TCPDF: preg_replace with a function

[interactive]

Hi,

 

I'm using TCPDF to create a PDF from a webpage.

This works great but I have the following problem:

 

I'm building in WordPress and as you may know WP saves images on different sizes. (e.g. 150x150, 300x300 and 1024x1024)

The thing I'm trying to create is that users can download a PDF ready for printing. So High Resolution images.

I use a preg_match_all function to match the image source and remove the additional image size from the filename so the original high resolution image is loaded.

 

e.g. image-150x150.jpg will be replaced by image.jpg.

So now the original image that has a image size of 6024x6024px and 300 DPI is loaded.

Then TCPDF uses a resize function that resizes the image back to 150x150 px but sets the DPI to 300 so it can be printed on a good quality.

 

This all works but now the problem comes:

If I do the preg_match_all function the image gets "pulled" from the rest of the content and looses it's position.

So my thought to fix this was. Get a preg_replace function and replace the image tag with a function that executes the whole image change like described above.

 

This doesn't work......

 

So i'm stuck here. Hope anyone can assist me with this.

Here is what I have done so far.

function execute(){	
	preg_match_all("/<img[^>]+src=(?:\"|\')\K(.[^\">]+?)(?=\"|\')/",$content,$matches,PREG_PATTERN_ORDER);
		for( $i=0; isset($matches[1]) && $i < count($matches[1]); $i++ ) 
		{
			$search = array('-'.$s1.'x'.$s2.'', '-'.$s3.'x'.$s4.'', '-'.$s5.'x'.$s6.'');
			$replace = array('', '', '');
			
			
			$a = $matches[1][$i];
	
			if (strpos($a,'-'.$s1.'x'.$s2.'') !== false) {
				$w = $s1;
				$w = $pdf->pixelsToUnits($w);
				$h = $s2;
				$h = $pdf->pixelsToUnits($h);
				$l = '57';
				$l = $pdf->pixelsToUnits($l);
				$t = '170';
				$t = $pdf->pixelsToUnits($t);
			}elseif (strpos($a,'-'.$s3.'x'.$s4.'') !== false) {
				$w = $s3;
				$w = $pdf->pixelsToUnits($w);
				$h = $s4;
				$h = $pdf->pixelsToUnits($h);
				$l = '217';
				$l = $pdf->pixelsToUnits($l);
				$t = '20';
				$t = $pdf->pixelsToUnits($t);
			}elseif (strpos($a,'-'.$s5.'x'.$s6.'') !== false) {
				$w = $s5;
				$w = $pdf->pixelsToUnits($w);
				$h = $s6;
				$h = $pdf->pixelsToUnits($h);
				$l = '57';
				$l = $pdf->pixelsToUnits($l);
				$t = '310';
				$t = $pdf->pixelsToUnits($t);
			}
			
			$content .= $pdf->Image(str_replace($search,$replace,$matches[1][$i]), $l, $t, $w, $h, 'JPG', '', '', true, 300, '', false, false, 0, false, false, false);
		}
	};			

global $post;
$id = $_GET['id'];
$content_post = get_post($id);// get the content
$content = $content_post->post_content;
$content = apply_filters('the_content', $content);
$content = str_replace(']]>', ']]>', $content);

$content = preg_replace('/<img[^>]+./e',execute(), $content); // replace the image tag with the new image

// EXPORT IT ALL
$pdf->writeHTML($content, true, false, true, false, '');

[requinix]

Just like with every other place in code, if you say "execute()" then PHP is going to execute the function. Immediately.

 

You want preg_replace_callback. Check the examples on how to use it properly.

[interactive]

Call me stupid but I just don't see it.

I used the preg_replace_callback but there is no image show:

 $content = preg_replace_callback('/<img[^>]+./',
        function () {
           preg_match_all("/<img[^>]+src=(?:\"|\')\K(.[^\">]+?)(?=\"|\')/",$content,$matches,PREG_PATTERN_ORDER);
				for( $i=0; isset($matches[1]) && $i < count($matches[1]); $i++ ) 
				{
					$search = array('-'.$s1.'x'.$s2.'', '-'.$s3.'x'.$s4.'', '-'.$s5.'x'.$s6.'');
					$replace = array('', '', '');
					
					
					$a = $matches[1][$i];
			
					if (strpos($a,'-'.$s1.'x'.$s2.'') !== false) {
						$w = $s1;
						$w = $pdf->pixelsToUnits($w);
						$h = $s2;
						$h = $pdf->pixelsToUnits($h);
						$l = '57';
						$l = $pdf->pixelsToUnits($l);
						$t = '170';
						$t = $pdf->pixelsToUnits($t);
					}elseif (strpos($a,'-'.$s3.'x'.$s4.'') !== false) {
						$w = $s3;
						$w = $pdf->pixelsToUnits($w);
						$h = $s4;
						$h = $pdf->pixelsToUnits($h);
						$l = '217';
						$l = $pdf->pixelsToUnits($l);
						$t = '20';
						$t = $pdf->pixelsToUnits($t);
					}elseif (strpos($a,'-'.$s5.'x'.$s6.'') !== false) {
						$w = $s5;
						$w = $pdf->pixelsToUnits($w);
						$h = $s6;
						$h = $pdf->pixelsToUnits($h);
						$l = '57';
						$l = $pdf->pixelsToUnits($l);
						$t = '310';
						$t = $pdf->pixelsToUnits($t);
					}
					
					$content .= $pdf->Image(str_replace($search,$replace,$matches[1][$i]), $l, $t, $w, $h, 'JPG', '', '', true, 300, '', false, false, 0, false, false, false);
				}	
        },
        $content
    );