(PECL quickhash >= Unknown)
QuickHashIntSet::add — This method adds a new entry to the set
$key): bool
This method adds a new entry to the set, and returns whether the entry was
added. Entries are by default always added unless
QuickHashIntSet::CHECK_FOR_DUPES has been passed when the set was created.
keyThe key of the entry to add.
true when the entry was added, and false if the entry was not added.
示例 #1 QuickHashIntSet::add() example
<?php
echo "without dupe checking\n";
$set = new QuickHashIntSet( 1024 );
var_dump( $set->exists( 4 ) );
var_dump( $set->add( 4 ) );
var_dump( $set->exists( 4 ) );
var_dump( $set->add( 4 ) );
echo "\nwith dupe checking\n";
$set = new QuickHashIntSet( 1024, QuickHashIntSet::CHECK_FOR_DUPES );
var_dump( $set->exists( 4 ) );
var_dump( $set->add( 4 ) );
var_dump( $set->exists( 4 ) );
var_dump( $set->add( 4 ) );
?>以上示例的输出类似于：
without dupe checking bool(false) bool(true) bool(true) bool(true) with dupe checking bool(false) bool(true) bool(true) bool(false)