Php和javascript数组 - 跳过空白值并添加到新数组？

Question

I have an array in php that contains all the lines of a text files (each line being one value of the array). My text file had blank lines so the array has blank lines too. I wanted to search the array for a certain value like this:

$array = array();

        $lines = file("textfile.txt"); //file in to an array
        foreach ($lines as $line)
        {
            if (stripos($line, "$$") !== false) 
            {
                $array[] = str_replace("$$", "", $line);

            }
        }

The code above is searching for a $$ and replacing it with a blank. The text file holds a line with a $$1 or any number and I want it to find all instances of that line, which it is doing.

My problem is that I want it to find the next 5 lines that aren't blank after finding the $$(number) and put them into a multi dimensional array. The multidimensional array looking similar to this (the program is a test in case you are wondering why the array is named the way it is):

$test = array(
    array('question' => 'What is the answer', 'ansa' => "answera", 'ansb' => "answerb", 'ansc' => "answerc", 'ansd' => "answerd"), // $test[1]
    array('question' => 'What is the answer', 'ansa' => "answera", 'ansb' => "answerb", 'ansc' => "answerc", 'ansd' => "answerd"), // $test[2]
);

The next five lines after the $$(number) are a question and four answers that need to go into the array. My code with regxp and searching isn't working so i discarded it.

Answer 1

you can try something like this...

<?php

$lines = array_filter(file('text.txt')); //file in to an array
$questions = array();

// find your starts and pull out questions
foreach ($lines as $k=>$line)
{
    if (stripos($line, "$$") !== false) 
    {
        $questions[] =  array_slice($lines, $k, 5);
    }
}


// dump
var_dump($questions);

See php manual for array_slice