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if(isset($_request("enviar"))
{

php

}

<form>
<input type "SUBMIT" name="enviar"...>
</form>

<style>
.submit{display:none;}
</style>

<script src="jquery.js"></script>
<script>
$(document).ready(function() {
$('#Envia').click(function() {
$('.submit').click();
});
});
</script>

<form id="formulario" action="teste.php" method="post">
<input type="text" name="nome" value="João" />
<input type="button" id="Envia" value="Enviar" />
<input type="submit" name="Enviar" class="submit">
</form>

<?php
if(isset($_POST['Enviar'])) {
echo $_POST['nome'];
}
?>