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Try

<?php

    foreach (file("A.txt") as $line) 
    {
        // Split line
        $field = preg_split('/\s+/',$line);

        // This is your array index
        $index = $field[1].' '.$field[2];

        // Array holds name which is first field
        $Array[$index] = $field[0];
    }

    foreach(file("B.txt") as $line)
    {

        // Split field   
        $field = preg_split('/\s+/',$line);

        // 2nd file index
        $index = $field[1].' '.$field[2];

        // if index is set in array echo name else line
        echo (isset($Array[$index])?$Array[$index].' '.$index:$line).'<br>';
    }
?>

Would result for given input

将给出输入的结果

 not 5 2
 Horse 3 2
 not 2 2
 Fish 2 4