Auto new-line by dimensions - php

Question

Today I want to make a function that parses the text into lines, guided by imageTTFBbox(). I created this piece of code but it's limited to 2 lines. I want to make the same, but in infinite lines. Thanks for your help! :D
function printe($image, $image_width, $string, $font_size, $y, $color, $font){
$font = "fonts/" . $font . ".ttf";
$limit = $image_width - 20;
$tsize = #imageTTFBbox($font_size,0, $font, $string);
$twidth = abs($tsize[4] - $tsize[0]);
$words = explode(" ", $string);
$text = ''; $text1 = '';$a = 0;$o = 0;
for($i = 0; $i < count($words); $i++){
$tsize = #imageTTFBbox($font_size,0, $font, $words[$i]." ");
$twidth = abs($tsize[4] - $tsize[0]);
$nw = $twidth + $a;
if($nw > $limit OR $o > 0){
$o++;
$text1 .= $words[$i]." ";
}else{
$text .= $words[$i]. " ";
$a =$a+$twidth;
}
}
$txtcolor = processColor($color);
$t1size = #imageTTFBbox($font_size,0, $font, $text);
$t1width = abs($t1size[4] - $t1size[0]);
$t2size = #imageTTFBbox($font_size, 0, $font, $text1);
$t2width = abs($t2size[4] - $t2size[0]);
$center = ceil($image_width / 2);
$y1 = $y; $y2 = $y;
$xcord1 = ($image_width/2)-($t1width/2)+3;
$xcord2 = ($image_width/2)-($t2width/2)+3;
$y2 = $y + ($font_size * 1.5);
imagettftext($image, $font_size, 0, $xcord1, $y1, $txtcolor, $font, $text);
imagettftext($image, $font_size, 0, $xcord2, $y2, $txtcolor, $font, $text1);
}

Answer 1

Even if not fully tested, I wrote this code starting from an example found on the PHP manual:
<?php
function write_multiline_text($image, $font_size, $color, $font, $text, $start_x, $start_y, $max_width) {
//split the string
//build new string word for word
//check everytime you add a word if string still fits
//otherwise, remove last word, post current string and start fresh on a new line
$words = explode(" ", $text);
$string = "";
$tmp_string = "";
for($i = 0; $i < count($words); $i++) {
$tmp_string .= $words[$i]." ";
//check size of string
$dim = imagettfbbox($font_size, 0, $font, $tmp_string);
if($dim[4] < ($max_width - $start_x)) {
$string = $tmp_string;
$curr_width = $dim[4];
} else {
$i--;
$tmp_string = "";
$start_xx = $start_x + round(($max_width - $curr_width - $start_x) / 2);
imagettftext($image, $font_size, 0, $start_xx, $start_y, $color, $font, $string);
$string = "";
$start_y += abs($dim[5]) * 2;
$curr_width = 0;
}
}
$start_xx = $start_x + round(($max_width - $dim[4] - $start_x) / 2);
imagettftext($image, $font_size, 0, $start_xx, $start_y, $color, $font, $string);
}
// Create a 300x300 image
$im = imagecreatetruecolor(300, 300);
$black = imagecolorallocate($im, 0, 0, 0);
$white = imagecolorallocate($im, 255, 255, 255);
// Set the background to be white
imagefilledrectangle($im, 1, 1, 298, 298, $white);
// Path to our font file
$font = 'c:/windows/fonts/arial.ttf';
$text = "This is a very ";
$text .= "long long long long long long long long long long long long long long long long ";
$text .= "long long long long long long long long long long long long long long long long ";
$text .= "line of text";
write_multiline_text($im, 12, $black, $font, $text, 10, 22, 298);
// Output to browser
header('Content-Type: image/png');
imagepng($im);
imagedestroy($im);
?>
And here is the resulting output image:
If you don't want the text to be centered, you must substitute the variable $start_xx with $start_x in the two calls to the function imagettftext.