46 lines
986 B
Markdown
46 lines
986 B
Markdown
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---
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title: Echo and Print
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localeTitle: 回声和打印
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---
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## 回声和打印
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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。
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### 回声
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`echo()`函数将变量或参数的值写出到屏幕。
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```PHP
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<?php
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echo "freeCodeCamp";
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```
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注意：打开PHP标记和回显的简便方法是<？=
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```
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<?= "freeCodeCamp"; ?>
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```
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### 打印
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`print()`函数输出屏幕变量或参数的值。
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```PHP
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<?php
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print "freeCodeCamp";
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```
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### 的print\_r
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`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。
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```PHP
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<?php
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$freecodecamp = "freeCodeCamp";
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print_r($freecodecamp);
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```
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#### 更多信息：
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* [php.net echo（）手册](https://secure.php.net/manual/en/function.echo.php)
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* [php.net print（）手册](https://secure.php.net/manual/en/function.print.php)
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* [php.net print\_r（）手册](https://secure.php.net/manual/en/function.print-r.php)
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