用PHP编写函数 [英] Writing a function in php

问题描述

我正在尝试找出如何编写php函数的方法，这样我就不必一遍又一遍地编写代码块，我正在玩耍并尝试编写此代码，但这不适用于出于某种原因，谁能告诉我我要去哪里错了?.

I am trying to work out how to write php functions, so that I don't have to keep writing a block of code over and over again, I am having a play around and tried writing this, but it doesnt work for some reason, can anyone tell me where I am going wrong ?.

<?php
$greeting 'Hello';

function frank ()
{
$name = 'frank';
$2nd = 'robson';
echo $greeting;
echo $name;
echo $2nd;
}


echo frank()
?>

推荐答案

与其在函数内部回显，不如考虑返回一个字符串.还更喜欢传递参数而不是使用全局范围:

Instead of echoing inside your function you should consider returning a string with it. Also prefer passing a parameter instead of using global scope :

$greeting = 'Hello';

function frank ($funcGreetings)
{
    $name   = 'frank';
    $second = 'robson';
    //Concat variable together an return them
    return $funcGreetings.' '.$name.' '.$second;
}


echo frank($greeting);

最后，变量名以字母或下划线开头，因此$2nd不是有效的名称.
请参阅此此链接以获取有关命名变量的更多信息

Finally a variable name start with a letter or an underscore so $2nd is not a valid name.
See this this link for more info on naming variable

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