With PHP 7.0, classes, functions, and constants may be grouped under the same use statement even when imported from the same namespace. Grouping allowed in ‘use’ statement for Aliasing Namespacesīefore PHP 7.0, each class, function, and constant imported from the same namespace had to be specified with a separate use statement. If you run the script, a UTF-8 string ĤĒĻĻŌ will be printed out. Copy the following listing to the script: To experiment with the Unicode codepoint escape syntax, create a script unicode.php. For example, Ē is represented with U+0112 in Unicode, where the leading 0 may be omitted. PHP 7.0 has added support for Unicode codepoint escape syntax, which takes an hexadecimal form and returns the corresponding UTF-8 encoded form. Unicode codepoint Conversion from Hexadecimal Form to UTF-8 If you run the script, you will get the following comparison results: 0 To demonstrate this, create a script compare.php to compare integer, floating-point and string values: 1 PHP’s type comparison rules are used for performing the comparison. If you instead run the script supplying a request parameter, say name=JohnSmith, all examples will output the request parameter received in $_GET: Hello JohnSmithĪ new comparison operator () has been added to PHP 7.0 which returns -1 if the first expression is less than the second, 0 if the two expressions are the same, and 1 if the first expression is greater than the second. If you run the script with no request parameter, all examples will output the last value specified: Hello Deepak Now, create a script ternary.php including all of the following examples: " Null coalescing operators may be chained to return the first defined value: $name = $_GET ? $_POST ? 'Deepak' The preceding example could be rewritten as follows using ?: $name = $_GET ? 'Deepak' Indeed, it will return its first operand if it exists and its value is not NULL, and return the second operand otherwise. The null coalescing operator ( ?), which has been added to PHP 7.0, can be used to streamline this kind of operations. Here, isset returns true if the GET request parameter name is set, in which case variable its value is assigned to variable $name, otherwise $name is set to a constant string value: $name = isset($_GET) ? $_GET : 'Deepak' Įcho "Hello ". Typically you will use the PHP ternary operator with isset as shown in the following example. The isset function can be used to find out if a variable is set and not NULL. In this final article on the series on new features in PHP 7.x, we shall discuss improvements to arrays, operators, constants, and exception handling. In this series of articles, we discuss new features across the various PHP 7.x versions. PHP 7.x brings several improvements and new features that touch all aspects of the language, including better support for object oriented programming, extensions to classes and interfaces, improvements to the type system, error handling, and more. PHP 7.3 adds support for reference assignments in array and list() destructuring.PHP 7.3 introduces flexible Heredoc and Nowdoc syntax for better readability.With PHP 7.0.0, keywords may be used as identifiers.PHP 7 supports specifying multiple exceptions in the same catch block of a try/catch statement.PHP 7.1 adds support for class constant visibility, using which constants may be declared public, protected and private.PHP 7.1, adds a short form array syntax for unpacking or destructuring an array. The use statement may group classes, functions, and constants even when imported from the same namespace.PHP 7.0 adds support for Unicode codepoint escape syntax, to convert an hexadecimal form to the corresponding UTF-8 encoded form.PHP 7.0 adds a new comparison operator () to compare expressions.PHP 7.4 adds support for null coalescing assignments. PHP 7.0 adds the null coalescing operator (?) to return the first operand if it exists and its value is not NULL, and returns the second operand otherwise.
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