PHP: test line length for wrapping

Question

How can I test if a chunk exceeds the image size and wrap that text to the next line. Not sure if I am even doing this correctly with my if statement.

$text="Lorem Ipsum Lorem Ipsum Lorem Ipsum Lorem http://somelongurl.com/then-we-make-it-super-long-with-some-more/ Lorem Ipsum Lorem Ipsum Lorem Ipsum";

$string_chunks = explode(' ', $text);

foreach ($string_chunks as $chunk) {

    if($end_x + $chunk > $image_width){
        $start_x = 5;
        $start_y += 20;
    }

   $coords = imagettfbbox($fontsize, $angle, $font, $chunk);

   $end_x = $coords[0] + $coords[4] + 10;

   $color_to_draw = is_a_url($chunk) ? $linkcolor : $black; 

   imagettftext($im, $fontsize, $angle, $start_x, $start_y, $color_to_draw, $font, $chunk);

   $start_x += $end_x;
}

With this code I get:

Lorem Ipsum Lorem Ipsum Lorem Ipsum Lorem 
http://somelongurl.com/then-we-make-it-super-long-with-some-more/
Lorem Ipsum Lorem Ipsum Lorem Ipsum

What I would like to happen is something like:

Lorem Ipsum Lorem Ipsum Lorem Ipsum 
Lorem http://somelongurl.com/then-we
-make-it-super-long-with-some-more/
Lorem Ipsum Lorem Ipsum Lorem Ipsum

Answer 1

if($end_x + $chunk > $image_width){ 
    $start_x = 5; 
    $start_y += 20; 
} 

One main mistake, $end_x + (strlen($chunk)*$charPXsize) > $image_width Another mistake, what will happen if a row is longer than $image_width? It'll print out on the next line, but will be too long for it anyway.

Answer 2

What I've done is to iterate over the string, checking each time to see if the bounding box gets too wide. Then if it does, insert a new line and continue until you've consumed all of your text. Then write it all as one big string...

$chunks = explode(' ', $text);
$wrappedText = '';
foreach ($chunks as $chunk) {
    $coords = imagettfbbox($fontsize, $angle, $font, $wrappedText.' '.$chunk);
    $width = $coords[2] - $coords[0];
    if ($width > $myMaxWidth) {
        $wrappedText .= "\n" . $chunk;
    } else {
        $wrappedText .= ' ' . $chunk;
    }
}
imagettftext(
    $im, 
    $fontsize, 
    $angle, 
    $start_x, 
    $start_y, 
    $color_to_draw, 
    $font, 
    $wrappedText
);

Now, note that this will not color your links differently... But, you could always add a detection method in there to determine the exact position that the link will be written, and overwrite it with your color if it's there...

Answer 3

Use wordwrap and pass it the fourth parameter, $cut, as true to force the URL to be broken.

Live example.

Answer 4

i guess i know what you want to achieve. i've didn't test the code below, so it could need some polish and re-thing / testing. but it should give you a good startpoint

<?php
$text = "Lorem Ipsum Lorem Ipsum Lorem Ipsum Lorem http://somelongurl.com/then-we-make-it-super-long-with-some-more/ Lorem Ipsum Lorem Ipsum Lorem Ipsum";
$string_chunks = explode(' ', $text);

foreach ($string_chunks as $chunk) {
    $_start_bit = false;
    // before anything else check if chunk is url
    $color_to_draw = is_a_url($chunk) ? $linkcolor : $black; 
    // check if chunk is to long
    if(strlen($chunk) > $image_width) {
        // if there is allredy a word in the current line
        // make the first bit $imagewidth - current line width
        if ($start_x > 5) {
            $_start_bit = substr($chunk, 0, ($image_width - $start_x));
            $chunk = str_replace($_start_bit, "", $chunk);
        }
        $_chunkbits = wordwrap($chunk, $image_width, "\n", true);
        $_chunkbits = explode("\n", $_chunkbits);
        if($_start_bit) {
            array_unshift($_chunkbits, $_start_bit);
        }
        // loop bits and draw them
        foreach ($_chunkbits as $bit) {
            if($end_x + $bit > $image_width){
                $start_x = 5;
                $start_y += 20;
            }
            $coords = imagettfbbox($fontsize, $angle, $font, $bit);
            $end_x = $coords[0] + $coords[4] + 10;
            imagettftext($im, $fontsize, $angle, $start_x, $start_y, $color_to_draw, $font, $bit);
            $start_x += $end_x;
        }
        unset($_chunkbits);
    } else {
        if($end_x + $chunk > $image_width){
            $start_x = 5;
            $start_y += 20;
        }
        $coords = imagettfbbox($fontsize, $angle, $font, $chunk);
        $end_x = $coords[0] + $coords[4] + 10;
        imagettftext($im, $fontsize, $angle, $start_x, $start_y, $color_to_draw, $font, $chunk);
        $start_x += $end_x;
    }
}