<?php
function register_template(){
print_r(func_get_args());
# the result was an array ( [0] => my template [1] => screenshot.png [2] => nice template .. )
}
register_template( # unkown number of arguments
$name = "my template",
$screenshot = "screenshot.png",
$description = "nice template .. "
)
?>
PHP 不支持任意数量的命名参数。你要么在函数声明中决定一组固定数量的参数及其名称，要么只能获取值。
通常的解决方法是使用数组：
function register_template($args) {
// use $args
}
register_template(array('name' => 'my template', ...));
我想做同样的事情，但已经对已经给出的答案不太满意了...
尝试将以下内容添加到您的功能中 ->
$reflector = new ReflectionClass(__CLASS__);
$parameters = $reflector->getMethod(__FUNCTION__)->getParameters();
$args = array();
foreach($parameters as $parameter)
{
$args[$parameter->name] = ${$parameter->name};
}
print_r($args);
我还没有考虑过尝试将这个功能作为自己的函数来实现，但可能可以...
参数名称并不存在。frobnicate($a = "b")不是带参数调用语法，而只是一个赋值后跟随函数调用的技巧，用于代码文档，实际上并未被语言考虑在内。
通常接受的做法是提供一个关联数组形式的参数：frobnicate(array('a' => 'b'))
选项A）
<?php
function registerTemplateA() {
// loop over every variable defined in the global scope,
// such as those you created there when calling this function
foreach($GLOBALS as $potentialKey => $potentialValue) {
$valueArgs = func_get_args();
if (in_array($potentialValue, $valueArgs)) {
// this variable seems to match a _value_ you passed in
$args[$potentialKey] = $potentialValue;
}
}
// you now have an associative array in $args
print_r($args);
}
registerTemplateA($name = "my template", $screenshot = "screenshot.png", $description = "nice template");
?>
<?php
function registerTemplateB() {
// passing in keys as args this time so we don't need to access global scope
for ($i = 0; $i < func_num_args(); $i++) {
// run following code on even args
// (the even args are numbered as odd since it counts from zero)
// `% 2` is a modulus operation (calculating remainder when dividing by 2)
if ($i % 2 != 0) {
$key = func_get_arg($i - 1);
$value = func_get_arg($i);
// join odd and even args together as key/value pairs
$args[$key] = $value;
}
}
// you now have an associative array in $args
print_r($args);
}
registerTemplateB('name', 'my template', 'screenshot', 'screenshot.png', 'description', 'nice template');
?>
<?php
function registerTemplateC($args) {
// you now have an associative array in $args
print_r($args);
}
registerTemplateC(array('name' => 'my template', 'screenshot' => 'screenshot.png', 'description' => 'nice template'));
?>
很简单。只需将数组作为参数传递，然后在函数内部以$key => $value的形式访问即可。
这是我能想到的最好的方法。
$vars = array("var1","var2"); //define the variable one extra time here
$$vars[0] = 'value1'; // or use $var1
$$vars[1] = 'value2'; // or use $var2
function myfunction() {
global $vars;
$fVars = func_get_args();
foreach($fVars as $key=>$value) {
$fvars[$vars[$key]] = $value;
unset($fvar[$key]);
}
//now you have what you want var1=> value1
}
myfunction(array($$vars[0],$$vars[1]));
我还没有测试过...顺便说一下。但是你应该明白要点。
function test($a,$b,$c){
// result map nameParam=>value
$inMapParameters=[];
//get values of parameters
$fnValueParameters=func_get_args();
$method = new \ReflectionMethod($this, 'test');
foreach ($method->getParameters() as $index=>$param) {
$name = $param->getName();
if($fnValueParameters[$index]==null){continue;}
$inMapParameters["$name"]=$fnValueParameters[$index];
}
}
class MyAwesomeClass
{
public static function apple($kind, $weight, $color = 'green')
{
$args = self::funcGetNamedParams();
print_r($args);
}
private static function funcGetNamedParams() {
$func = debug_backtrace()[1]['function'];
$args = debug_backtrace()[1]['args'];
$reflector = new \ReflectionClass(__CLASS__);
$params = [];
foreach($reflector->getMethod($func)->getParameters() as $k => $parameter){
$params[$parameter->name] = isset($args[$k]) ? $args[$k] : $parameter->getDefaultValue();
}
return $params;
}
}
让我们来测试一下！
MyAwesomeClass::apple('Granny Smith', 250);
输出：
Array
(
[kind] => Granny Smith
[weight] => 250
[color] => green
)
例如：
<?php
function asd($q, $w, $rer){
$test = '23ew';
var_dump(get_defined_vars());
}
asd("qweqwe", 'ewrq', '43ewdsa');
?>
array(4) {
["q"]=>
string(6) "qweqwe"
["w"]=>
string(4) "ewrq"
["rer"]=>
string(7) "43ewdsa"
["test"]=>
string(4) "23ew"
}
不行，参数只能按位置传递。或许你可以发送一个数组？
<?php
function register_template(array $parameters) {
var_dump($parameters);
}
register_template(# unkown number of arguments
$name = "my template",
$screenshot = "screenshot.png",
$description = "nice template .. "
)
?>
使用
function register_template($args){
print_r ( $args ); // array (['name'] => 'my template' ...
extract ($args);
print $name; // my template
print $screenshot;
}
register_templete ( array (
"name" => "my template",
"screenshot" => "screenshot.png",
"description" => "nice template.."
));