PHP能不能实现这样的函数代码?
<code> function a($b){ 代码...... 这里面有一个给数组赋值的代码..... } a('b') = 'c'; ?> </code>
回复内容:
<code> function a($b){ 代码...... 这里面有一个给数组赋值的代码..... } a('b') = 'c'; ?> </code>
简单而言是不能的。
会报错:Fatal error: Can't use function return value in write context in /in/R5ZEN on line 10
代码和运行结果参见这里:http://3v4l.org/R5ZEN
看了下评论,LZ似乎是不想a('b','c')
这样写。其实是有另外一种类似的方法来解决这个问题的 —— ArrayAccess
.
比如Yii
框架中的CCache
就实现了ArrayAccess
,以前设置缓存只能$cache->set('some-key', $someValue)
,现在就可以用$cache['some-key'] = $someValue
,多方便。具体代码参考这里:http://phpcrossref.com/xref/yii/framework/caching/CCache.php.html#offs...
可以使用PHP来解析这段自定义语法.
其实题主的意思就是: 将a方法中的变量b的值修改为c
这样就很容易了, 使用正则或者自己写语法分析(题主需要的话再补)
解析的结果为:
<code>#! /usr/bin/env php <?php function a($arr){ if($arr[0] == 'b'){ $b = $arr[1]; print $b; } } # 使用此方法解析自定义的语法, 伪代码需要再补 function exec_str($str){ $func = 'a'; $b = array('b', 'c'); $func($b); } # 自定义代码 $str = "a('b') = 'c'"; # 执行自定义代码 exec_str($str); </code></code>
试试 call_user_func 能满足要求不?
http://php.net/manual/zh/function.call-user-func.php
<code>function a ($b) { if ($b == 'b') { return 'c'; } } var_dump(a('b')); //结果:'c' </code>
不是很理解你的意思,是指a函数,输入参数:'b',结果就等于'c'么?

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