freeCodeCamp/guide/chinese/php/functions/index.md

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Functions 功能

PHP函数简介

函数是可以在程序中重复使用的语句块。

简单的功能+通话

function say_hello() { 
  return "Hello!"; 
 } 
 
 echo say_hello(); 

简单功能+参数+调用

function say_hello($friend) { 
  return "Hello " . $friend . "!"; 
 } 
 
 echo say_hello('Tommy'); 

strtoupper - 让所有的Chars变得更大和更大

function makeItBIG($a_lot_of_names) { 
  foreach($a_lot_of_names as $the_simpsons) { 
    $BIG[] = strtoupper($the_simpsons); 
  } 
  return $BIG; 
 } 
 
 $a_lot_of_names = ['Homer', 'Marge', 'Bart', 'Maggy', 'Lisa']; 
 var_dump(makeItBIG($a_lot_of_names)); 

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