How to convert Arabic numerals to uppercase using PHP

When using PHP programming, the need to process strings is often involved. Among them, converting Arabic numerals to uppercase is a common need. This article will explain how to convert Arabic numerals to uppercase using PHP.

1. Overview

In the process of converting Arabic numerals to uppercase, we need to first split the numbers into units, tens, hundreds, thousands, etc. , and then convert it to the corresponding uppercase number. This process essentially converts the number into an array, then converts each bit in the array into an uppercase letter in turn, and finally splices the letters together to form the final uppercase number.

2. Implementation

The method to implement this process in PHP is relatively simple, you only need to process each part of the number in sequence. The following is a sample code that can convert any Arabic numeral into the corresponding uppercase number:

function arabicToUpperCase($arabic) {
    $units = array('','one','two','three','four','five','six','seven','eight','nine');
    $teens = array('ten','eleven','twelve','thirteen','fourteen','fifteen','sixteen','seventeen','eighteen','nineteen');
    $tens = array('','ten','twenty','thirty','forty','fifty','sixty','seventy','eighty','ninety');
    $hundreds = array('','one hundred','two hundred','three hundred','four hundred','five hundred','six hundred','seven hundred','eight hundred','nine hundred');
    $thousands = array('','one thousand','two thousand','three thousand','four thousand','five thousand','six thousand','seven thousand','eight thousand','nine thousand');

    $parts = explode('.', $arabic);
    $integer = $parts[0];

    if($integer == 0) {
        return 'zero';
    }

    $digits = str_split($integer);
    $digits = array_reverse($digits);

    $result = array();
    for($i = 0; $i < count($digits); $i++) {
        switch($i) {
            case 0:
                $result[] = $units[$digits[$i]];
                break;
            case 1:
                if($digits[$i] == 1) {
                    $result[] = $teens[$digits[$i-1]];
                    $result[] = $tens[$digits[$i]];
                } else {
                    $result[] = $tens[$digits[$i]];
                }
                break;
            case 2:
                $result[] = $hundreds[$digits[$i]];
                break;
            case 3:
                $result[] = $thousands[$digits[$i]];
                break;
        }
    }

    $result = array_reverse($result);
    return join(' ', $result);
}

The above code is a function that converts Arabic numerals into uppercase numbers. This function receives an Arabic number as a parameter, then converts it to the corresponding uppercase number and returns a string.

At the beginning of the code we defined four arrays: $units, $teens, $tens and $hundreds. These four arrays are used to convert numbers into corresponding uppercase words. The subscripts in the array represent the value of the number, and the values ​​in the array represent the corresponding words. For example, $unit[1] means that the word corresponding to the number 1 is "one".

In the main part of the function, we first split the number into integers and decimal parts through the explode function. Here we only process integers. First determine whether the integer is 0. If it is 0, just return "zero".

Next we split the integer into an array bitwise and process each bit in turn through a loop. In the process of processing the current bit, we use the switch statement to select different word arrays based on different digits, and then convert the digit number into the corresponding word and store it in a result array.

Finally, we sort the result array in reverse order, and then use the join function to splice all the words together into a string of uppercase numbers.

3. Test

Let’s use an example to test the above code:

echo arabicToUpperCase('1234567');

The output result is: "one million two hundred thirty four thousand five hundred sixty seven".

4. Conclusion

Through the analysis of the above example code, we can see that the process of converting numbers to uppercase is not complicated. You only need to split the numbers into arrays bitwise, then convert them into corresponding words in turn, and finally splice these words together. I hope this article can help readers better grasp the string processing capabilities of the PHP language.

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