$result = array();
$fping=array(
'FPing1'=>$x1,
'FPing3'=>$x3,
'FPing5'=>$x5,
'FPing10'=>$x10,
'FPing30'=>$x30,
'FPing60'=>$x60,
'FPing120'=>$x120,
'FPing180'=>$x180,
'FPing300'=>$x300);
if(array_key_exists($probe_name,$fping)){
$result[] = $fping[$probe_name];
}
or
$result = array();
$fping=array(
'FPing1'=>$x1,
'FPing3'=>$x3,
'FPing5'=>$x5,
'FPing10'=>$x10,
'FPing30'=>$x30,
'FPing60'=>$x60,
'FPing120'=>$x120,
'FPing180'=>$x180,
'FPing300'=>$x300);
foreach ( $fping as $key => $value ) {
if ( $key == $probe_name ) {
$result[] = $value;
}
}