46 lines
986 B
Markdown
46 lines
986 B
Markdown
---
|
||
title: Echo and Print
|
||
localeTitle: 回声和打印
|
||
---
|
||
## 回声和打印
|
||
|
||
echo和print函数提供了一种将变量或参数的值写出到屏幕的方法。
|
||
|
||
### 回声
|
||
|
||
`echo()`函数将变量或参数的值写出到屏幕。
|
||
|
||
```PHP
|
||
<?php
|
||
echo "freeCodeCamp";
|
||
```
|
||
|
||
注意：打开PHP标记和回显的简便方法是<？=
|
||
```
|
||
<?= "freeCodeCamp"; ?>
|
||
```
|
||
|
||
### 打印
|
||
|
||
`print()`函数输出屏幕变量或参数的值。
|
||
|
||
```PHP
|
||
<?php
|
||
print "freeCodeCamp";
|
||
```
|
||
|
||
### 的print\_r
|
||
|
||
`print_r()`函数将任何变量（例如数组）或参数的值写出到屏幕上，这与回声或打印功能相比更为有限。
|
||
|
||
```PHP
|
||
<?php
|
||
$freecodecamp = "freeCodeCamp";
|
||
print_r($freecodecamp);
|
||
```
|
||
|
||
#### 更多信息：
|
||
|
||
* [php.net echo（）手册](https://secure.php.net/manual/en/function.echo.php)
|
||
* [php.net print（）手册](https://secure.php.net/manual/en/function.print.php)
|
||
* [php.net print\_r（）手册](https://secure.php.net/manual/en/function.print-r.php) |