1. Some new Key words Given Below, are added in PHP5.0
• Exception
• Final
• Interface
• Implements
• Abstract
• Public
• Private
• Protected
• Clone
• Try
• Catch
• Throw
• Php_User_Filter

2. In Strrpos() and Strripos(), We can use the entire string as the needle.

3. When calling string offsets while we there is only string without offset, it causes E_ERROR instead of E_WARNING where it happens in older versions.

4. The array_merge() was to accept only arrays rather than in older versions. If a non-array variable is passed, a E_WARNING will be shown for every such parameter.

5. The T_ML_COMMENT constant is no longer defined by the Tokenizer extension. If error_reporting is set to E_ALL, PHP will generate a notice. Although the T_ML_COMMENT was never used at all, it was defined in PHP 4. In both PHP 4 and PHP 5 // and /* */ are resolved as the T_COMMENT constant.

6. The PHPDoc style comments /** */, are parsed by PHP, are recognized as T_DOC_COMMENT.

7. When using the interfaces, classes must be declared before we define the class in Php5. But we are not using the interface in older version.

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J.Vijayanand