RETURNS a number as square root of another number.
Compatible with LOCALE only, up to PHP 7.4.XX.
<?php
float sqrt ( float $num )
where,
$num = The argument to extract the square root
?>
EXERCISE
<?php
setlocale(LC_ALL, 'pt-PT', 'pt_PT');
$arg01a = 2;
$arg01b = '2';
$arg01c = M_PI;
echo 'sqrt( ' . $arg01a . ' ) = ' . sqrt($arg01a) . '<br><br>';
echo 'sqrt( ' . $arg01b . ' ) = ' . sqrt($arg01b) . '<br><br>';
echo 'sqrt( ' . $arg01c . ' ) = ' . sqrt($arg01c) . '<br>';
?>
EXERCISE
<?php
setlocale(LC_ALL, 'pt-PT', 'pt_PT');
$arg02 = -M_E;
echo sqrt($arg02);
?>
EXERCISE
<?php
setlocale(LC_ALL, 'pt-PT', 'pt_PT');
echo "Testing sqrt() : usage variations.<br><br><br>";
$values = [ 23,
-23,
2.345e1,
-2.345e1,
0x17,
027,
"23",
"23.45",
"2.345e1",
"1000",
null,
true,
false ];
for ($i = 0; $i < count($values); $i++) {
$res = sqrt($values[$i]);
var_dump($res);
echo '<br><br>';
}
?>
EXERCISE
<?php
setlocale(LC_ALL, 'pt-BR', 'pt_BR');
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);
$longVals = array(
MAX_64Bit, MIN_64Bit, MAX_32Bit,
MIN_32Bit, MAX_64Bit - MAX_32Bit,
MIN_64Bit - MIN_32Bit,
MAX_32Bit + 1, MIN_32Bit - 1,
MAX_32Bit * 2, (MAX_32Bit * 2) + 1,
(MAX_32Bit * 2) - 1,
MAX_64Bit -1, MAX_64Bit + 1,
MIN_64Bit + 1, MIN_64Bit - 1
);
foreach ($longVals as $longVal) {
echo "<br><br>Testing: $longVal<br>";
var_dump(sqrt($longVal));
}
?>