PHP - variables don't change value when they should

Question

I'm having and issue with 2 of my variables in my code. I have an if statement that rests inside a for loop. When the if statement executes in the for loop, my two variables should change accordingly, but they don't. I have no functions in my code, so all the variables are in the global scope.

Here is my code:

$file = file("../../manpages/structure.txt");
$topicindex = 0;
$topiclineindex = 0;
for($x = 0; count($file) > $x; $x++){
    $data = explode(",",$file[$x]);
    $structure[$topicindex][$topiclineindex] = $file[$x];
    echo '[' . $topicindex . ',' . $topiclineindex . ']';
    $topiclineindex += 1;
    if ($data[0] == "ENDTOPIC") {
        echo "NEXT TOPIC";
        $topicindex += 1;
        $topiclineindex = 0;
    }
}
print_r($structure);

This is the output in the browser:

[0,0][0,1][0,2][0,3][0,4][0,5][0,6][0,7]NEXT TOPICArray ( [0] => Array ( [0] => TOPIC,Topic 1 [1] => SUBTOPIC,Sub Topic 1,intro.txt [2] => SUBTOPIC,Sub Topic 2,intro.txt [3] => ENDTOPIC [4] => TOPIC,Topic 2 [5] => SUBTOPIC,Sub Topic 21,intro.txt [6] => SUBTOPIC,Sub Topic 22,intro.txt [7] => ENDTOPIC ) )

And this is the contents of structure.txt

TOPIC,Topic 1
SUBTOPIC,Sub Topic 1,intro.txt
SUBTOPIC,Sub Topic 2,intro.txt
ENDTOPIC
TOPIC,Topic 2
SUBTOPIC,Sub Topic 21,intro.txt
SUBTOPIC,Sub Topic 22,intro.txt
ENDTOPIC

Any and all suggestions are very much appreciated.

EDIT: I've been testing some more, and it seems the newly assigned values don't escape the if statement. On the next iteration of the for loop, $topicindex and $topiclineindex returned to their previous values of the previous iteration before the if statement was excecuted.

AndreiDMS · Accepted Answer · 2017-03-23 23:30:30Z

1

Your IF statement is executed only for the last line because the first ENDTOPIC is actually "ENDTOPIC\n". See http://php.net/manual/en/function.file.php for details about the new line flag

answered Mar 23, 2017 at 23:30

AndreiDMS

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1 Comment

Pulse Designs Over a year ago

You are right. I forgot about the newline character. Thank you so much.

Ilyich · Accepted Answer · 2017-03-23 23:44:37Z

0

Replace

if ($data[0] == "ENDTOPIC") {

with

if (trim($data[0]) == "ENDTOPIC") {

This will do the trick. Your IF statement is executed only for the last line because the first ENDTOPIC is actually "ENDTOPIC\n"

trim() function strips "\n"

answered Mar 23, 2017 at 23:44

Ilyich

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