update : 2015.11.03
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This method checks whether a key is part of the hash
QuickHashIntStringHash
PHP Manual

QuickHashIntStringHash::exists

(PECL quickhash >= Unknown)

QuickHashIntStringHash::exists — This method checks whether a key is part of the hash

설명

public bool QuickHashIntStringHash::exists ( int $key )

This method checks whether an entry with the provided key exists in the hash.

인수

key

The key of the entry to check for whether it exists in the hash.

반환값

Returns TRUE when the entry was found, or FALSE when the entry is not found.

QuickHashIntStringHash
PHP Manual