Migrating from PHP 5.0.x to PHP 5.1.x
PHP Manual

Integer values in function parameters

With the advent of PHP 5.0.x, a new parameter parsing API was introduced which is used by a large number of PHP functions. In all versions of PHP between 5.0.x and 5.1.x, the handling of integer values was very strict and would reject non-well formed numeric values when a PHP function expected an integer. These checks have now been relaxed to support non-well formed numeric strings such as " 123" and "123 ", and will no longer fail as they did under PHP 5.0.x. However, to promote code safety and input validation, PHP functions will now emit an E_NOTICE when such strings are passed as integers.


Migrating from PHP 5.0.x to PHP 5.1.x
PHP Manual

copyright  ©  April 20 2014 sean dreilinger url: http://durak.org/sean/pubs/software/php/migration51.integer-parameters.html