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Three numbers x, y and z are given and the smallest number among these three numbers can be found out using below methods.

Method 1: Using If statement

In the below example, only if conditional statements are used.

<?php
function smallest($x, $y, $z) {
  $min = $x;
  if ($x <= $y && $x <= $z)
    {$min = $x;}
  if ($y <= $x && $y <= $z)
    {$min = $y;}
  if ($z <= $x && $z <= $y)
    {$min = $z;}
  echo "Smallest number among $x, $y and $z is: $min\n";
}

smallest(100, 50, 25);
smallest(50, 50, 25);
?>

The above code will give the following output:

Smallest number among 100, 50 and 25 is: 25
Smallest number among 50, 50 and 25 is: 25

Method 2: Using If-else statement

It can also be solved using If-else conditional statements.

<?php
function smallest($x, $y, $z) {
  $min = $x;

  if ($x <= $y && $x <= $z)
    $min = $x;
  elseif ($y <= $x && $y <= $z)
    $min = $y;
  else 
    $min = $z;

  echo "Smallest number among $x, $y and $z is: $min\n";
}

smallest(100, 50, 25);
smallest(50, 50, 25);
?>

The above code will give the following output:

Smallest number among 100 , 50 and 25 is:  25
Smallest number among 50 , 50 and 25 is:  25

Method 3: Using Nested If-else statement

The above problem can also be solved using nested if-else conditional statements.

<?php
function smallest($x, $y, $z) {
  $min = $x;
  if ($x <= $y) {
    if($x <= $z) 
      $min = $x;
    else
      $min = $z;
  }
  else {
    if($y <= $z) 
      $min = $y;
    else
      $min = $z;
  }
  echo "Smallest number among $x, $y and $z is: $min\n";
}

smallest(100, 50, 25);
smallest(50, 50, 25);
?>

The above code will give the following output:

Smallest number among 100 , 50 and 25 is:  25
Smallest number among 50 , 50 and 25 is:  25

Method 4: Using ternary operator

The ternary operator can also be used here.

<?php
function smallest($x, $y, $z) {
  $min = $x;
  $min = ($x < $y)? (($x < $z)? $x : $z) : (($y < $z)? $y : $z);
  echo "Smallest number among $x, $y and $z is: $min\n";
}

smallest(100, 50, 25);
smallest(50, 50, 25);
?>

The above code will give the following output:

Smallest number among 100 , 50 and 25 is:  25
Smallest number among 50 , 50 and 25 is:  25