php-empty-sucks.php

<?php

/* code below to produce the following output: 

empty([ /*empty*/  ]['k']) === true
empty([ 'k'=>''    ]['k']) === true
empty([ 'k'=>true  ]['k']) === false
empty([ 'k'=>23    ]['k']) === false

// so far, so good. But WTF:

empty([ 'k'=>false ]['k']) === true
empty([ 'k'=>0     ]['k']) === true

23 is not empty but 0 is? a true value is not empty, but false one is? 
*/
  
print "empty([ /*empty*/  ]['k']) === ". (empty([  /*empty*/ ]['k']) ? 'true' : 'false') . PHP_EOL;
print "empty([ 'k'=>''    ]['k']) === ". (empty([ 'k'=>''    ]['k']) ? 'true' : 'false') . PHP_EOL;
print "empty([ 'k'=>true  ]['k']) === ". (empty([ 'k'=>true  ]['k']) ? 'true' : 'false') . PHP_EOL;
print "empty([ 'k'=>23    ]['k']) === ". (empty([ 'k'=>23    ]['k']) ? 'true' : 'false') . PHP_EOL;
                          
print "empty([ 'k'=>false ]['k']) === ". (empty([ 'k'=>false ]['k']) ? 'true' : 'false') . PHP_EOL;
print "empty([ 'k'=>0     ]['k']) === ". (empty([ 'k'=>0     ]['k']) ? 'true' : 'false') . PHP_EOL;