<?php
function calculateMedia($numeros){
    foreach ($numeros as $numero);
    if($numero>0){
        $suma = array_sum($numeros);
        $media = ($suma / count($numeros));
        return $media;
    }else{
        return falso;
    }
}
//ejemplo de uso
$numeros = array(-5,-6,10,7,8);
if ($numero>0){
     $suma = array_sum($numeros);
        $media = ($suma / count($numeros));
    echo "La media es $media";
}else{
    echo "No se admiten números negativos";
}

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