Online PHP editor | output for EkfSn

@ 2016-02-11T11:19:07Z

<?php

echo "int cast: ",-( (int)((2 ** 32) - 0xffffffff));   // -1
echo "int cast: ", (int)(0xffffffff - (2 ** 32));   // -1

printf("\nprintf: %d\n",  -((int) (2 ** 32) -  0xffffffff)); // treat as a signed number -- first gets cast to an int?
echo "hexdec: ";
var_dump((int) hexdec("ffffffff"));
printf("\nprintf max int in hex: %x\n",PHP_INT_MAX);

echo 0x5,"\n";
echo ~0x5 + 1,"\n";  // transform to -5
$n = sprintf("0x%x", (pow(2,32) - 5) );  // get 2s complement
var_dump($n);
$i = intval($n + 0);  // trick that doesn't work anymore with PHP 7
echo $i;
var_dump($i);
printf("%x",$i);      // display binary as hex
$r = 0xffffffff & 0xfffffffb; // anding to simplify
var_dump($r);
echo 0xfb - pow(2,8);    // to detect value of hex
printf("\n%x\n",(pow(2, 32) - 5));
echo (5 + 0xfffffffb) == pow(2,32)? 'true':'false'; // floats both
echo "\n",0xfffffffb > 0x7fffffff? 'true':'false';

Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.25, 8.4.1 - 8.4.12: int cast: -1int cast: -1 printf: -1 hexdec: int(4294967295) printf max int in hex: 7fffffffffffffff 5 -5 string(10) "0xfffffffb" Warning: A non-numeric value encountered in /in/EkfSn on line 15 0int(0) 0int(4294967291) -5 fffffffb true true
Output for 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.31, 7.4.0 - 7.4.33: int cast: -1int cast: -1 printf: -1 hexdec: int(4294967295) printf max int in hex: 7fffffffffffffff 5 -5 string(10) "0xfffffffb" Notice: A non well formed numeric value encountered in /in/EkfSn on line 15 0int(0) 0int(4294967291) -5 fffffffb true true
Output for 7.0.0 - 7.0.33, 7.3.32 - 7.3.33: int cast: -1int cast: -1 printf: -1 hexdec: int(4294967295) printf max int in hex: 7fffffffffffffff 5 -5 string(10) "0xfffffffb" 0int(0) 0int(4294967291) -5 fffffffb true true
Output for 5.6.0 - 5.6.38: int cast: -1int cast: -1 printf: -1 hexdec: int(4294967295) printf max int in hex: 7fffffffffffffff 5 -5 string(10) "0xfffffffb" 4294967291int(4294967291) fffffffbint(4294967291) -5 fffffffb true true
Output for 5.5.0 - 5.5.38: Parse error: syntax error, unexpected '*' in /in/EkfSn on line 3
Process exited with code 255.

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