使用preg_match从帖子中检索和显示图像

Question

Basically this piece of code grab the first image of the post and display it at another page. If no images, it will show the default image.

How do I modify it to make it display max up to 4 images ?

<?php

$Imagesrc = C('Plugin.IndexPostImage.Image','/images/default.png');

preg_match(
    '#\<img.+?src="([^"]*).+?\>#s', 
    $Sender->EventArguments['Post']->Body, 
    $images
);

if ($images[1]) {
    $Imagesrc = $images[1];
}

$thumbs ='<a class="IndexImg" href="'. 
    $Sender->EventArguments['Post']->Url .'">'. 
    Img($Imagesrc, array('title'=>$sline,'class'=>"IndexImg")).'</a>';

echo "$thumbs";

Answer 1

Your found images in array $images according to to preg_match manual:

int preg_match ( string $pattern , string $subject [, array &$matches [, int $flags = 0 [, int $offset = 0 ]]] )

$matches[1] will have the text that matched the first captured parenthesized subpattern, and so on.

So you should iterate over $images array from 1 to 5 and if $images[$i] not empty add this image to your thumbs. Try something like this:

<?php

$Imagesrc = C('Plugin.IndexPostImage.Image','/images/default.png');

preg_match(
    '#\<img.+?src="([^"]*).+?\>#s',
    $Sender->EventArguments['Post']->Body,
    $images
);

$thumbs = "";
for ($i = 1; $i <= 5; $i) {
    if(!empty($images[$i])) {
        $thumbs .= '<a class="IndexImg" href="' .
            $Sender->EventArguments['Post']->Url . '">' .
            Img($images[$i], array('title' => $sline, 'class' => "IndexImg")) . '</a>';
    } else {
        break;
    }
}

echo "$thumbs";