get random geo location points within a radius

gistfile1.php

<?php

function getLocation( $y0, $x0, $rad ) {
	$rad = $rad / 111195.0;
		echo '$rad: '.$rad."\n";

	$u = (float)mt_rand() / (float)getrandmax();
	$v = (float)mt_rand() / (float)getrandmax();
		echo 'rand: '.$v.' '.$u."\n";
		
	$w = $rad * sqrt( $u );
		echo '$w: '.$w."\n";
		
	$t = 2 * pi() * $v;
		echo '$t: '.$t."\n";
	
	$y = $w * sin( $t );
		echo '$y: '.$w."\n";
		
	$x = $w * cos( $t );
		echo '$x: '.$w."\n";
		
	$new_x = $x / cos( $y0 );
		echo '$new_x: '.$new_x."\n";
	
	return [ 
		'y' => number_format( ( $y + $y0 ), 7 ), 
		'x' => number_format( ( $new_x + $x0 ), 7 )
	];
}

$x = getLocation( 19.9449799, 50.0646501, 12000 );
echo '50.0646501 19.9449799'."\n";
echo $x['x'].' '.$x['y'];

?>