Fonction PHP pour spinner du contenu SEO

spin.php

<?php
function spin($txt){
        $pattern = '#\{([^{}]*)\}#msi';
        $test = preg_match_all($pattern, $txt, $out);
        if(!$test)
            return $txt;
 
        $a_trouver = array();
        $a_remplacer = array();
 
        foreach($out[0] as $id => $match)
            {
                $choisir = explode("|", $out[1][$id]);
                $a_trouver[] = $match;
                $a_remplacer[] = $choisir[rand(0, count($choisir)-1)];
            }
        $reponse = str_replace($a_trouver, $a_remplacer, $txt);
 
        return spin($reponse);
}