1-4

<?php
    /*$var = condition ? true : fasle;*/
    function br(){
        echo "<br/>";
    }

    $var1 = 25;
    $var2 = 45;

    echo "var1 = ".$var1;
    br();
    echo "var2 = ".$var2;
    br();

    $ans = $a == $b ? "a==b":"a!=b";
    br(); echo $ans;
    $ans = $a === $b ? "a===b":"a!==b";
    br(); echo $ans;
    $ans = $a != $b ? "a!=b":"a==b";
    br(); echo $ans;
    $ans = $a <> $b ? "a<>b":"a==b";
    br(); echo $ans;
    $ans = $a !== $b ? "a!==b":"a===b";
    br(); echo $ans;
    $ans = $a < $b ? "a<b":"a>=b";
    br(); echo $ans;
    $ans = $a > $b ? "a>b":"a<=b";
    br(); echo $ans;
    $ans = $a <= $b ? "a<=b":"a>b";
    br(); echo $ans;
    $ans = $a >= $b ? "a>=b":"a<b";
    br(); echo $ans;

?>