php5-dbg 5.6.4+dfsg-4ubuntu3 (amd64 binary) in ubuntu vivid

 This package provides the debug symbols for PHP5 needed for properly
 debugging errors in PHP5 with gdb.
 .
 PHP (recursive acronym for PHP: Hypertext Preprocessor) is a widely-used
 open source general-purpose scripting language that is especially suited
 for web development and can be embedded into HTML.