注意：未定义的偏移量：0在PHP中使用Array

When I'm executing this code-

public $speaker_list=array();

for($i=0;$i<$nbre_speaker;$i++)
{
     $speaker_list[$i]=new Speaker($_POST['speaker'+$i],$_POST['pro_speaker'+$i],$_POST['bio_speaker'+$i]);
}

I'm getting the error:

Notice: Undefined offset: 0

Notice: Undefined offset: 1

Assuming $nbre_speaker is set to something sensible outside the code you provided.

Try this

public $speaker_list = array();

for($i=0; $i < $nbre_speaker; $i++)
{
     if ( isset($_POST['speaker'.$i], $_POST['pro_speaker'.$i], $_POST['bio_speaker'.$i] )) {
         $speaker_list[$i] = new Speaker($_POST['speaker'.$i], 
                                         $_POST['pro_speaker'.$i], 
                                         $_POST['bio_speaker'.$i]);
     } else {
        // report error, or do something to fix it.
     }

}