$movies = array(...); foreach ($movies as $movie) { if ($movie['box_office_gross'] < 5000000) { $flops[] = $movie; } }
$movies = array(...); function flops($movie) { return ($movie['box_office_gross'] < 5000000) ? 1 : 0; } $flops = array_filter($movies, 'flops');
The foreach
loops are simple; you scroll through
the data and append elements to the return array that match your
criteria.
If you want only the first such element, exit the loop using
break
:
foreach ($movies as $movie) { if ($movie['box_office_gross'] > 200000000) { $blockbuster = $movie; break; } }
You can also return directly from a function:
function blockbuster($movies) { foreach ($movies as $movie) { if ($movie['box_office_gross'] > 200000000) { return $movie; } } }
With array_filter( )
,
however, you first create a callback function that returns
true
for values you want to keep and
false
for values you don’t. Using
array_filter( )
, you then instruct PHP to process
the array as you do in the foreach
.
It’s impossible to bail out early from
array_filter( )
, so foreach
provides more flexibility and is simpler to understand. Also,
it’s one of the few cases in which the built-in PHP
function doesn’t clearly outperform user-level code.
Documentation on array_filter( )
at
http://www.php.net/array-filter.
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