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Code
<?php
// 128 in different notations
$a = 128; 			// decimal number
var_dump($a);

$a = -128; 			// a negative number
var_dump($a);

$a = 0x80; 			// hexadecimal number
var_dump($a);

$a = 0200; 			// octal number
var_dump($a);

$a = 0b10000000;	// binary number
var_dump($a);
Result