base to be converted. Between 2 and 36 (inclusive). Numbers above decimal are represented by the letters a-z, such as a for 10, b for 11, and z for 35.

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