php - 数字对具有混合类型值的数组进行排序

Question

我有一个这样的混合数组:

$fruits = array(
    "lemon",
    "Lemon",
    20,
    "banana",
    "apple",
    "121",
    40,
    50
);

然后对其应用 sort() 函数，如下所示:

sort($fruits, SORT_NUMERIC);
foreach ($fruits as $key => $val) {
    echo "fruits[" . $key . "] = " . $val . "\n";
}

现在，我不明白输出是:

fruits[0] = apple
fruits[1] = lemon
fruits[2] = banana
fruits[3] = Lemon
fruits[4] = 20
fruits[5] = 40
fruits[6] = 50
fruits[7] = 121

请解释为什么这样排序？

Answer 1

OP，自sort();大写和小写字符不太适用，为什么不将所有内容都转换为小写然后排序？

<?php
$fruits = array("lemon","Lemon", 20, "banana", "apple","121",40,50);
$fruits = array_map("strtolower", $fruits); //using strtolower

sort($fruits );
foreach ($fruits as $key => $val) {
    echo "fruits[" . $key . "] = " . $val . "\n";
}
?>

输出

fruits[0] = 20
fruits[1] = 40
fruits[2] = 50
fruits[3] = 121
fruits[4] = apple
fruits[5] = banana
fruits[6] = lemon
fruits[7] = lemon