1.2.971. Php 8.0 Variable Syntax Tweaks¶
Several variable syntaxes are added in version 8.0. They extends the PHP 7.0 syntax updates, and fix a number of edges cases.
In particular, new``and ``instanceof now support a way to inline the expression, rather than use a temporary variable.
Magic constants are now accessible with array notation, just like another constant. It is also possible to use method calls : although this is Syntacticly correct for PHP, this won’t be executed, as the left operand is a string, and not an object.
<?php
// array name is dynamically build
echo "foo$bar"[0];
// static method
"foo$bar"::baz();
// static property
"foo$bar"::$baz;
// Syntactly correct, but not executable
"foo$bar"->baz();
// expressions with instanceof and new
$object = new ("class_".$name);
$x instanceof ("class_$name");
// PHP 7.0 style
$className = "class_".$name;
$object = new $className;
?>
See also PHP RFC: Variable Syntax Tweaks and scalar_objects in PHP.
1.2.971.1. Specs¶
Short name |
Php/Php80VariableSyntax |
Rulesets |
|
Exakat since |
2.0.8 |
PHP Version |
With PHP 8.0 and more recent |
Severity |
Major |
Time To Fix |
Quick (30 mins) |
Precision |
Very high |
Features |
variable |
Available in |