The "5416" in the search query likely refers to an internal bug tracking ID, a specific exploit script naming (e.g., 5416.py ), or a fork of a metasploit module. GitHub search history shows that early PoC scripts often used "5416" as a shorthand version number.
PHP 5.4.16 is an extremely outdated version of PHP (released in 2013) that is no longer supported and contains multiple critical vulnerabilities. Searching for an "exploit github" typically leads to Proof-of-Concept (PoC) scripts for various CVEs affecting this specific version. Key Vulnerabilities for PHP 5.4.16
Sending a SOAP request to a target application that points the SoapClient to a malicious remote WSDL file.
The most notorious vulnerability affecting PHP 5.4.x is the CGI argument injection flaw. While PHP 5.4.16 was released after the initial fix for CVE-2012-1823