Estoy usando php para generar texto enriquecido. ¿Cómo puedo eliminar completamente los estilos en línea?

El texto se pegará directamente desde MS Word u OpenOffice y se utilizará en TinyMCE, un editor de texto enriquecido que le permite agregar formato HTML básico al texto. Sin embargo, quiero eliminar los estilos en línea en el

etiquetas (ver abajo), pero preservar el

se etiquetan

<p style="margin-bottom: 0cm;">A patrol of Zograth apes came round the corner, causing Rosette to pull Rufus into a small alcove, where she pressed her body against his. &ldquo;Sorry.&rdquo; She said, breathing warm air onto the shy man's neck. Rufus trembled.</p>
<p style="margin-bottom: 0cm;">&nbsp;</p>
<p style="margin-bottom: 0cm;">Rosette checked the coast was clear and pulled Rufus out of their hidey hole. They watched as the Zograth walked down a corridor, almost out of sight and then collapsed next to a phallic fountain. As their bodies hit the ground, their guns clattered across the floor. Rosette stopped one with her heel and picked it up immediately, tossing the other one to Rufus. &ldquo;Most of these apes seem to be dying, but you might need this, just to give them a helping hand.&rdquo;</p>