Find greatest of three values in PHP

Question

With three numbers, $x, $y, and $z, I use the following code to find the greatest and place it in $c. Is there a more efficient way to do this?

$a = $x;
$b = $y;
$c = $z;
if ($x > $z && $y <= $x) {
    $c = $x;
    $a = $z;
} elseif ($y > $z) {
    $c = $y;
    $b = $z;
}

Related: [PHP Type-Juggling and (strict) Greater/Lesser Than Comparisons](http://stackoverflow.com/q/15813490/367456) — hakre, Apr 07 '13 at 10:13

score 30 · Accepted Answer · edited Apr 07 '13 at 10:12

30

Probably the easiest way is $c = max($x, $y, $z). See the documentation on max^Docs for more information, it compares by the integer value of each parameter but will return the original parameter value.

edited Apr 07 '13 at 10:12

hakre

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answered Jul 31 '09 at 00:54

Greg Hewgill

951,095
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1

Old q/a, I know, but as an explanation for why I wasn't aware of max() at the time. – Gordon Mar 17 '17 at 17:23

score 12 · Answer 2 · edited Apr 07 '13 at 10:11

12

You can also use an array with max.

max(array($a, $b, $c));

if you need to

edited Apr 07 '13 at 10:11

hakre

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435
836

answered Jul 31 '09 at 00:56

Tyler Carter

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score 0 · Answer 3 · edited Jul 14 '18 at 02:19

0

<?php
$a=20;
$b=10;
$c=1;
if($a>$b && $a>$c)
{
echo "Greater value is a=".$a;
}
else if($b>$a && $b>$c)
{
echo "Greater value is b=".$b;
}
else if($c>$a && $c>$b)
{
echo "Greater value is c=".$c;
}
else
{
echo"Dont Enter Equal Values";
}
?>

Output:

Greater value is a=20

edited Jul 14 '18 at 02:19

Grant Miller

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answered Jul 14 '18 at 00:53

Ashutosh Verma

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2

score -1 · Answer 4 · answered Jun 16 '21 at 07:39

If you want to Compare Three Variables. Compare two integers and get maximum of them by using max() function. Then compare the maximum with the third variable!

$x = 1; $y = 2; $z = 3;
$maximum = max($x, $y);
$c = max($maximum, $z);
echo $c; //3

Also you could do it just in one line max(max($x, $y), $z).

Find greatest of three values in PHP

4 Answers4