php - 使用 PHP 引用数组中的字段

Question

这是一个非常简单的问题，我正在努力解决。我有一个变量 ($foo)，它是一个从 sql 调用创建的数组。

当我在代码中引用一个字段时，有什么区别

$foo['bar']和$foo->bar？

Answer 1

$foo['bar']

references an element with the key 'bar' in an array assigned to the variable $foo, as retrieved by mysql_fetch_array()

$foo->bar 

references the property called 'bar' in an object instance in the variable $foo, as retrieved by mysql_fetch_object()

Answer 2

The difference is the mysqli_fetch_* method you use.

• mysqli_fetch_object -> $foo->bar
• mysqli_fetch_assoc -> $foo['bar']
• mysqli_fetch_array -> $foo[0]

'Assoc' stands for 'associated (array)'.

Answer 3

$foo['bar'] is used to access array index this case $foo is an array variable and $foo->bar is used to access class method . in this case $foo is a class object

$foo = new StdClass();
$foo->bar = "Anything";

or

$foo['bar'] = "dfgdfG";