Get a few rows from a textarea and remove lines that don't contain a comma

[Notreallybrad]

What I want to achieve:

 

1. User pastes around ~50 rows of data into a textarea which looks something like this:

aosijpoaspo4koas4
aso4kaps4kaso4pas
4asp4sak,as4aposk4paos
paosk4poas,asas4as4aspkoå4as
as4kopasap sk4poask45 4k4 4 

4 rkop43kr p4

¤p 43kpo4 kp¤PO k4 
4pw ok4
,4ok po4w ,
 4opkrpo4rp4o

2. I want to remove all lines that does NOT contain a comma, this should be fairly easy by first exploding the string with \n as separator and make it become and array (which I have done in my code)

 

3. Then I want to print out all the lines which has a comma.

 

I am stuck here and my head spins a lot because of all this thinking. Does it mean I am stupid? This is very hard for me.

 

 

First problem is that I can't check the length of an array with strlen so that's where I am currently stuck...

                                                if(isset($_POST['usernames'])) {
					  	
						  	$str = $_POST['usernames'];

						  	//Explode $str to an array, each line separated by line breaks \n
							$arr = explode("\n", $str);


							//If row contains "," add it to an array and print it
							for ($x = 0; $x < strlen($arr); $x++) {
								if (preg_match('/,/',$arr[$x])) {
									    echo $arr[$x] . "<br>";
								}
							}
													
							    					
					  
						}

Yep I got a spelling error in the title but I can't change it...

Edited September 9, 2016 by Notreallybrad

[Jacques1]

Um, what? Where does this bizarre input come from? Why do some rows have commas and others not?

[cyberRobot]

To loop through the array, you could use a foreach loop:

http://php.net/manual/en/control-structures.foreach.php

 

That way you wouldn't need to worry about a counter. But if you need the counter, for whatever reason, you could use the count() function.

http://php.net/manual/en/function.count.php

 

To determine if a line contains a comma, you could avoid regular expressions by using strpos() instead.

http://php.net/manual/en/function.strpos.php

 

Note that you'll want to read the warning under the Return Values section.

[requinix]

Yep I got a spelling error in the title but I can't change it...

But I can!

[cyberRobot]

Basically, you could do something like this

//Explode $str to an array, each line separated by line breaks \n
$arr = explode("\n", $str);
$values_withCommas = array();
 
//If row contains "," add it to an array and print it
foreach ($arr as $currLine) {
    if (strpos($currLine, ',') !== false) {
        $values_withCommas[] = $currLine;
    }
}
 
//Display result
echo implode('<br>', $values_withCommas);