$names = [
	"Mehmet Akif Gökçe",
	"Ali Kaya",
	"Elif Gizem Adıgüzel",
];

function nameFormatOne($name){
	$i = explode(' ', $name);
	$lastName = $i[count($i) - 1];
	unset($i[count($i) - 1]);
	$out = '';
	foreach($i as $x => $y){
		$out .= substr($y, 0, 1).'.';
		if($x < count($i) - 1){
			$out .= ' ';
		}
	}
	$out .= ' '.$lastName;
	echo $out;
}
function nameFormatTwo($name){
	$i = explode(' ', $name);
	$lastName = $i[count($i) - 1];
	unset($i[count($i) - 1]);
	$out = $lastName.', ';
	foreach($i as $x => $y){
		$out .= $y;
		if($x < count($i) - 1){
			$out .= ' ';
		}
	}
	echo $out;
}
function nameFormatThree($name){
	$i = explode(' ', $name);
	$lastName = $i[count($i) - 1];
	unset($i[count($i) - 1]);
	$out = $lastName.', ';
	foreach($i as $x => $y){
		$out .= substr($y, 0, 1).'.';
		if($x < count($i) - 1){
			$out .= ' ';
		}
	}
	echo $out;
}

function nameFormatFour($name){
	$i = explode(' ', $name);
	$lastName = $i[count($i) - 1];
	unset($i[count($i) - 1]);
	$out = $lastName.' ';
	foreach($i as $x => $y){
		$out .= $y;
		if($x < count($i) - 1){
			$out .= ' ';
		}
	}
	echo $out;
}
echo "<pre>";
foreach($names as $n){
	nameFormatOne($n);
	echo " | Format 1<br/>";
	nameFormatTwo($n);
	echo " | Format 2<br/>";
	nameFormatThree($n);
	echo " | Format 3<br/>";
	nameFormatFour($n);
	echo " | Format 3<br/>";
}
echo "</pre>";
/**
M. A. Gökçe | Format 1
Gökçe, Mehmet Akif | Format 2
Gökçe, M. A. | Format 3
Gökçe Mehmet Akif | Format 4
A. Kaya | Format 1
Kaya, Ali | Format 2
Kaya, A. | Format 3
Kaya Ali | Format 4
E. G. Adıgüzel | Format 1
Adıgüzel, Elif Gizem | Format 2
Adıgüzel, E. G. | Format 3
Adıgüzel Elif Gizem | Format 4
*/