Sondaki Veriyi Silme

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Arkadaşlar, Mesela üsteki embed kodları, x değişkenine eşit olsun. Bu x değişkeninde en son kullanılmış, <!--nextpage--> kodunu nasıl silebilirim ?

// kodları embed değişkenine topla
$hede =explode('<br />', rtrim($embed,'<!--nextpage-->'));
print_r($hede);

$x = str_replace('<!--nextpage-->', '', $x);