Common PHP Constants

README.md

I have files with other sets of constants available

• date
• file-size
• time

They're already part of my skeleton repo.

power-of-two-constants.php

<?php
/**
 * The powers of 2 are common in applications. This file makes it easy
 * to use them, while showing you the values in the phpdoc.
 *
 * @package Constants\Numbers
 */

/**
 * 2^0 = 1
 */
define('TWO_POWER_OF_00', 1);

/**
 * 2^1 = 2
 */
define('TWO_POWER_OF_01', 2);

/**
 * 2^2 = 4
 */
define('TWO_POWER_OF_02', 4);

/**
 * 2^3 = 8
 */
define('TWO_POWER_OF_03', 8);

/**
 * 2^4 = 16
 */
define('TWO_POWER_OF_04', 16);

/**
 * 2^5 = 32
 */
define('TWO_POWER_OF_05', 32);

/**
 * 2^6 = 64
 */
define('TWO_POWER_OF_06', 64);

/**
 * 2^7 = 128
 */
define('TWO_POWER_OF_07', 128);

/**
 * 2^8 = 256
 */
define('TWO_POWER_OF_08', 256);

/**
 * 2^9 = 512
 */
define('TWO_POWER_OF_09', 512);

/**
 * 2^10 = 1,024
 *
 * The number of bytes in a kilobyte
 */
define('TWO_POWER_OF_10', 1024);

/**
 * 2^11 = 2,048
 */
define('TWO_POWER_OF_11', 2048);

/**
 * 2^12 = 4,096
 */
define('TWO_POWER_OF_12', 4096);

/**
 * 2^13 = 8,192
 */
define('TWO_POWER_OF_13', 8192);

/**
 * 2^14 = 16,384
 */
define('TWO_POWER_OF_14', 16384);

/**
 * 2^15 = 32,768
 */
define('TWO_POWER_OF_15', 32768);

/**
 * 2^16 = 65,536
 */
define('TWO_POWER_OF_16', 65536);

/**
 * 2^17 = 131,072
 */
define('TWO_POWER_OF_17', 131072);

/**
 * 2^18 = 262,144
 */
define('TWO_POWER_OF_18', 262144);

/**
 * 2^19 = 524,288
 */
define('TWO_POWER_OF_19', 524288);

/**
 * 2^20 = 1,048,576
 *
 * The number of bytes in a megabyte
 */
define('TWO_POWER_OF_20', 1048576);

/**
 * 2^21 = 2,097,152
 */
define('TWO_POWER_OF_21', 2097152);

/**
 * 2^22 = 4,194,304
 */
define('TWO_POWER_OF_22', 4194304);

/**
 * 2^23 = 8,388,608
 */
define('TWO_POWER_OF_23', 8388608);

/**
 * 2^24 = 16,777,216
 */
define('TWO_POWER_OF_24', 16777216);

/**
 * 2^25 = 33,554,432
 */
define('TWO_POWER_OF_25', 33554432);

/**
 * 2^26 = 67,108,864
 */
define('TWO_POWER_OF_26', 67108864);

/**
 * 2^27 = 134,217,728
 */
define('TWO_POWER_OF_27', 134217728);

/**
 * 2^28 = 268,435,456
 */
define('TWO_POWER_OF_28', 268435456);

/**
 * 2^29 = 536,870,912
 */
define('TWO_POWER_OF_29', 536870912);

/**
 * 2^30 = 1,073,741,824
 *
 * The number of bytes in a gigabyte
 */
define('TWO_POWER_OF_30', 1073741824);

/**
 * 2^31 = 2,147,483,648
 */
define('TWO_POWER_OF_31', 2147483648);

/**
 * 2^32 = 4,294,967,296
 */
define('TWO_POWER_OF_32', 4294967296);

powers.php

<?php
/**
 * Create a formatted table of 2^0 through 2^32 displaying 
 * the power, it's decimal value, and it's binary value.
 */
echo "\n";
echo "=====================================================\n";
echo "                    Powers Of 2\n";
echo "=====================================================\n";
$max = 32;
$decimals = 0;
$decimal_point = '.';
$thousands_sep = ',';
for ($i=0; $i<= 32; $i++){
	$answer = pow(2, $i);
	$formatted = number_format($answer, $decimals, $decimal_point, $thousands_sep);
	printf("%2d %14s = %033b\n", $i, $formatted, $answer);
}

echo "\n";
echo "\n";