45 lines
829 B
Markdown
45 lines
829 B
Markdown
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---
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title: Functions
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localeTitle: 功能
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---
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## PHP函数简介
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函数是可以在程序中重复使用的语句块。
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### 简单的功能+通话
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```php
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function say_hello() {
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return "Hello!";
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}
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echo say_hello();
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```
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### 简单功能+参数+调用
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```php
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function say_hello($friend) {
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return "Hello " . $friend . "!";
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}
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echo say_hello('Tommy');
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```
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### strtoupper - 让所有的Chars变得更大和更大！
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```php
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function makeItBIG($a_lot_of_names) {
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foreach($a_lot_of_names as $the_simpsons) {
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$BIG[] = strtoupper($the_simpsons);
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}
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return $BIG;
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}
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$a_lot_of_names = ['Homer', 'Marge', 'Bart', 'Maggy', 'Lisa'];
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var_dump(makeItBIG($a_lot_of_names));
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```
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#### 更多信息：
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* [php.net用户定义的函数手册](https://secure.php.net/manual/en/functions.user-defined.php)
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