Reverse array and output formatted text using PHP

To reverse a PHP array and format the text, you can use the following steps: Use the array_reverse() function to reverse the order of the array elements. Use the printf() or sprintf() function to specify the output format and alignment, and to insert variables. Put the reversed array into the printf() or sprintf() function, format it and output it.

Reverse an array in PHP and output formatted text

There are a series of built-in functions available in PHP that can be used to easily handle arrays, including reverse they. This article will explore how to reverse an array using PHP and demonstrate how to use it with formatted text through a practical example.

Reverse Array

To reverse a PHP array, you can use the array_reverse() function. This function will rearrange the elements in the array in reverse order and return a new array. For example:

$originalArray = [1, 2, 3, 4, 5];
$reversedArray = array_reverse($originalArray);

print_r($reversedArray); // 输出： [5, 4, 3, 2, 1]

Format text

To format text, you can use the printf() or sprintf() function. These functions allow you to control the format and alignment of the output and include placeholders for inserting variables. For example:

$name = "John Doe";
printf("欢迎， %s！\n", $name); // 输出： 欢迎， John Doe！

Practical example: Reverse and convert a word list to uppercase

Let's combine this and create a small script that reverses and converts a word list to uppercase.

$wordList = ["hello", "world", "from", "PHP"];

// 反转单词列表
$reversedList = array_reverse($wordList);

// 格式化并输出反转的单词列表
printf("反转后的单词列表：\n");
foreach ($reversedList as $word) {
    printf("- %s\n", strtoupper($word));
}

This script will reverse the list of words and output them item by item in uppercase:

反转后的单词列表：
- PHP
- FROM
- WORLD
- HELLO

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