ArrayAccess::offsetGet

(PHP 5, PHP 7, PHP 8)

ArrayAccess::offsetGetOffset to retrieve

Descrierea

abstract public ArrayAccess::offsetGet ( mixed $offset ) : mixed

Returns the value at specified offset.

This method is executed when checking if offset is empty().

Parametri

offset

The offset to retrieve.

Note

Notă:

It's possible for implementations of this method to return by reference. This makes indirect modifications to the overloaded array dimensions of ArrayAccess objects possible.

A direct modification is one that replaces completely the value of the array dimension, as in $obj[6] = 7. An indirect modification, on the other hand, only changes part of the dimension, or attempts to assign the dimension by reference to another variable, as in $obj[6][7] = 7 or $var =& $obj[6]. Increments with ++ and decrements with -- are also implemented in a way that requires indirect modification.

While direct modification triggers a call to ArrayAccess::offsetSet(), indirect modification triggers a call to ArrayAccess::offsetGet(). In that case, the implementation of ArrayAccess::offsetGet() must be able to return by reference, otherwise an E_NOTICE message is raised.

Valorile întoarse

Can return all value types.

A se vedea și

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User Contributed Notes 1 note

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Martin Q
4 years ago
As of PHP 7, offsetExists($offset) must return a TRUE value in order for offsetGet($offset) to be called, otherwise offsetGet($offset) will just return NULL.  This was not the case in PHP 5, so if your code suddenly stops working upon upgrade to PHP 7, make sure offsetExists() returns sensible values.
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