dqusbxh44823 2017-04-05 18:50
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PHP IF语句 - 关闭多个条件

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';
}
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2条回答 默认 最新

  • dou47732 2017-04-05 19:00
    关注

    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

    本回答被题主选为最佳回答 , 对您是否有帮助呢?
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