ArrayObject
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ArrayObject::offsetUnset

(PHP 5 >= 5.0.0)

ArrayObject::offsetUnset — Unsets the value at the specified index

说明

public void ArrayObject::offsetUnset ( mixed $index )

Unsets the value at the specified index.

参数

index

The index being unset.

返回值

没有返回值。

范例

Example #1 ArrayObject::offsetUnset() example

<?php
$arrayobj = new ArrayObject(array(0=>'zero',2=>'two'));
$arrayobj->offsetUnset(2);
var_dump($arrayobj);
?>

以上例程会输出：

object(ArrayObject)#1 (1) {
  [0]=>
  string(4) "zero"
}

ArrayObject
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PHP手册
PHP手册 - N: Unsets the value at the specified index

用户评论:

pvenakis at efront dot gr (10-Jan-2008 08:57)

When traversing recursively nested arrays using an RecursiveIteratorIterator, you cannot offsetUnset() or offsetSet() sub-array values, unless they are *all* declared as ArrayObject.

oalexandrino at yahoo dot com dot br (28-May-2007 07:11)

Be careful when you are working with collections. This method works with the reference of an array instead of its retrieved value.

So, you can do a mistake.

In order to understand have a look at code as follow:

<?php
class Employee
{
    public function __construct()
    {
    }   
}

class Company
{
    private $arrEmployee;
   
    public function __construct()
    {
    }   
   
    public function AddEmployee(Employee $oEmployee)
    {
        $this->arrEmployee[] = $oEmployee;   
   
    }
   
    public function getEmployeeList()
    {
        return $this->arrEmployee;
           
    }
   
}
?>

<?php

// first, creates the Company object
$oCompany = new Company();

// second, add 10 elements in
foreach( range(0, 9) as $index )
{
    $oCompany->AddEmployee( new Employee() );
}

// get them
$arrEmployee = $oCompany->getEmployeeList();

// creates an ArrayObject from "$arrEmployee"
$arrayobject = new ArrayObject($arrEmployee);

// unsets its firt five elements
foreach( range(0, 4) as $index )
{
    $arrayobject->offsetUnset($index);
}

// get them again
$arrEmployee = $oCompany->getEmployeeList();

// it shows just 5 elements, they were removed as reference via "offsetUnset" method
print_r($arrEmployee) ;

?>