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PHP SplObjectStorage removeAllExcept () function

Syntax:
int SplObjectStorage::removeAllExcept()
Parameters:This the function takes one parameter, $obj,which specifies the storage for the object to save.Return value:This function does not return any value.The programs below illustrate the function SplObjectStorage::removeAllExcept()in PHP:Program 1: $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 $gfg2 objects from $gfg2 $gfg2 -> removeAllExcept ( $gfg1 );  
// Print the result after removeAll var_dump ( count ( $gfg2 )); ?>
Exit:
int (3 ) int (1)
Program 2: $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 $gfg1 objects from $gfg2 $gfg2 -> removeAllExcept ( $gfg1 );  
// Print the result var_dump ( count ( $gfg2 ));  
// The result remains the same $gfg2 -> removeAllExcept ( $gfg2 );  
// Print the result var_dump ( count ( $gfg2 ));  
?>
Exit:
int (2 ) int (1) int (1)
Link: https : //www.php.net/manual/en/splobjectstorage.removeallexcept.php

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