<?php
 
// The array containing all tags
$tags = [
    'Tag3,Tag10,Tag2',
    'Tag1,Tag3,Tag10',
    'Tag5,Tag1,Tag3',
    'Tag8,Tag4,Tag20',
    'Tag20,Tag100,Tag500',
    'Tag1,Tag2,Tag3' // MATCH
];
 
$products = array();
$search = ['Tag1', 'Tag2', 'Tag3'];
$taglist = array_map(function ($v) { return explode(',', $v); }, $tags);
 
foreach ($taglist as $sub) {
    if (count(array_intersect($sub, $search)) == count($search)) {
        $products[] = implode(',', $sub);
    }
}
 
print_r($products);

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