假设我有以下数组$books(实际数组更大)：
Array
(
[0] => The mystic Masseur
[1] => The Suffrage of Elvira
[2] => Miguel Street
[3] => A House for Mr Biswas
[4] => Mr Stone and the Knights Companion
[5] => The Mimic Men
[6] => A Flag on the Island
[7] => In a Free State
[8] => Guerrillas
[9] => A Bend in the River
[10] => The Enigma of Arrival
[11] => A Way in the World
[12] => Half a Life
[13] => Magic Seeds
)
当我使用sort函数时,结果如下：
Array
(
[0] => A Bend in the River
[1] => A Flag on the Island
[2] => A House for Mr Biswas
[3] => A Way in the World
[4] => Guerrillas
[5] => Half a Life
[6] => In a Free State
[7] => Magic Seeds
[8] => Miguel Street
[9] => Mr Stone and the Knights Companion
[10] => The Enigma of Arrival
[11] => The Mimic Men
[12] => The mystic Masseur
[13] => The Suffrage of Elvira
)
但我想在开头忽略文章(a,an,the),并希望得到这样的结果：
Array
(
[0] => A Bend in the River
[1] => The Enigma of Arrival
[2] => A Flag on the Island
[3] => Guerrillas
[4] => Half a Life
[5] => A House for Mr Biswas
[6] => In a Free State
[7] => Magic Seeds
[8] => Miguel Street
[9] => The Mimic Men
[10] => Mr Stone and the Knights Companion
[11] => The mystic Masseur
[12] => The Suffrage of Elvira
[13] => A Way in the World
)
我试过了：
$_books = array();
foreach($books as $book){
if(substr($book,4) == "The "){
$_books[substr($book,4)] = $book;
}
else if(substr($book,3) == "An "){
$_books[substr($book,3)] = $book;
}
else if(substr($book,2) == "A "){
$_books[substr($book,2)] = $book;
}
else{
$_books[$book] = $book;
}
}
ksort($_books);
$books = array_values($_books);
但我知道这不是最好的解决方案,因为它有丢失价值的风险(例如,如果输入中同时存在“A Fantasy”和“The Fantasy”,则输出中只会出现“The Fantasy”).那么,什么是最好的解决方案？
使用自定义排序功能：
function handleArticles($str) {
list($first,$rest) = explode(" ",$str." ",2);
// the extra space is to prevent "undefined offset" notices
// on single-word titles
$validarticles = array("a","an","the");
if( in_array(strtolower($first),$validarticles)) return $rest.",".$first;
return $str;
}
usort($books,function($a,$b) {
return strnatcasecmp(handleArticles($a),handleArticles($b));
});