如何获得两个子串之间的子串？

Question

I want to extract a substring between two substrings. The problem is that it will extract only the first one. I want to do it in all of my document.

Example :

function getBetween($content,$start,$end){
    $r = explode($start, $content);
    if (isset($r[1])){
        $r = explode($end, $r[1]);
        return $r[0];
    }
    return '';
}

$document = '<a data-id="777777"></a><a data-id="888888"></a><a data-id="99999"></a>';
$content = $document;
$start = '<a data-id="';
$end = '"';
$data = getBetween($content,$start,$end);
echo $data;

$document2 = '<a data-A="AAAAAA"></a><a data-A="BBBBBB"></a><a data-A="CCCCCC"></a>';
$content = $document2;
$start = '<a data-A="';
$end = '"';
$data2 = getBetween($content,$start,$end);
echo $data2;

Now it's extracting only 777777 AAAAA. But what I want is 777777 AAAAAA 888888 BBBBBB 999999 CCCCC

Answer 1

Just use preg_match_all function.

Example:

<?php
$document = '<a data-id="777777"></a><a data-id="888888"></a><a data-id="99999"></a>';
$document2 = '<a data-A="AAAAAA"></a><a data-A="BBBBBB"></a><a data-A="CCCCCC"></a>';

$list1 = [];
$list2 = [];
preg_match_all('/<a data-id="([^"]+)"/', $document, $list1);
preg_match_all('/<a data-A="([^"]+)"/', $document2, $list2);
print_r([$list1, $list2]);