[PHP] 创建函数别名

/**
 *
 * Function Name :
 *     val2str
 *     参考:http://www.php.net/manual/en/function.create-function.php#103080
 *
 * Description :
 *     将变量值变成php代码
 *
 * Parameters :
 *     $mixed[mixed] : 变量值
 *
 * Returns :
 *     [string]php代码
 *
 * Demo :
 *     $object = new stdClass;
 *     $object->arg = 'object';
 *     echo val2str($object);
 *
 *     $cls = new stdClass();
 *     $cls->key ='value';
 *     $array = (array)$cls;
 *     echo val2str($array);
 *     
 *     $temp = array(
 *         'int' => 100,
 *         'double' => 3.14,
 *         'string' => 'string test',
 *         'array' => array('test21' => 'ok21', 'test22' => 'ok22'),
 *         'object' => (object)array('test31' => 'ok31', 'test32' => 'ok32'),
 *         'bool' => true,
 *         'null' => NULL,
 *     );
 *     eval(sprintf('$test=%1$s;', val2str($temp)));
 *     print_r($test);
 */
function val2str($mixed) {
    // 获取变量名
    $var_name = '';
    
    // 获取变量值
    switch(gettype($mixed)) {
        case 'string':
            return sprintf('\'%1$s\'', $mixed);case 'object':
        case 'array':
            $isobject = false;
            if(is_object($mixed)) {
                $isobject = true;
                $mixed = get_object_vars($mixed);
            }
            
            $delimiter = ', ';
            $out = '';
            foreach($mixed as $key => $value) {
                $fun = __FUNCTION__;
                $out .= sprintf('%1$s\'%2$s\' => %3$s', $delimiter, $key, $fun($value));
            }
            if(!empty($out)) {
                // 删除前面的$delimiter
                $out = substr($out, strlen($delimiter));
            }
            $out = $isobject ? sprintf('(object)array(%1$s)', $out) : sprintf('array(%1$s)', $out);
            return $out;
        
        case 'boolean':
            return $mixed ? 'true' : 'false';
        
        case 'NULL':
            return 'NULL';
        
        //case 'integer':
        //case 'double':
        //case 'resource':
        default :
            return $mixed;
    }
}
/**
 *
 * Function Name :
 *     CreateFunctionAlias
 *     参考:http://www.php.net/manual/en/function.create-function.php#103080
 *
 * Description :
 *     创建函数别名
 *
 * Parameters :
 *     $function_name[string] : 函数名(必须已存在)
 *     $alias_name[string] : 新别名(必须不存在)
 *
 * Returns :
 *     [bool]返回结果
 *
 */
function CreateFunctionAlias($function_name, $alias_name)
{ 
    if(function_exists($alias_name)) 
        return false; 
    $rf = new ReflectionFunction($function_name); 
    $fproto = $alias_name.'('; 
    $fcall = $function_name.'('; 
    $need_comma = false; 
    
    foreach($rf->getParameters() as $param) 
    {
        if($need_comma) 
        { 
            $fproto .= ','; 
            $fcall .= ','; 
        } 

        $fproto .= '$'.$param->getName(); 
        $fcall .= '$'.$param->getName(); 

        if($param->isOptional() && $param->isDefaultValueAvailable()) 
        { 
            $val = $param->getDefaultValue();
            $fproto .= ' = '.val2str($val);
        } 
        $need_comma = true; 
    } 
    $fproto .= ')'; 
    $fcall .= ')'; 

    $f = sprintf('function %1$s{return %2$s;}', $fproto, $fcall);
    eval($f);
    
    return true; 
}
// 创建CreateFunctionAlias别名
if(!function_exists('function_alias')) {
    function function_alias($function_name, $alias_name)  {
        return CreateFunctionAlias($function_name, $alias_name) ;
    }
}