在php中使用带正则表达式的列表

Question

$word = file('list.txt');
$content = file_get_contents('fleetyfleet.txt');

fleetyfleet.txt contains

DimensionNameGreenrandomjunktextextcstuffidonwantDimensionNameBluemoreeecrapidontwannaseeeDimensionNameYellowDimensionNameGrayrandomcrapDimensionNameRed

list.txt contains

Green Blue Yellow

what i want is to be able to find DimensionName then store the word after it into an array if the word is in list.txt

so when script was ran the result stored in array would be Green,Blue,Yellow but not Red and Gray because they are not in our list

Answer 1

The trick is to explode() your file contents by delimiter and then filter results with the words from the list. $matching contains all found fragments matching list.

$words = file_get_contents('list.txt');
$text = file_get_contents('content.txt');

$elements = explode('DimensionName', $text); // trick
$words = explode(' ', $words); // words list

// leverage native PHP function
$matching = array_reduce($elements, function($result, $item) use($words) {
    if(in_array($item, $words)) { $result[] = $item; }
    return $result;
    }, array());

var_dump($matching);

UPDATE

array_reduce() is a neat function, but I totally forgot about a way simpler solution:

$matching = array_intersect($words, $elements);

From the docs:

array_intersect() returns an array containing all the values of array1 that are present in all the arguments. Note that keys are preserved.

So $matching will contain all elements from $words array that are present in $elements. This is the simplest and possibly the best solution here.