PHP IF语句 - 关闭多个条件

Question

It seems inefficient to me to write multiple conditions to do the same action,,, for example

if ( (condition_one || (condition_two && condition_three) )
{
    // Do this ...
}
elseif ( condition_two && condition_three)
{
    // Do same as before ...
}
else
{
    // Do that ...
}

Would there be a valid approach to accomplishing this? Where condition_two and condition_three have to be executed together but separately from condition_one...

if ( (condition_one || (condition_two && condition_three) )
{
    // Do this ...
}
else
{
    // Do that ...
}

In other words,,, is there some way, that I am unaware of, to do this:

if ( ( $a < $b || ( $a <= $b && $c = $d ) )
{
    echo 'foo';
}
else
{
    echo 'bar';
}  

Rather than this:

if ( ( $a < $b )
{
    echo 'foo';
}
elseif ( $a <= $b && $c = $d )
{
    echo 'foo';
}
else
{
    echo 'bar';
}

Answer 1

You can test this easy but you had an extra paren

<?php

function testNest($a, $b, $c, $d){
    if ($a < $b || ( $a <= $b && $c = $d )) {
        echo 'foo';
    } else {
        echo 'bar';
    }
}


testNest(3, 2, 3, 2); //bar
testNest(1, 2, 3, 2); //foo

function testElif($a, $b, $c, $d){
    if ($a < $b ){
        echo 'foo';
    } elseif ( $a <= $b && $c = $d ) {
        echo 'foo';
    } else {
        echo 'bar';
    }
}

testElif(3, 2, 3, 2); //bar
testElif(1, 2, 3, 2); //foo

I'll let you come up with more examples but there really is no need for elseif