How do i get the yaw and pitch from a Vector3?

So i am trying to make an KillAura detection and for that i want to calculate the yaw and pitch needed to look at the Players (x,y,z) coordinate but neither of my atempts are returing the right yaw and pitch.

Here is some of my code:

/* 1st try
$yaw = atan($playerPos[1] / $playerPos[0]);
$pitch = atan(sqrt(pow($playerPos[0], 2) + pow($playerPos[1], 2)) / $playerPos[2]);
*/

/* 2nd try
$dx = $damagerPos[0] - $playerPos[0];
$dy = $damagerPos[1] - $playerPos[1];
$dz = $damagerPos[2] - $playerPos[2];

$pitch = -atan2($dy, sqrt(($dx * $dx) + ($dz * $dz)));
$yaw = atan2($dz, $dx) - 90;
*/

/* 3rd try
$pitch = rad2deg(atan2(-$playerPos[0], $playerPos[2]));
$yaw = rad2deg(-$playerPos[1]);
*/

/* 4th try
$pitch = $damager->pitch * M_PI / 180 * -1;
$yaw = ($damager->yaw + 90) * M_PI / 180;
*/

/* 5th try
$dx = $damagerPos[0] - $playerPos[0];
$dy = $damagerPos[1] - $playerPos[1];
$dz = $damagerPos[2] - $playerPos[2];

$pitch = asin(-$dy);
$yaw = atan2($dx, $dz);
*/

/* 6th try
$delta = $player->subtract($damager);
$pitch = rad2deg(asin($delta->y));
$yaw = rad2deg(atan(-$delta->x / $delta->z));
*/

/* 7th try
$pitch = asin($playerPos[0] / cos(asin($playerPos[1])));
$yaw = asin($playerPos[1]);
*/

/* 8th try
$dx = $damagerPos[0] - $playerPos[0];
$dy = $damagerPos[1] - $playerPos[1];
$dz = $damagerPos[2] - $playerPos[2];

$pitch = atan2(sqrt($dz * $dz + $dx * $dx), $dy) + M_PI;
$yaw = atan2($dz, $dx);
*/

/* 9th try
$pitch = atan(sqrt(pow($playerPos[0], 2) + pow($playerPos[1], 2)) / $playerPos[2]);
$yaw = atan($playerPos[0] / (-$playerPos[1]));
*/

Note: I know that there might be better ways of detecting KillAura but i want to do it this way beacuse i want to learn how i can get the yaw and pitch from a Vector3.

Sorry for my english xD