PHP has provided various built-in wrappers and protocols for a while, but PHP5 adds a few extras.
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Let’s take a look at the new functionality that PHP5 adds for working with strings.
PHP5 adds a bit to its error model, plus adds a completely new model for exceptions.
PHP5 only has a few new functions relating to graphics, but they’re useful ones.
PHP5 has added some new interfaces for MySQL.