ExpressionFunction

class ExpressionFunction

Represents a function that can be used in an expression.

A function is defined by two PHP callables. The callables are used by the language to compile and/or evaluate the function.

The "compiler" function is used at compilation time and must return a PHP representation of the function call (it receives the function arguments as arguments).

The "evaluator" function is used for expression evaluation and must return the value of the function call based on the values defined for the expression (it receives the values as a first argument and the function arguments as remaining arguments).

Methods

	__construct(string $name, callable $compiler, callable $evaluator)
	getName()
	getCompiler()
	getEvaluator()
static ExpressionFunction	fromPhp(string $phpFunctionName, string\|null $expressionFunctionName = null) Creates an ExpressionFunction from a PHP function name.

Details

__construct(string $name, callable $compiler, callable $evaluator)

Parameters

string	$name	The function name
callable	$compiler	A callable able to compile the function
callable	$evaluator	A callable able to evaluate the function

getName()

getCompiler()

getEvaluator()

static ExpressionFunction fromPhp(string $phpFunctionName, string|null $expressionFunctionName = null)

Creates an ExpressionFunction from a PHP function name.

Parameters

string	$phpFunctionName	The PHP function name
string\|null	$expressionFunctionName	The expression function name (default: same than the PHP function name)

Return Value

ExpressionFunction

Exceptions

InvalidArgumentException	if given PHP function name does not exist
InvalidArgumentException	if given PHP function name is in namespace and expression function name is not defined

© 2004–2017 Fabien Potencier
Licensed under the MIT License.
http://api.symfony.com/4.0/Symfony/Component/ExpressionLanguage/ExpressionFunction.html