是一种创建数组的方法,该数组存储生成字符串的字符串和函数吗?
<?php
function foo()
{
return "calling foo()";
}
function bar()
{
return "callin bar()";
}
$data = array();
$data[] = "foo";
$data[] = "bar";
foreach ($data as $element) {
if (is_callable($element)) echo $element()."\n";
else echo $element."\n";
}
将输出:
calling foo()
calling bar()
有没有办法实现数组,以便我得到输出:
calling foo()
bar
类似
$data[] = &foo;
$data[] = "bar";
foreach ($data as $element) {
if (is_callable($element) && !is_string($element)) return $element();
else return $element;
}
答案 0 :(得分:1)
我不确定你为什么需要这个,但问题是你做它的方式总是字符串,如果它们是可调用的,就没有办法区分。如何使用键或类似的东西,因为数组按创建顺序排序:
$data["foo"] = "foo";
$data[] = "bar";
foreach ($data as $key => $element) {
if (is_callable($element) && is_string($key)) {
echo $element()."\n";
} else {
echo $element."\n";
}
}
另一种可能性(有很多):
$data[]['fnc'] = "foo";
$data[]['str'] = "bar";
foreach ($data as $element) {
if (isset($element['fnc']) && is_callable($element['fnc'])) {
$element = $element['fnc'];
echo $element()."\n";
} else {
echo $element['str']."\n";
}
}
如果你存储代码,你可以评估:
$data[] = "echo foo();";
$data[] = "echo 'bar';";
foreach ($data as $element) {
eval($element);
}