Too simple too naive Instructions for using the simplexml_load_string function in PHP

First use a piece of code to reproduce the problem
At first glance, the result is very confusing:

Copy the code The code is as follows:

$string = <<< ;data>
hello
world

EOF;
$data = simplexml_load_string($string);
print_r($data);
print_r($data->foo);
?>

At first glance, the result is confusing:

Copy Code The code is as follows:

SimpleXMLElement Object
(
[foo] => Array
(
[0] => SimpleXMLElement Object
(
[bar] => hello
)
[1] => ; SimpleXMLElement Object
(
[bar] => world
)
)
)
SimpleXMLElement Object
(
[bar] => hello
)

Obviously print_r shows that foo is an array with two bar elements , but in the end only one bar element is displayed!
The reason is actually very simple. In the result of simplexml_load_string shown above, foo is not an array, but an iterable object!
You can confirm like this:

Copy the code The code is as follows:

foreach ($data->foo as $v) print_r($v);
foreach ($data->children() as $ v) print_r($v);

It seems that the appearance of print_r or var_dump is not completely trustworthy, so please pay more attention to it.

The above introduces the instructions for using the simplexml_load_string function in too simple too naive PHP, including the content of too simple too naive. I hope it will be helpful to friends who are interested in PHP tutorials.