Maximum Line Length

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Reference Material

PHP Manual
Zend Framework
Smarty Template Engine
PEAR Manual

The maximum line length, including tags, attributes, and indentation, is not to exceed 100 characters. There is only one exception to this rule: attribute and value pairs are allowed to exceed the 100 chars as they are not allowed to be separated.

Zend Framework

Zend Framework Documentation Standard

Documentation File Formatting:

XML Tags
Maximum Line Length
Indentation
Line Termination
Empty tags
Usage of whitespace within documents
Program Listings
Notes on specific inline tags
Notes on specific block tags