Replace Link Value PHP

preg_replace_callback -> Perform a regular expression search and replace using a callback

<?php
$string = '<a href='http://abc.com'>Title1</a><a href='http://xyz.com'>Title2</a>';
$pattern = '/<s?ashref[s='']+([^'']+)['']>([^<]+)[^>]+>/';
$result = preg_replace_callback($pattern, 'ReplaceLinkValue', $string);

function ReplaceLinkValue($matches)
{
    list($link, $URL, $value) = $matches;
    switch ($URL)
    {
        case 'http://abc.com':
            $newValue = 'New Title1';
            break;

        case 'http://xyz.com':
            $newValue = 'New Title2';
            break;

        default:
            return $link;
    }
    return str_replace($value, $newValue, $link);        
}
echo $string;
?>

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