PHP实现英文数字单词字符串排序程序的技术需求

Got it, let's build a PHP program that takes a string of English number words, sorts them (ascending or descending), and outputs the sorted words back. Here's how to do it properly:

Step 1: Create a Number-Word Mapping #

First, we need a way to convert between English words and their numeric values. We'll use an associative array for this—easy to look up and reverse later.

// Mapping of English number words to their numeric values
$numberWords = [
    'one' => 1,
    'two' => 2,
    'three' => 3,
    'four' => 4,
    'five' => 5,
    'six' => 6,
    'seven' => 7,
    'eight' => 8,
    'nine' => 9,
    'ten' => 10,
    // Add more numbers here if you need to handle larger values
];

// Reverse the mapping to convert numbers back to words
$numericToWords = array_flip($numberWords);

Step 2: Handle Input and Clean Up #

Next, we'll take the input string, split it into individual words, and clean up any extra whitespace (in case the user adds spaces after commas like five, two, seven).

// Example input (you can replace this with user input via $_POST/$_GET or CLI)
$input = "five,two,seven,ten,four";

// Split input into array and trim whitespace from each element
$inputWords = array_map('trim', explode(',', $input));

Step 3: Convert Words to Numbers #

Now we'll convert each word in our input array to its corresponding numeric value. We'll also add a check to skip any invalid words (in case the input has typos or unrecognized terms).

$numericValues = [];
foreach ($inputWords as $word) {
    // Only process words that exist in our mapping
    if (isset($numberWords[strtolower($word)])) {
        $numericValues[] = $numberWords[strtolower($word)];
    }
}

Step 4: Sort the Values #

Choose either ascending or descending sort. We'll show both options here:

// Ascending sort (smallest to largest)
sort($numericValues);

// OR Descending sort (largest to smallest)
// rsort($numericValues);

Step 5: Convert Back to Words and Output #

Finally, we'll convert the sorted numbers back to English words and join them into a comma-separated string.

$sortedWords = [];
foreach ($numericValues as $number) {
    $sortedWords[] = $numericToWords[$number];
}

// Join into a string and output
$output = implode(',', $sortedWords);
echo $output;

Full Working Example #

Putting it all together, here's the complete code that works with your sample input:

<?php
$numberWords = [
    'one' => 1,
    'two' => 2,
    'three' => 3,
    'four' => 4,
    'five' => 5,
    'six' => 6,
    'seven' => 7,
    'eight' => 8,
    'nine' => 9,
    'ten' => 10,
];
$numericToWords = array_flip($numberWords);

$input = "five,two,seven,ten,four";
$inputWords = array_map('trim', explode(',', $input));

$numericValues = [];
foreach ($inputWords as $word) {
    if (isset($numberWords[strtolower($word)])) {
        $numericValues[] = $numberWords[strtolower($word)];
    }
}

// Use sort() for ascending, rsort() for descending
sort($numericValues);

$sortedWords = [];
foreach ($numericValues as $number) {
    $sortedWords[] = $numericToWords[$number];
}

echo implode(',', $sortedWords); // Output: two,four,five,seven,ten
?>

Notes #

• Case Insensitivity: The code uses strtolower() so it handles inputs like Five, TWO correctly.
• Invalid Input Handling: Any unrecognized words are skipped—you can modify this to throw an error or notify the user if needed.
• Scalability: Just add more entries to the $numberWords array if you need to handle numbers beyond ten (like eleven, twelve, etc.).

内容的提问来源于stack exchange，提问作者Arbab Khan