Get line number from preg_match_all()

Question

I\'m using PHP\'s preg_match_all() to search a string imported using file_get_contents(). The regex returns matches but I would like to know at which line number those matches a

Answer 1

You can use preg_match_all to find offsets of every linefeed and then compare them against the offsets you already have.

// read file to buffer
$data = file_get_contents($datafile);

// find all linefeeds in buffer    
$reg = preg_match_all("/\n/", $data, $lfall, PREG_OFFSET_CAPTURE );
$lfs = $lfall[0];

// create an array of every offset
$linenum = 1;
$offset = 0;    
foreach( $lfs as $lfrow )
{
    $lfoffset = intval( $lfrow[1] );
    for( ; $offset <= $lfoffset; $offset++ )
        $offsets[$offset] = $linenum;   // offset => linenum
    $linenum++;
}