How to use PHP functions to perform base conversion

In the previous article "PHP function application to return the day before and the day after a certain date", we introduced the use of strtotime() function to obtain the day before and the day after a given date. , the date of the previous month and the next month, the date of the week and the next week, etc. Interested friends can learn about it~

The focus of this article is " hexadecimal conversion", Introduce the mutual conversion of binary numbers and decimal numbers, the mutual conversion of decimal numbers and hexadecimal numbers, and the mutual conversion of decimal numbers and octal numbers.

Conversion between binary numbers and decimal numbers

##1. Convert binary numbers to decimal numbers

bindec(binary string) function, which can convert binary numbers into decimal numbers.

<?php
echo bindec("0011") . "<br>";
echo bindec("01") . "<br>";
echo bindec("11000110011") . "<br>";
echo bindec("111");
?>

3
1
1587
7

base_convert (number or string to be converted, original base, base to be converted) function , it can convert between any bases, just set "base_convert(binary string, 2, 10)"

<?php
echo base_convert("0011",2,10) . "<br>";
echo base_convert("01",2,10) . "<br>";
echo base_convert("11000110011",2,10) . "<br>";
echo base_convert("111",2,10);
?>

2. Convert decimal numbers to binary numbers

decbin(decimal value) function, which can convert decimal numbers is a binary number.

<?php
echo decbin("3") . "<br>";
echo decbin("1") . "<br>";
echo decbin("1587") . "<br>";
echo decbin("7");
?>

11
1
11000110011
111

base_convert(decimal value, 10, 2)".

<?php
echo base_convert("3",10,2) . "<br>";
echo base_convert("1",10,2) . "<br>";
echo base_convert("1587",10,2) . "<br>";
echo base_convert("7",10,2);
?>

Conversion between decimal and octal numbers

1. Convert octal number to decimal number

octdec(octal string) function, which can convert octal number to decimal number.

<?php
echo octdec("36") . "<br>";
echo octdec("12") . "<br>";
echo octdec("3063") . "<br>";
echo octdec("106");
?>

30
10
1587
70

base_convert(octal string, 8, 10)".

<?php
echo base_convert("36", 8, 10) . "<br>";
echo base_convert("12", 8, 10) . "<br>";
echo base_convert("3063", 8, 10) . "<br>";
echo base_convert("106", 8, 10);
?>

2. Convert decimal number to octal number

decoct (decimal value) Function that converts a decimal number to an octal number.

<?php
echo decoct("30") . "<br>";
echo decoct("10") . "<br>";
echo decoct("1587") . "<br>";
echo decoct("70");
?>

36
12
3063
106

base_convert(decimal value, 10, 8)".

<?php
echo base_convert("30", 10, 8) . "<br>";
echo base_convert("10", 10, 8) . "<br>";
echo base_convert("1587", 10, 8) . "<br>";
echo base_convert("70", 10, 8);
?>

Conversion between decimal numbers and hexadecimal numbers

1. Convert hexadecimal number to decimal number

hexdec(hexadecimal string) function, which can convert hexadecimal number to decimal number. Convert a base number to a decimal number.

<?php
echo hexdec("1e") . "<br>";
echo hexdec("a") . "<br>";
echo hexdec("11ff") . "<br>";
echo hexdec("cceeff");
?>

30
10
4607
13430527

base_convert(hexadecimal string, 16, 10)" that is Can.

<?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);
?>

2. Convert decimal number to hexadecimal number

dechex(decimal value) Function, which converts decimal numbers to hexadecimal numbers.

<?php
echo dechex("30") . "<br>";
echo dechex("10") . "<br>";
echo dechex("1587") . "<br>";
echo dechex("70");
?>

1e
a
633
46

base_convert(decimal value, 10, 16)".

<?php
echo base_convert("30", 10, 16) . "<br>";
echo base_convert("10", 10, 16) . "<br>";
echo base_convert("1587", 10, 16) . "<br>";
echo base_convert("70", 10, 16);
?>

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