The role of echo in php

The echo in PHP is used to output information on the screen. Its specific function is as follows: output variable values. Output string. Output HTML code.

The role of echo in PHP

echo in PHP is a language structure used to display messages on the screen Output information.

Detailed explanation of its function

echo is mainly used for the following purposes:

• Output variable value: is used to convert variables The value is displayed on the screen.
• Output string: Used to display text or string.
• Output HTML code: Used to output HTML elements in Web pages.

Grammar

The general syntax of echo is:

<code class="php">echo $variable;
echo "Hello, world!";</code>

where:

• $ variable is the variable to be output.
• "Hello, world!" is the string to be output.

Examples

Here are some examples of echo usage:

<code class="php"><?php
// 输出变量值
$name = "John Doe";
echo $name; // 输出："John Doe"

// 输出字符串
echo "<h1>标题</h1>"; // 输出一个 HTML 标题

// 输出 HTML 代码
echo "<ul>";
echo "<li>项目 1</li>";
echo "<li>项目 2</li>";
echo "</ul>"; // 输出一个无序列表</code>

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