How to sort array by pinyin in php

In PHP programming, we often need to sort arrays. Usually, PHP will have problems sorting Chinese strings because Chinese strings are not arranged in alphabetical order. Therefore, when processing Chinese strings, we need to convert the strings, convert the Chinese strings into Pinyin, and then sort them. So, how does PHP sort the array by pinyin? Let’s introduce it in detail below.

1. Preparation:

In PHP, we can use the pinyin extension to convert Chinese strings into Pinyin. First, you need to install the pinyin extension, which can be installed through the following command:

pecl install pinyin

After the installation is completed, add the following content to the php.ini file:

extension=pinyin.so

Then restart the PHP service to use pinyin expanded.

2. Array sorting:

Suppose we have an array containing several Chinese strings. Now we need to sort this array according to the pinyin order of Chinese strings. We can use the usort function provided by PHP, which accepts two parameters: a sorted array and a sorted callback function.

First, we need to write a callback function. This function will accept two parameters $a and $b, representing the two elements that need to be compared. The function needs to return an integer value representing the size relationship between $a and $b. Returns an integer greater than 0 if $a is greater than $b; returns an integer less than 0 if $a is less than $b; returns 0 if $a is equal to $b. The following is an example:

function cmp($a, $b)
{
    $py_a = pinyin($a); // 转换成拼音
    $py_b = pinyin($b);
    return strcmp($py_a, $py_b); // 比较拼音
}

In the above code, we first use the pinyin function to convert the Chinese string into Pinyin, and then use the strcmp function to compare the size relationship of Pinyin.

Next, we can use the usort function to sort the array, as shown below:

$array = array("张三", "李四", "王五", "赵六");
usort($array, "cmp"); // 按拼音排序
print_r($array); // 输出结果

In the above code, we first define an array $array containing several Chinese strings, Then use the usort function to sort the array. The sorting callback function is the cmp function we defined above. Finally, we use the print_r function to output the sorted results.

3. Summary

By converting Chinese strings into Pinyin, we can easily sort the array. PHP provides the pinyin extension to convert Chinese strings to Pinyin. By using the callback function in conjunction with the usort function, the array can be sorted according to Pinyin. This has great practical value in PHP program development.

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