Try this
<?php
$yourArray = array(
'0' => 'Samy Jeremiah,55',
'1' => 'Nelson Owen,93',
'2' => 'McMaster Ashlie,88',
'3' => 'Marsh Harlow,97',
'4' => 'Macfarquhar Aiden,95',
'5' => 'Lowe Sophie,91',
);
#Check output 01
//print_r($yourArray);
foreach ($yourArray as $value) {
$explodeValue = explode( ',', $value );
$newName []= array($explodeValue[0] => $explodeValue[1]);
}
#Check output 02
//print_r($newName);
#Check output 03
echo(json_encode($newName));
?>
PHPFiddle Preview
Output 01
Array (
[0] => Samy Jeremiah,55
[1] => Nelson Owen,93
[2] => McMaster Ashlie,88
[3] => Marsh Harlow,97
[4] => Macfarquhar Aiden,95
[5] => Lowe Sophie,91
)
Output 02
Array (
[0] => Array ( [Samy Jeremiah] => 55 )
[1] => Array ( [Nelson Owen] => 93 )
[2] => Array ( [McMaster Ashlie] => 88 )
[3] => Array ( [Marsh Harlow] => 97 )
[4] => Array ( [Macfarquhar Aiden] => 95 )
[5] => Array ( [Lowe Sophie] => 91 )
)
Output 03
[
{"Samy Jeremiah":"55"},
{"Nelson Owen":"93"},
{"McMaster Ashlie":"88"},
{"Marsh Harlow":"97"},
{"Macfarquhar Aiden":"95"},
{"Lowe Sophie":"91"}
]