Fnd specific place in string and get data from it

问题

I have string with multiple image tags in it. Like this

<img src="/files/028ou2p5g/blogs/9d66329f4/5844644f69fe7-64.jpg">

I want to find FIRST such tag, and get image name from it 5844644f69fe7-64.jpg How can be this done in PHP asuming there is a lot of other text and tags in string ?

回答1:

You should use like what @moopet suggested. This is the code, but please give credit to @moopet.

$str = '<img src="/files/028ou2p5g/blogs/9d66329f4/5844644f69fe7-64.jpg">';

$doc = new DOMDocument();
$doc->loadHTML($str);

$first_img = $doc->getElementsByTagName("img")[0];
var_dump( basename($first_img->getAttribute('src')) );

回答2:

Don't use regex for this. Use PHP's DOM parser or an alternative to extract the tags, then use PHP's basename() function on the src element to extract the filename.

回答3:

Use preg_match_all() to find all occurences and then get the first one.

Example:

<?php
preg_match_all('/<\s*img[^<>]+?src\s*=\s*[\'\"][^<>\'\"]+?\/([^<>\'\"\/]\.jpg)/', $html, $matches, PREG_SET_ORDER); 
var_dump($matches[0]); 
?>

来源：https://stackoverflow.com/questions/41036804/fnd-specific-place-in-string-and-get-data-from-it