PHP：在行内添加If条件

Question

    if($i==6) {
    $result .= '<a style="display:none" class="fancybox" data-fancybox-group="gallery" href="'.$value['images']['standard_resolution']['url'].'"></a> '.$caption.PHP_EOL;;}
    else {
    $result .= "\t".'<a class="fancybox" data-fancybox-group="gallery" href="'.$value['images']['standard_resolution']['url'].'"><img id="thumb'.++$i.'" src="'.$value['images']['low_resolution']['url'].'" alt="'.$value['caption']['text'].'" width="'.$width.'" height="'.$height.'" /></a> '.$caption.PHP_EOL;}

This means: for all the items greater than 6 $result is display:none and blahblah, for all the others $result is images with caption.

What I'd like to add is: if counter is EQUAL to 4, print the "else" $result with the ONLY change that instead of src="'.$value['images']['low_resolution']['url'].'", it would be src="'.$value['images']['thumb_resolution']['url'].'"

I think that this would work, but I'm looking for a cooler, one-liner way :D

    if($i==6) {
    $result .= '<a style="display:none" class="fancybox" data-fancybox-group="gallery" href="'.$value['images']['standard_resolution']['url'].'"></a> '.$caption.PHP_EOL;;}
    elseif($i===4) {
    $result .= "\t".'<a class="fancybox" data-fancybox-group="gallery" href="'.$value['images']['standard_resolution']['url'].'"><img id="thumb'.++$i.'" src="'.$value['images']['thumb_resolution']['url'].'" alt="'.$value['caption']['text'].'" width="'.$width.'" height="'.$height.'" /></a> '.$caption.PHP_EOL;}
    else {
    $result .= "\t".'<a class="fancybox" data-fancybox-group="gallery" href="'.$value['images']['standard_resolution']['url'].'"><img id="thumb'.++$i.'" src="'.$value['images']['low_resolution']['url'].'" alt="'.$value['caption']['text'].'" width="'.$width.'" height="'.$height.'" /></a> '.$caption.PHP_EOL;}

Answer 1

Look up the conditional operator, or ternary operator. It is used like this:

$check = true;
$var = $check ? 5 : 3;

The conditional operator checks the value of the expression before the ? and outputs either the value before the : if the expression is true or the value after the ':' if it is false. So the line above sets $var to 5 because $check is true. You could also have done this:

$check = 2354;
$var = ($check < 40) ? 5 : 3;

That would have given you the opposite result, $var would have been set to 3, because $check did not meet the condition $check < 40. Think of it like a function which outputs one of two possible values based on the truth value of a given expression. You can embed that directly into the result .= as:

($i === 4) ? $value['images']['low_resolution']['url'] : $value['images']['thumb_resolution']['url'];

For more information about the conditional operator, you can look at the PHP documentation page about it here. Note that the part about the conditional operator is a little way down the page.