打印2个功能之间是否有空格？

Question

Im trying to echo the returned value of 2 functions with a space in between, I've tried:

class="<?php echo strtolower($class).' '.is_array($arr) ? 'yes' : 'no'; ?>"

But the above doesn't output anything. Where am I going wrong?

Answer 1

Your code says "is the concatenation of strtolower(…) , ' ' and a boolean truthy?" And since that's always so, it should always be outputting yes . This can best be avoided by not using concatenation but passing separate arguments to echo :

echo strtolower($class), ' ', is_array($arr) ? 'yes' : 'no';

Now the last ternary expression is unrelated to the previous two.

Answer 2

只需将三元部分分组即可。

echo strtolower($class).' '.(is_array($arr) ? 'yes' : 'no');

Answer 3

<?php echo strtolower('someText').' '.(is_array([]) ? 'yes' : 'no'); ?>

结果： sometext是

Answer 4

Use this:

class="<?php echo strtolower($class); ?> <?php is_array($arr) ? echo 'yes' : echo 'no'; ?>"

You print out the result of a function (which is TRUE or FALSE). In this way you output a String Yes or No.

Answer 5

I think you have to put

class="<?php echo strtolower($class).' '.(is_array($arr) ? 'yes' : 'no'); ?>"

Note the "()" around is_array