这在 PHP 中是什么意思 -> 或 =>
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What Does This Mean in PHP -> or =>
提问by Willy Keatinge
Possible Duplicate:
where we use object operator “->” in php
Reference - What does this symbol mean in PHP?
I see these in PHP all the time but I don't have a clue as to what they actually mean. What does ->do and what does =>do. And I'm not talking about the operators. They're something else, but nobody seems to know...
我一直在 PHP 中看到这些，但我不知道它们的实际含义。做->什么和做=>什么。我不是在谈论运营商。他们是别的东西，但似乎没有人知道......
回答by zafus_coder
The double arrow operator, =>, is used as an access mechanism for arrays. This means that what is on the left side of it will have a corresponding value of what is on the right side of it in array context. This can be used to set values of any acceptable type into a corresponding index of an array. The index can be associative (string based) or numeric.
的双箭头操作者，=>被用作用于阵列的访问机制。这意味着它左侧的内容将具有数组上下文中右侧内容的相应值。这可用于将任何可接受类型的值设置为数组的相应索引。索引可以是关联的（基于字符串的）或数字的。
$myArray = array(
0 => 'Big',
1 => 'Small',
2 => 'Up',
3 => 'Down'
);
The object operator, ->, is used in object scope to access methods and properties of an object. It's meaning is to say that what is on the right of the operator is a member of the object instantiated into the variable on the left side of the operator. Instantiated is the key term here.
的对象操作者，->被在对象范围内用于访问的方法和对象的属性。意思是说运算符右边的是实例化为运算符左边变量的对象的成员。实例化是这里的关键术语。
// Create a new instance of MyObject into $obj
$obj = new MyObject();
// Set a property in the $obj object called thisProperty
$obj->thisProperty = 'Fred';
// Call a method of the $obj object named getProperty
$obj->getProperty();
回答by DWright
=>is used in associative array key value assignment. Take a look at:
=>用于关联数组键值分配。看一眼：
http://php.net/manual/en/language.types.array.php.
http://php.net/manual/en/language.types.array.php。
->is used to access an object method or property. Example: $obj->method().
->用于访问对象方法或属性。例子：$obj->method()。
回答by Sivagopal Manpragada
->is used to call a method on the object of a class
->用于调用类对象上的方法
=>is used to assign values to the keys of an array
=>用于为数组的键赋值
E.g.:
例如：
$ages = array("Peter"=>32, "Quagmire"=>30, "Joe"=>34, 1=>2);
回答by Samuel Cook
->
->
calls/sets object variables. Ex:
调用/设置对象变量。前任：
$obj = new StdClass;
$obj->foo = 'bar';
var_dump($obj);
=>Sets key/value pairs for arrays. Ex:
=>为数组设置键/值对。前任：
$array = array(
'foo' => 'bar'
);
var_dump($array);
