[英]php tell between function and string
是他們創建存儲字符串和生成字符串的函數的數組的方法嗎?
<?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";
}
將輸出:
calling foo()
calling bar()
有什么方法可以實現數組,以便獲得輸出:
calling foo()
bar
就像是
$data[] = &foo;
$data[] = "bar";
foreach ($data as $element) {
if (is_callable($element) && !is_string($element)) return $element();
else return $element;
}
我不確定為什么會需要它,但是問題是,您執行此操作的方式始終是字符串,如果可調用,則無法區分。 由於數組按創建順序排序,因此如何使用鍵或類似方法:
$data["foo"] = "foo";
$data[] = "bar";
foreach ($data as $key => $element) {
if (is_callable($element) && is_string($key)) {
echo $element()."\n";
} else {
echo $element."\n";
}
}
另一種可能性(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";
}
}
如果您存儲代碼,則可以評估:
$data[] = "echo foo();";
$data[] = "echo 'bar';";
foreach ($data as $element) {
eval($element);
}
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