Commonly used output statements and their meanings in php

There are 4 common output statements in PHP: echo: output one or more values, separated by spaces. print: can only output one value. printf: You can format the output and use placeholders to specify the variable insertion position. var_dump: Outputs the value of a variable in a readable format, showing type, value, and structure.

Commonly used output statements in PHP

There are several commonly used output statements in PHP used on web pages Display information:

1. echo

echo is the most basic output statement. It can output one or more values ​​separated by spaces.

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

2. print

print is similar to echo, but can only output one value.

<code class="php">print "Hello, world!";</code>

3. printf

printf can format the output. It takes a format string and one or more variables as arguments. The format string uses placeholders to specify where the variable should be inserted.

<code class="php">$name = "John Doe";
printf("Hello, %s!", $name);
// 输出：Hello, John Doe!</code>

4. var_dump

var_dump Outputs the value of a variable in a readable manner, displaying the type, value and structure of the variable.

<code class="php">$array = [1, 2, 3];
var_dump($array);
// 输出：
// array(3) {
//   [0]=>
//   int(1)
//   [1]=>
//   int(2)
//   [2]=>
//   int(3)
// }</code>

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