使用数组根据拥有的键查找所需值
$ceshi = 'epub';
if ($ceshi === 'pdf') {
$type = 'book';
} else if ($ceshi === 'epub') {
$type = 'book';
} else if ($ceshi === 'license') {
$type = 'license';
} else if ($ceshi === 'artwork') {
$type = 'creative';
} else if ($ceshi === 'song') {
$type = 'creative';
} else if ($ceshi === 'physical') {
$type = 'physical';
}
dd($type);
$ceshi = 'epub';
$type = [
'pdf' => 'book',
'epub' => 'book',
'license' => 'license',
'artwork' => 'creative',
'song' => 'creative',
'physical' => 'physical',
][$ceshi];
dd($type);