The same goes for the v5() function which is always supplied a null URL. V4 UUID: 12a940c7-0f3f-46a1-bb5f-bdd602e10654Īs you can see, the calls to v3() always return the same UUID because the same URL parameter, "abc", is always supplied. Here's a simple class illustrating the proper usage (note that if php5-uuid is not installed on your system, each function call will just return false):Įcho "V3 UUID of URL='abc': ".
this is the value that is to be hashed (MD5 for v3, SHA-1 for v5) it may be any string or even null The fourth argument to uuid_make() is: $url
this is a secondary resource created with uuid_create() it is apparently used to generate an internal UUID, which is used as the namespace of the output UUID The third argument to uuid_make() is: $namespace The first two arguments have been demonstrated below and are straightforward, so I'll skip to the as-yet non-described arguments. The uuid_make() function takes two arguments when generating v1 or v4, but four arguments are required when generating v3 or v5.
#V4 uuid generator code#
The php5-uuid functions could definitely use some documentation to clarify how they should be used, but here's what I've gleaned by examining the OSSP source code (found here: ). Here's an example of why:Īs you can see, using it w/ a DB can cause the creation of documents with repeated ID's.
UUIDs generated below validates using OSSP UUID Tool, and output for named-based UUIDs are exactly the same. Given the same namespace and name, the output is always the same. They require a namespace (another valid UUID) and a value (the name). The following class generates VALID RFC 4211 COMPLIANT Universally Unique IDentifiers (UUID) version 3, 4 and 5.
#V4 uuid generator archive#
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