PHP SplObjectStorage removeAllExcept()用法及代码示例

SplObjectStorage::removeAllExcept()函数是PHP中的一个内置函数，用于从存储中删除所有对象，但另一个存储所包含的对象除外。

用法:

int SplObjectStorage::removeAllExcept()

参数：该函数接受单个参数$obj，该参数指定要保留的对象存储。

返回值：该函数不返回任何值。

以下示例程序旨在说明PHP中的SplObjectStorage::removeAllExcept()函数：

程序1:

<?php 
  
$obj1 = new StdClass; 
$obj2 = new StdClass; 
$obj3 = new StdClass; 
  
$gfg1 = new SplObjectStorage(); 
$gfg1[$obj1] = "Geeks"; 
  
$gfg2 = new SplObjectStorage(); 
$gfg2[$obj1] = "GFG"; 
$gfg2[$obj2] = "GeeksClasses"; 
$gfg2[$obj3] = "SUDO"; 
  
// Count all existing objects 
var_dump(count($gfg2)); 
  
// Remove all objects of $gfg2 from $gfg2 
$gfg2->removeAllExcept($gfg1); 
  
// Print result after removeAll 
var_dump(count($gfg2)); 
?>

输出：

int(3)
int(1)

程序2:

<?php 
  
$obj1 = new StdClass; 
$obj2 = new StdClass; 
  
$gfg1 = new SplObjectStorage(); 
$gfg1[$obj1] = "Geeks"; 
  
$gfg2 = new SplObjectStorage(); 
$gfg2[$obj1] = "GFG"; 
$gfg2[$obj2] = "GeeksClasses"; 
  
// Count and print all existing objects 
var_dump(count($gfg2)); 
  
// Remove all objects of $gfg1 from $gfg2 
$gfg2->removeAllExcept($gfg1); 
  
// Print result   
var_dump(count($gfg2)); 
  
// Result remains same 
$gfg2->removeAllExcept($gfg2); 
  
// Print result   
var_dump(count($gfg2)); 
  
?>

输出：

int(2)
int(1)
int(1)

参考： https://www.php.net/manual/en/splobjectstorage.removeallexcept.php

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注：本文由纯净天空筛选整理自R_Raj大神的英文原创作品 PHP | SplObjectStorage removeAllExcept() Function。非经特殊声明，原始代码版权归原作者所有，本译文未经允许或授权，请勿转载或复制。