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"PHP Basics" use of integer data

2022-07-27 08:10:00 【Go home at night】

Functional requirements

Output binary respectively 、 octal 、 Decimal and hexadecimal integers .

The sample code 

<!doctype html>

<html>

<head>

<meta charset="utf-8">

<title> Output results of different base numbers </title>

</head>



<body>

<?php

    $n1 = 123;  #  Decimal number 

    $n2 = 0;  #  zero 

    $n3 = -123; #  negative 

    $n4  = 0123;  #  Octal number （ Equal to a decimal number 83）

    $n5 = 0x1b;  #  Hexadecimal number （ Equal to a decimal number 27）

    $n6 = 0b1010; #  Binary number （ Equal to a decimal number 10）

    echo ' Decimal number ：'.$n1.'<br>';

    echo ' zero ：'.$n2.'<br>';

    echo ' Negative decimal number ：'.$n3.'<br>';

    echo ' Octal number ：'.$n4.'<br>';

    echo ' Hexadecimal number ：'.$n5.'<br>';

    echo ' Binary number ：'.$n6.'<br>';

?>

</body>

Running results

 

 

Knowledge description

Integer data types can only contain integers . Integer numbers can be in decimal 、 Octal and hexadecimal , Optional symbols can be added to the front （- or +）.

Binary expression integer since PHP5.4.0 Available from .

If you want to use octal expression , The number must be preceded by 0（ zero ）; If you want to use hexadecimal expression , Then the number needs to be preceded by 0x; To use binary representation , The number must be called before 0b.

Be careful ： If there are non digits in octal （8 and 9）, There is a mistake

Be careful ： If the given value exceeds int The maximum range that type can represent , Will be treated as float Type treatment , This situation is called integer overflow . Again , If the final result of the expression exceeds int The range of the type , And will return to float type .

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