RETURNS a STRING containing a DECIMAL representation of the given HEXADECIMAL number argument.
<?php
nbr hexdec ( str $hex_string )
where,
$hex_string = The hexadecimal string to convert to decimal
?>
| MAXIMUM HEXADECIMAL VALUE | MAXIMUN DECIMAL VALUE | bit |
| ffffffff | 4294967295 | 32 |
| 7fffffffffffffff | 9223372036854775807 | 64 |
| ed48 | ||
EXERCISE
<?php
$nbr01_32m = 'ffffffff00000002';
$nbr01_32M = 'ffffffff';
$nbr01_64m = '8000000000000002';
$nbr01_64M = '7fffffffffffffff';
$nbr01_e = '5DA';
$hexdec_32m = hexdec($nbr01_32m);
$hexdec_32M = hexdec($nbr01_32M);
$hexdec_64m = hexdec($nbr01_64m);
$hexdec_64M = hexdec($nbr01_64M);
$hexdec_e = hexdec($nbr01_e);
echo 'hexdec( ' . $nbr01_32m . ') =<br>= ' .
$hexdec_32m . '<br><br>';
echo 'hexdec( ' . $nbr01_32M . ') =<br>= ' .
$hexdec_32M . '<br><br>';
echo 'hexdec( ' . $nbr01_64m . ') =<br>= ' .
$hexdec_64m . '<br><br>';
echo 'hexdec( ' . $nbr01_64M . ') =<br>= ' .
$hexdec_64M . '<br><br>';
echo 'hexdec( ' . $nbr01_e . ') =<br>= ' .
$hexdec_e . '<br><br>';
?>
EXERCISE
<?php
var_dump(hexdec("012345"));
echo '<br><br>';
var_dump(hexdec("12345"));
echo '<br><br>';
var_dump(hexdec("q12345"));
echo '<br><br>';
var_dump(hexdec("12345+?!"));
echo '<br><br>';
var_dump(hexdec("12345q"));
echo '<br><br>';
var_dump((float)hexdec("1234500001"));
echo '<br><br>';
var_dump((float)hexdec("17fffffff"));
echo '<br><br>';
?>
EXERCISE
<?php
/*
if (PHP_INT_SIZE != 4)
die("skip this test is for 32bit platform only");
*/
$values = array(0x123abc,
0x789DEF,
0x7FFFFFFF,
0x80000000,
'0x123abc',
'0x789DEF',
'0x7FFFFFFF',
'0x80000000',
'0x123XYZABC',
311015,
'311015',
31101.3,
31.1013e5,
011237,
'011237',
true,
false,
null);
for ($i = 0; $i < count($values); $i++) {
$res = hexdec($values[$i]);
var_dump($res);
echo '<br><br>';
}
?>
EXERCISE
<?php
if (PHP_INT_SIZE != 8)
die("skip this test is for 64bit platform only");
define("MAX_64Bit", 9223372036854775807);
define("MAX_32Bit", 2147483647);
define("MIN_64Bit", -9223372036854775807 - 1);
define("MIN_32Bit", -2147483647 - 1);
$hexLongStrs = array(
'7'.str_repeat('f',15),
str_repeat('f',16),
'7'.str_repeat('f',7),
str_repeat('f',8),
'7'.str_repeat('f',16),
str_repeat('f',18),
'7'.str_repeat('f',8),
str_repeat('f',9)
);
foreach ($hexLongStrs as $strVal) {
echo "Testing: $strVal<br>";
var_dump(hexdec($strVal));
echo '<br><br>';
}
?>
EXERCISE
<?php
if (PHP_INT_SIZE != 8)
die("skip this test is for 64bit platform only");
echo "Testing hexdec() : basic functionality";
$values = array(0x123abc,
0x789DEF,
0x7FFFFFFF,
0x80000000,
'0x123abc',
'0x789DEF',
'0x7FFFFFFF',
'0x80000000',
'0x123XYZABC',
311015,
'311015',
31101.3,
31.1013e5,
011237,
'011237',
true,
false,
null);
foreach($values as $value) {
echo "<br>hexdec $value<br>";
var_dump(hexdec($value));
echo '<br><br>';
};
?>
EXERCISE
<?php
/*
if (PHP_INT_SIZE != 4)
die("skip this test is for 32bit platform only");
*/
echo "Testing hexdec() : usage variations";
//get an unset variable
$unset_var = 10;
unset ($unset_var);
// heredoc string
$heredoc = <<<EOT
abc
xyz
EOT;
// get a resource variable
$fp = fopen(__FILE__, "r");
$inputs = array(
// int data
/*1*/ 0,
1,
12345,
-2345,
4294967295,
// largest decimal
4294967296,
// float data
/*7*/ 10.5,
-10.5,
12.3456789000e10,
12.3456789000E-10,
.5,
// null data
/*12*/ NULL,
null,
// boolean data
/*14*/ true,
false,
TRUE,
FALSE,
// empty data
/*18*/ "",
'',
array(),
// string data
/*21*/ "abcxyz",
'abcxyz',
$heredoc,
// undefined data
/*24*/ @$undefined_var,
// unset data
/*25*/ @$unset_var,
// resource variable
/*26*/ $fp
);
// loop through each element of $inputs
// to check the behaviour of hexdec()
$iterator = 1;
foreach($inputs as $input) {
echo "<br>Iteration: $iterator<br><br>";
try {
var_dump(hexdec($input));
} catch (TypeError $e) {
echo $e->getMessage(), "<br><br>";
}
$iterator++;
};
fclose($fp);
?>
EXERCISE
<?php
if (PHP_INT_SIZE != 8)
die("skip this test is for 64bit platform only");
echo "Testing hexdec() : usage variations";
//get an unset variable
$unset_var = 10;
unset ($unset_var);
// heredoc string
$heredoc = <<<EOT
abc
xyz
EOT;
// get a resource variable
$fp = fopen(__FILE__, "r");
$inputs = array(
// int data
/*1*/ 0,
1,
12345,
-2345,
4294967295,
// largest decimal
4294967296,
// float data
/*7*/ 10.5,
-10.5,
12.3456789000e10,
12.3456789000E-10,
.5,
// null data
/*12*/ NULL,
null,
// boolean data
/*14*/ true,
false,
TRUE,
FALSE,
// empty data
/*18*/ "",
'',
array(),
// string data
/*21*/ "abcxyz",
'abcxyz',
$heredoc,
// undefined data
/*24*/ @$undefined_var,
// unset data
/*25*/ @$unset_var,
// resource variable
/*26*/ $fp
);
// loop through each element of $inputs
// to check the behaviour of hexdec()
$iterator = 1;
foreach($inputs as $input) {
echo "<br><br>Iteration: $iterator<br>";
try {
var_dump(hexdec($input));
echo '<br>';
} catch (TypeError $e) {
echo $e->getMessage(), "<br>";
}
$iterator++;
};
fclose($fp);
?>